// license:BSD-3-Clause
// copyright-holders:Vas Crabb
/***************************************************************************
strformat.h
type-safe printf substitutes
This header provides type-safe printf substitutes that output to
std::ostream- or std::string-like objects. Most format strings
supported by C99, SUS, glibc and MSVCRT are accepted. Not all
features are implemented, and semantics differ in some cases. Any
object with an appropriate stream output operator can be used as
a format argument with the %s conversion.
Since the functions are implemented using C++ iostream, some
behaviour more closely resembles iostream output operator behaviour
than printf behaviour. You are also exposed to bugs in your C++
iostream implementation (e.g. hexadecimal scientific format doesn't
work properly on MinGW).
These functions are designed to be forgiving - using an
inappropriate conversion for an argument's type just results in the
default conversion for the type being used. Inappropriate types or
out-of-range positions for parameterised field width and precision
are treated as if no width/precision was specified. Out-of-range
argument positions result in the format specification being printed.
Position specifiers for arguments (%123$), field width (*456$) and
precision (.*789$) are supported. Mixing explicit and implied
positions for arguments/widths/precisions is discouraged, although
it does produce deterministic behaviour.
The following format flags are recognised:
- "#": alternate format - sets showbase/showpoint, and also
boolalpha for bool with s conversion
- "0": pad with zeroes rather than spaces, ignored if '-' flag is
specified or if precision is specified for d/i/u/o/x/X
conversion
- "-": left-align output, overrides '0'
- " ": recognised but not implemented, ignored for u/o/x/X
conversion
- "+": show sign for positive numbers, overrides ' ', ignored for
u/o/x/X conversions
- "'": recognised for SUS compatibility but ignored (digit grouping
is controlled by stream locale)
- "I": recognised for glibc compatibility but ignored (digits are
controlled by stream locale)
Precision is supported for conversions by setting precision on the
stream. This works as expected for a/A/e/E/f/F/g/G conversions on
floating-point types, and may work for objects with user-defined
stream output operators. Precision for d/i/u/o/x/X conversions
(minimum digits to print) is not supported. Precision for s
conversions (maximum characters to print) is only honoured for
string-like types (output character pointer/array and
std::basic_string).
Length specifiers are supported but not required for d/i/u/o/x/X
conversions with integer/char/bool arguments. They result in the
value being cast to the desired type before being printed. Length
specifiers are ignored for other conversions.
The following length specifiers are recognised:
- hh: cast to char/unsigned char for d/i/u/o/x/X
- h: cast to short/unsigned short for d/i/u/o/x/X
- l: cast to long/unsigned long for d/i/u/o/x/X
- ll: cast to long long/unsigned long long for d/i/u/o/x/X
- L: always ignored
- j: cast to intmax_t/uintmax_t for d/i/u/o/x/X
- z: cast to ssize_t/size_t for d/i/u/o/x/X
- t: cast to ptrdiff_t for d/i/u/o/x/X
- I: cast to ssize_t/size_t for d/i/u/o/x/X
- I32: cast to int32_t/uint32_t for d/i/u/o/x/X
- I64: cast to int64_t/uint64_t for d/i/u/o/x/X
- w: always ignored
The following conversions are recognised:
- d/i: signed decimal for integer/char/bool types
- u: unsigned decimal for integer/char/bool types
- o: unsigned octal for integer/char/bool types
- x/X: lower/uppercase unsigned hexadecimal for integer/char/bool
types or scientific hexadecimal for floating-point types
- e/E: lower/uppercase scientific decimal for floating-point types
- f/F: lower/uppercase fixed-point decimal for floating-point types
- g/G: default stream output format for floating-point types (may
differ from printf behaviour)
- a/A: lower/uppercase scientific hexadecimal for floating-point
types or hexadecimal for integer types
- c/C: cast integer types to stream's character type, no automatic
widening or narrowing
- s/S: default stream output behaviour for argument
- p/P: cast any integer/char/bool/pointer/array to void const *
- n: store characters printed so far, produces no output, argument
must be pointer to type that std::streamoff is convertible to
- m: output of std::strerror(errno), no automatic widening or
narrowing, does not consume an argument
- %: literal %, field width applied, does not consume an argument
The output stream type for stream_format must be equivalent to a
std::basic_ostream for duck-typing purposes. The output string for
string type for string_format must provide value_type, traits_type
and allocator_type declarations, and must be constructible from a
std::basic_string using the same value, traits and allocator types.
The format string type can be a pointer to a NUL-terminated string,
an array containing a NUL-terminated or non-terminated string, or a
STL contiguous container holding a string (e.g. std::string,
std::vector or std::array). Note that NUL characters characters are
only treated as terminators for pointers and arrays, they are
treated as normal characters for other containers. A non-contiguous
container (e.g. std::list or std::deque) will result in undesirable
behaviour likely culminating in a crash.
The value type of the format string and the character type of the
output stream/string need to match. You can't use a wchar_t format
to format char output and vice versa.
The format string encoding must have contiguous decimal digits. The
character encoding must not use shift states or multi-byte sequences
that could result in a format character codepoint appearing as part
of a multi-byte sequence or being interpreted differently. ASCII,
ISO Latin, KOI-8, UTF-8, EUC, EBCDIC, and UTF-EBCDIC encodings meet
these requirements, while ISO-2022, UTF-7, KOI-7 and Shift-JIS
encodings do not. For character types other than char and wchar_t,
the encoding must be a strict superset of the char encoding.
The following conditions cause assertion failures in debug builds:
- Unsupported conversion specifier
- Out-of-range argument/width/precision position
- Inappropriate type for parameterised width/precision
- Positional width/precision specifier not terminated with $
- Inappropriate type for n conversion
Some limitations have been described in passing. Major limitations
and bugs include:
- No automatic widening/narrowing support, so no simple way to
output wide characters/strings to narrow streams/strings and vice
versa.
- Precision ignored for d/i/u/o/x/X conversions (should set minimum
digits to print).
- Precision for s/S conversion is only honoured for string-like
types (output character pointer/array and std::basic_string).
- If the output character type is not char, signed char or unsgined
char, printing the a value of this type with d/i/u/o/x/X
conversion and no length specifier causes it to be printed as a
character. Can be worked around by casting to another integer
type or using length specifier.
- Printing with d/i/u/o/x/X conversions may not behave as expected
if the output character type is an integer type other than char,
signed char, unsigned char, or wchar_t.
- Only output character pointer/array is treated as a C string, any
other pointer/array will be printed as a pointer value. The
signed/unsigned/default char are not handled equivalently.
- There is no length specifier to force cast to int/unsigned. Can
be worked around by casting the argument.
- MSVCRT length specifiers I/I32/I64 will not be recognised if no
width or precision is specified, as they will be mistaken for
glibc alternate digits flag.
- The " " flag to prefix positive numbers with a space is not
implemented.
- The "'" and "I" flags are not implemented, as digit grouping and
characters are controlled by the output stream's locale.
- The characters used for space- and zero-padding are not locale-
aware.
***************************************************************************/
#ifndef MAME_UTIL_STRFORMAT_H
#define MAME_UTIL_STRFORMAT_H
#pragma once
#include "vecstream.h"
#include <algorithm>
#include <array>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <iterator>
#include <limits>
#include <locale>
#include <sstream>
#include <string>
#include <type_traits>
#include <utility>
#if defined(__GLIBCXX__)
namespace std {
namespace mame_cxx14_compat {
template <typename T>
inline constexpr auto cbegin(const T& cont) noexcept(noexcept(std::begin(cont))) -> decltype(std::begin(cont))
{ return std::begin(cont); }
template <typename T>
inline constexpr auto cend(const T& cont) noexcept(noexcept(std::end(cont))) -> decltype(std::end(cont))
{ return std::end(cont); }
}
using namespace mame_cxx14_compat;
}
#endif
namespace util {
namespace detail {
//**************************************************************************
// FORMAT CHARACTER DEFINITIONS
//**************************************************************************
template <typename Character>
class format_chars
{
public:
typedef Character char_type;
enum : Character {
nul = Character('\0'),
space = Character(' '),
point = Character('.'),
percent = Character('%'),
dollar = Character('$'),
hash = Character('#'),
minus = Character('-'),
plus = Character('+'),
asterisk = Character('*'),
quote = Character('\''),
zero = Character('0'),
nine = Character('9'),
a = Character('a'),
A = Character('A'),
c = Character('c'),
C = Character('C'),
d = Character('d'),
e = Character('e'),
E = Character('E'),
f = Character('f'),
F = Character('F'),
g = Character('g'),
G = Character('G'),
h = Character('h'),
i = Character('i'),
I = Character('I'),
j = Character('j'),
l = Character('l'),
L = Character('L'),
m = Character('m'),
n = Character('n'),
o = Character('o'),
p = Character('p'),
s = Character('s'),
S = Character('S'),
t = Character('t'),
u = Character('u'),
w = Character('w'),
x = Character('x'),
X = Character('X'),
z = Character('z')
};
};
template <>
class format_chars<wchar_t>
{
public:
typedef wchar_t char_type;
enum : wchar_t {
nul = L'\0',
space = L' ',
point = L'.',
percent = L'%',
dollar = L'$',
hash = L'#',
minus = L'-',
plus = L'+',
asterisk = L'*',
quote = L'\'',
zero = L'0',
nine = L'9',
a = L'a',
A = L'A',
c = L'c',
C = L'C',
d = L'd',
e = L'e',
E = L'E',
f = L'f',
F = L'F',
g = L'g',
G = L'G',
h = L'h',
i = L'i',
I = L'I',
j = L'j',
l = L'l',
L = L'L',
m = L'm',
n = L'n',
o = L'o',
p = L'p',
s = L's',
S = L'S',
t = L't',
u = L'u',
w = L'w',
x = L'x',
X = L'X',
z = L'z'
};
};
//**************************************************************************
// FORMAT SPECIFIER ENCAPSULATION
//**************************************************************************
class format_flags
{
public:
enum class positive_sign {
none,
space, // ' '
plus // +
};
enum class length {
unspecified,
character, // hh
short_integer, // h
long_integer, // l
long_long_integer, // ll
long_double, // L
integer_maximum, // j
size_type, // z, I
pointer_difference, // t
integer_32, // I32
integer_64, // I64
wide_character // w
};
enum class conversion {
unspecified,
signed_decimal, // i, d
unsigned_decimal, // u
octal, // o
hexadecimal, // x, X
scientific_decimal, // e, E
fixed_decimal, // f, F
floating_decimal, // g, G
scientific_hexadecimal, // a, A
character, // c, C
string, // s, S
pointer, // p
tell, // n
strerror, // m
percent // %
};
format_flags()
: m_alternate_format(false)
, m_zero_pad(false)
, m_left_align(false)
, m_positive_sign(positive_sign::none)
, m_digit_grouping(false)
, m_alternate_digits(false)
, m_field_width(0)
, m_precision(-1)
, m_length(length::unspecified)
, m_uppercase(false)
, m_conversion(conversion::unspecified)
{
}
template <typename Stream> void apply(Stream &stream) const
{
typedef format_chars<typename Stream::char_type> chars;
stream.unsetf(
Stream::basefield |
Stream::adjustfield |
Stream::floatfield |
Stream::boolalpha |
Stream::showbase |
Stream::showpoint |
Stream::showpos |
Stream::uppercase);
if (get_alternate_format()) stream.setf(Stream::showbase | Stream::showpoint);
stream.fill(get_zero_pad() ? chars::zero : chars::space);
stream.setf(get_left_align() ? Stream::left : get_zero_pad() ? Stream::internal : Stream::right);
if (positive_sign::plus == get_positive_sign()) stream.setf(Stream::showpos);
stream.precision((get_precision() < 0) ? 6 : get_precision());
stream.width(get_field_width());
if (get_uppercase()) stream.setf(Stream::uppercase);
switch (get_conversion())
{
case conversion::unspecified:
break;
case conversion::signed_decimal:
case conversion::unsigned_decimal:
stream.setf(Stream::dec);
break;
case conversion::octal:
stream.setf(Stream::oct);
break;
case conversion::hexadecimal:
stream.setf(Stream::hex | Stream::scientific | Stream::fixed);
break;
case conversion::scientific_decimal:
stream.setf(Stream::dec | Stream::scientific);
break;
case conversion::fixed_decimal:
stream.setf(Stream::dec | Stream::fixed);
break;
case conversion::floating_decimal:
stream.setf(Stream::dec);
break;
case conversion::scientific_hexadecimal:
stream.setf(Stream::hex | Stream::scientific | Stream::fixed);
break;
case conversion::character:
case conversion::string:
case conversion::pointer:
case conversion::tell:
case conversion::strerror:
case conversion::percent:
break;
}
}
bool get_alternate_format() const { return m_alternate_format; }
bool get_zero_pad() const { return m_zero_pad; }
bool get_left_align() const { return m_left_align; }
positive_sign get_positive_sign() const { return m_positive_sign; }
bool get_digit_grouping() const { return m_digit_grouping; }
bool get_alternate_digits() const { return m_alternate_digits; }
unsigned get_field_width() const { return m_field_width; }
int get_precision() const { return m_precision; }
length get_length() const { return m_length; }
bool get_uppercase() const { return m_uppercase; }
conversion get_conversion() const { return m_conversion; }
void set_alternate_format()
{
m_alternate_format = true;
}
void set_zero_pad()
{
if (!m_left_align)
{
switch (m_conversion)
{
case conversion::signed_decimal:
case conversion::unsigned_decimal:
case conversion::octal:
case conversion::hexadecimal:
m_zero_pad = (0 > m_precision);
break;
default:
m_zero_pad = true;
}
}
}
void set_left_align()
{
m_zero_pad = false;
m_left_align = true;
}
void set_positive_sign_space()
{
switch (m_conversion)
{
case conversion::unsigned_decimal:
case conversion::octal:
case conversion::hexadecimal:
break;
default:
if (positive_sign::plus != m_positive_sign)
m_positive_sign = positive_sign::space;
}
}
void set_positive_sign_plus()
{
switch (m_conversion)
{
case conversion::unsigned_decimal:
case conversion::octal:
case conversion::hexadecimal:
break;
default:
m_positive_sign = positive_sign::plus;
}
}
void set_digit_grouping()
{
m_digit_grouping = true;
}
void set_alternate_digits()
{
m_alternate_digits = true;
}
void set_field_width(int value)
{
if (0 > value)
{
set_left_align();
m_field_width = unsigned(-value);
}
else
{
m_field_width = unsigned(value);
}
}
void set_precision(int value)
{
m_precision = value;
if (0 <= value)
{
switch (m_conversion)
{
case conversion::signed_decimal:
case conversion::unsigned_decimal:
case conversion::octal:
case conversion::hexadecimal:
m_zero_pad = false;
break;
default:
break;
}
}
}
void set_length(length value)
{
m_length = value;
}
void set_uppercase()
{
m_uppercase = true;
}
void set_conversion(conversion value)
{
m_conversion = value;
switch (value)
{
case conversion::unsigned_decimal:
case conversion::octal:
case conversion::hexadecimal:
m_positive_sign = positive_sign::none;
case conversion::signed_decimal:
if (0 <= m_precision)
m_zero_pad = false;
break;
default:
break;
}
}
private:
bool m_alternate_format; // #
bool m_zero_pad; // 0
bool m_left_align; // -
positive_sign m_positive_sign; // ' ', +
bool m_digit_grouping; // '
bool m_alternate_digits; // I
unsigned m_field_width;
int m_precision; // .
length m_length; // hh, h, l, ll, L, j, z, I, t, w
bool m_uppercase; // X, E, F, G, A
conversion m_conversion; // i, d, u, o, x, X, e, E, f, F, g, G, a, A, c, C, s, S, p, m, %
};
//**************************************************************************
// FORMAT OUTPUT HELPERS
//**************************************************************************
template <typename Stream, typename T>
class format_output
{
private:
template <typename U> struct signed_integer_semantics
{ static constexpr bool value = std::is_integral<U>::value && std::is_signed<U>::value; };
template <typename U> struct unsigned_integer_semantics
{ static constexpr bool value = std::is_integral<U>::value && !std::is_signed<U>::value; };
template <typename U> struct default_semantics
{ static constexpr bool value = !signed_integer_semantics<U>::value && !unsigned_integer_semantics<U>::value; };
public:
template <typename U>
static void apply(std::enable_if_t<signed_integer_semantics<U>::value, Stream> &str, format_flags const &flags, U const &value)
{
switch (flags.get_conversion())
{
case format_flags::conversion::signed_decimal:
switch (flags.get_length())
{
case format_flags::length::character:
str << int(static_cast<signed char>(value));
break;
case format_flags::length::short_integer:
str << short(value);
break;
case format_flags::length::long_integer:
str << long(value);
break;
case format_flags::length::long_long_integer:
str << static_cast<long long>(value);
break;
case format_flags::length::integer_maximum:
str << std::intmax_t(value);
break;
case format_flags::length::size_type:
str << std::make_signed_t<std::size_t>(value);
break;
case format_flags::length::pointer_difference:
str << std::make_signed_t<std::ptrdiff_t>(value);
break;
case format_flags::length::integer_32:
str << std::uint32_t(std::int32_t(value));
break;
case format_flags::length::integer_64:
str << std::int64_t(value);
break;
default:
if (std::is_same<std::make_signed_t<U>, std::make_signed_t<char> >::value)
str << int(value);
else
str << value;
}
break;
case format_flags::conversion::unsigned_decimal:
case format_flags::conversion::octal:
case format_flags::conversion::hexadecimal:
switch (flags.get_length())
{
case format_flags::length::character:
str << unsigned(static_cast<unsigned char>(static_cast<signed char>(value)));
break;
case format_flags::length::short_integer:
str << static_cast<unsigned short>(short(value));
break;
case format_flags::length::long_integer:
str << static_cast<unsigned long>(long(value));
break;
case format_flags::length::long_long_integer:
str << static_cast<unsigned long long>(static_cast<long long>(value));
break;
case format_flags::length::integer_maximum:
str << std::uintmax_t(std::intmax_t(value));
break;
case format_flags::length::size_type:
str << std::make_unsigned_t<std::size_t>(std::make_signed_t<std::size_t>(value));
break;
case format_flags::length::pointer_difference:
str << std::make_unsigned_t<std::ptrdiff_t>(std::make_signed_t<std::ptrdiff_t>(value));
break;
case format_flags::length::integer_32:
str << std::uint32_t(std::int32_t(value));
break;
case format_flags::length::integer_64:
str << std::uint64_t(std::int64_t(value));
break;
default:
if (std::is_same<std::make_unsigned_t<U>, std::make_unsigned_t<char> >::value)
str << unsigned(std::make_unsigned_t<U>(value));
else
str << std::make_unsigned_t<U>(value);
}
break;
case format_flags::conversion::character:
if (std::is_signed<typename Stream::char_type>::value)
str << typename Stream::char_type(value);
else
str << typename Stream::char_type(std::make_signed_t<typename Stream::char_type>(value));
break;
case format_flags::conversion::pointer:
str << reinterpret_cast<void const *>(std::uintptr_t(std::intptr_t(value)));
break;
default:
str << value;
}
}
template <typename U>
static void apply(std::enable_if_t<unsigned_integer_semantics<U>::value, Stream> &str, format_flags const &flags, U const &value)
{
switch (flags.get_conversion())
{
case format_flags::conversion::signed_decimal:
switch (flags.get_length())
{
case format_flags::length::character:
str << int(static_cast<signed char>(static_cast<unsigned char>(value)));
break;
case format_flags::length::short_integer:
str << short(static_cast<unsigned short>(value));
break;
case format_flags::length::long_integer:
str << long(static_cast<unsigned long>(value));
break;
case format_flags::length::long_long_integer:
str << static_cast<long long>(static_cast<unsigned long long>(value));
break;
case format_flags::length::integer_maximum:
str << std::intmax_t(std::uintmax_t(value));
break;
case format_flags::length::size_type:
str << std::make_signed_t<std::size_t>(std::make_unsigned_t<std::size_t>(value));
break;
case format_flags::length::pointer_difference:
str << std::make_signed_t<std::ptrdiff_t>(std::make_unsigned_t<std::ptrdiff_t>(value));
break;
case format_flags::length::integer_32:
str << std::int32_t(std::uint32_t(value));
break;
case format_flags::length::integer_64:
str << std::int64_t(std::uint64_t(value));
break;
default:
if (std::is_same<std::make_signed_t<U>, std::make_signed_t<char> >::value)
str << int(std::make_signed_t<U>(value));
else
str << std::make_signed_t<U>(value);
}
break;
case format_flags::conversion::unsigned_decimal:
case format_flags::conversion::octal:
case format_flags::conversion::hexadecimal:
switch (flags.get_length())
{
case format_flags::length::character:
str << unsigned(static_cast<unsigned char>(value));
break;
case format_flags::length::short_integer:
str << static_cast<unsigned short>(value);
break;
case format_flags::length::long_integer:
str << static_cast<unsigned long>(value);
break;
case format_flags::length::long_long_integer:
str << static_cast<unsigned long long>(value);
break;
case format_flags::length::integer_maximum:
str << std::uintmax_t(value);
break;
case format_flags::length::size_type:
str << std::make_unsigned_t<std::size_t>(value);
break;
case format_flags::length::pointer_difference:
str << std::make_unsigned_t<std::ptrdiff_t>(value);
break;
case format_flags::length::integer_32:
str << std::uint32_t(std::int32_t(value));
break;
case format_flags::length::integer_64:
str << std::int64_t(value);
break;
default:
if (std::is_same<std::make_unsigned_t<U>, std::make_unsigned_t<char> >::value)
str << unsigned(value);
else
str << value;
}
break;
case format_flags::conversion::character:
if (std::is_signed<typename Stream::char_type>::value)
str << typename Stream::char_type(value);
else
str << typename Stream::char_type(std::make_signed_t<typename Stream::char_type>(value));
break;
case format_flags::conversion::pointer:
str << reinterpret_cast<void const *>(std::uintptr_t(value));
break;
default:
str << value;
}
}
template <typename U>
static void apply(std::enable_if_t<default_semantics<U>::value, Stream> &str, format_flags const &flags, U const &value)
{
str << value;
}
static void apply(Stream &str, format_flags const &flags, bool value)
{
switch (flags.get_conversion())
{
case format_flags::conversion::signed_decimal:
case format_flags::conversion::unsigned_decimal:
case format_flags::conversion::octal:
case format_flags::conversion::hexadecimal:
case format_flags::conversion::scientific_decimal:
case format_flags::conversion::fixed_decimal:
case format_flags::conversion::floating_decimal:
case format_flags::conversion::scientific_hexadecimal:
case format_flags::conversion::character:
case format_flags::conversion::pointer:
apply(str, flags, unsigned(value));
break;
default:
if (flags.get_alternate_format()) str.setf(Stream::boolalpha);
str << value;
}
}
template <typename CharT, typename Traits, typename Allocator>
static void apply(std::enable_if_t<std::is_same<CharT, typename Stream::char_type>::value, Stream> &str, format_flags const &flags, std::basic_string<CharT, Traits, Allocator> const &value)
{
int const precision(flags.get_precision());
if ((0 <= precision) && (value.size() > unsigned(precision)))
{
unsigned width(flags.get_field_width());
bool const pad(unsigned(precision) < width);
typename Stream::fmtflags const adjust(str.flags() & Stream::adjustfield);
if (!pad || (Stream::left == adjust)) str.write(&*value.begin(), unsigned(precision));
if (pad)
{
for (width -= precision; 0U < width; --width) str.put(str.fill());
if (Stream::left != adjust) str.write(&*value.begin(), unsigned(precision));
}
str.width(0);
}
else
{
str << value;
}
}
template <typename CharT, typename Traits, typename Allocator>
static void apply(std::enable_if_t<!std::is_same<CharT, typename Stream::char_type>::value, Stream> &str, format_flags const &flags, std::basic_string<CharT, Traits, Allocator> const &value)
{
int const precision(flags.get_precision());
if ((0 <= precision) && (value.size() > unsigned(precision)))
str << value.substr(0, unsigned(precision));
else
str << value;
}
};
template <typename Stream, typename T>
class format_output<Stream, T *>
{
protected:
template <typename U> struct string_semantics
{ static constexpr bool value = std::is_same<std::remove_const_t<U>, typename Stream::char_type>::value; };
public:
template <typename U>
static void apply(std::enable_if_t<string_semantics<U>::value, Stream> &str, format_flags const &flags, U const *value)
{
switch (flags.get_conversion())
{
case format_flags::conversion::string:
{
int precision(flags.get_precision());
if (0 <= flags.get_precision())
{
std::streamsize cnt(0);
for ( ; (0 < precision) && (U(format_chars<U>::nul) != value[cnt]); --precision, ++cnt) { }
unsigned width(flags.get_field_width());
bool const pad(std::make_unsigned_t<std::streamsize>(cnt) < width);
typename Stream::fmtflags const adjust(str.flags() & Stream::adjustfield);
if (!pad || (Stream::left == adjust)) str.write(value, cnt);
if (pad)
{
for (width -= cnt; 0U < width; --width) str.put(str.fill());
if (Stream::left != adjust) str.write(value, cnt);
}
str.width(0);
}
else
{
str << value;
}
}
break;
case format_flags::conversion::pointer:
str << reinterpret_cast<void const *>(const_cast<std::remove_volatile_t<U> *>(value));
break;
default:
str << value;
}
}
template <typename U>
static void apply(std::enable_if_t<!string_semantics<U>::value, Stream> &str, format_flags const &flags, U const *value)
{
str << reinterpret_cast<void const *>(const_cast<std::remove_volatile_t<U> *>(value));
}
};
template <typename Stream, typename T, std::size_t N>
class format_output<Stream, T[N]> : protected format_output<Stream, T *>
{
public:
template <typename U>
static void apply(Stream &str, format_flags const &flags, U const *value)
{
static_assert(
!format_output::template string_semantics<U>::value || (N <= size_t(unsigned((std::numeric_limits<int>::max)()))),
"C string array length must not exceed maximum integer value");
format_flags f(flags);
if (format_output::template string_semantics<U>::value && ((0 > f.get_precision()) || (N < unsigned(f.get_precision()))))
f.set_precision(int(unsigned(N)));
format_output<Stream, T *>::apply(str, f, value);
}
};
//**************************************************************************
// INTEGER INPUT HELPERS
//**************************************************************************
template <typename T>
class format_make_integer
{
private:
template <typename U> struct use_unsigned_cast
{ static constexpr bool value = std::is_convertible<U const, unsigned>::value && std::is_unsigned<U>::value; };
template <typename U> struct use_signed_cast
{ static constexpr bool value = !use_unsigned_cast<U>::value && std::is_convertible<U const, int>::value; };
template <typename U> struct disable
{ static constexpr bool value = !use_unsigned_cast<U>::value && !use_signed_cast<U>::value; };
public:
template <typename U> static std::enable_if_t<use_unsigned_cast<U>::value, bool> apply(U const &value, int &result)
{
result = int(unsigned(value));
return true;
}
template <typename U> static std::enable_if_t<use_signed_cast<U>::value, bool> apply(U const &value, int &result)
{
result = int(value);
return true;
}
template <typename U> static std::enable_if_t<disable<U>::value, bool> apply(U const &value, int &result)
{
return false;
}
};
//**************************************************************************
// INTEGER OUTPUT HELPERS
//**************************************************************************
template <typename T>
class format_store_integer
{
private:
template <typename U> struct is_non_const_ptr
{ static constexpr bool value = std::is_pointer<U>::value && !std::is_const<std::remove_pointer_t<U> >::value; };
template <typename U> struct is_unsigned_ptr
{ static constexpr bool value = std::is_pointer<U>::value && std::is_unsigned<std::remove_pointer_t<U> >::value; };
template <typename U> struct use_unsigned_cast
{ static constexpr bool value = is_non_const_ptr<U>::value && is_unsigned_ptr<U>::value && std::is_convertible<std::make_unsigned_t<std::streamoff>, std::remove_pointer_t<U> >::value; };
template <typename U> struct use_signed_cast
{ static constexpr bool value = is_non_const_ptr<U>::value && !use_unsigned_cast<U>::value && std::is_convertible<std::streamoff, std::remove_pointer_t<U> >::value; };
template <typename U> struct disable
{ static constexpr bool value = !use_unsigned_cast<U>::value && !use_signed_cast<U>::value; };
public:
template <typename U> static std::enable_if_t<use_unsigned_cast<U>::value, bool> apply(U const &value, std::streamoff data)
{
*value = std::remove_pointer_t<U>(std::make_unsigned_t<std::streamoff>(data));
return true;
}
template <typename U> static std::enable_if_t<use_signed_cast<U>::value, bool> apply(U const &value, std::streamoff data)
{
*value = std::remove_pointer_t<U>(std::make_signed_t<std::streamoff>(data));
return true;
}
template <typename U> static std::enable_if_t<disable<U>::value, bool> apply(U const &value, std::streamoff data)
{
assert(false); // inappropriate type for storing characters written so far
return false;
}
};
//**************************************************************************
// NON-POLYMORPHIC ARGUMENT WRAPPER
//**************************************************************************
template <typename Stream>
class format_argument
{
public:
format_argument()
: m_value(nullptr)
, m_output_function(nullptr)
, m_make_integer_function(nullptr)
, m_store_integer_function(nullptr)
{
}
template <typename T>
format_argument(T const &value)
: m_value(reinterpret_cast<void const *>(&value))
, m_output_function(&static_output<T>)
, m_make_integer_function(&static_make_integer<T>)
, m_store_integer_function(&static_store_integer<T>)
{
}
void output(Stream &str, format_flags const &flags) const { m_output_function(str, flags, m_value); }
bool make_integer(int &result) const { return m_make_integer_function(m_value, result); }
void store_integer(std::streamoff data) const { m_store_integer_function(m_value, data); }
private:
typedef void (*output_function)(Stream &str, format_flags const &flags, void const *value);
typedef bool (*make_integer_function)(void const *value, int &result);
typedef void (*store_integer_function)(void const *value, std::streamoff data);
template <typename T> static void static_output(Stream &str, format_flags const &flags, void const *value)
{
format_output<Stream, T>::apply(str, flags, *reinterpret_cast<T const *>(value));
}
template <typename T> static bool static_make_integer(void const *value, int &result)
{
return format_make_integer<T>::apply(*reinterpret_cast<T const *>(value), result);
}
template <typename T> static void static_store_integer(void const *value, std::streamoff data)
{
format_store_integer<T>::apply(*reinterpret_cast<T const *>(value), data);
}
void const *m_value;
output_function m_output_function;
make_integer_function m_make_integer_function;
store_integer_function m_store_integer_function;
};
//**************************************************************************
// NON-POLYMORPHIC ARGUMENT PACK WRAPPER BASE
//**************************************************************************
template <typename Stream = std::ostream>
class format_argument_pack
{
public:
typedef typename Stream::char_type char_type;
typedef char_type const *iterator;
iterator format_begin() const
{
return m_begin;
}
bool format_at_end(iterator it) const
{
return (m_end && (m_end == it)) || (m_check_nul && (format_chars<char_type>::nul == *it));
}
std::size_t argument_count() const
{
return m_argument_count;
}
format_argument<Stream> const &operator[](std::size_t index) const
{
assert(m_argument_count > index);
return m_arguments[index];
}
protected:
template <typename T>
struct handle_char_ptr { static constexpr bool value = std::is_pointer<T>::value && std::is_same<std::remove_cv_t<std::remove_pointer_t<T> >, char_type>::value; };
template <typename T>
struct handle_char_array { static constexpr bool value = std::is_array<T>::value && std::is_same<std::remove_cv_t<std::remove_extent_t<T> >, char_type>::value; };
template <typename T>
struct handle_container { static constexpr bool value = !handle_char_ptr<T>::value && !handle_char_array<T>::value; };
template <typename Format>
format_argument_pack(
Format &&fmt,
format_argument<Stream> const *arguments,
std::enable_if_t<handle_char_ptr<std::remove_reference_t<Format> >::value, std::size_t> argument_count)
: m_begin(fmt)
, m_end(nullptr)
, m_check_nul(true)
, m_arguments(arguments)
, m_argument_count(argument_count)
{
assert(m_begin);
assert(m_end || m_check_nul);
assert(!m_end || (m_end > m_begin));
assert(m_arguments || !m_argument_count);
}
template <typename Format>
format_argument_pack(
Format &&fmt,
format_argument<Stream> const *arguments,
std::enable_if_t<handle_char_array<std::remove_reference_t<Format> >::value, std::size_t> argument_count)
: m_begin(std::cbegin(fmt))
, m_end(std::cend(fmt))
, m_check_nul(true)
, m_arguments(arguments)
, m_argument_count(argument_count)
{
assert(m_begin);
assert(m_end || m_check_nul);
assert(!m_end || (m_end > m_begin));
assert(m_arguments || !m_argument_count);
}
template <typename Format>
format_argument_pack(
Format &&fmt,
format_argument<Stream> const *arguments,
std::enable_if_t<handle_container<std::remove_reference_t<Format> >::value, std::size_t> argument_count)
: m_begin(fmt.empty() ? nullptr : &*std::cbegin(fmt))
, m_end(fmt.empty() ? nullptr : (m_begin + std::distance(std::cbegin(fmt), std::cend(fmt))))
, m_check_nul(true)
, m_arguments(arguments)
, m_argument_count(argument_count)
{
assert(m_begin);
assert(m_end || m_check_nul);
assert(!m_end || (m_end > m_begin));
assert(m_arguments || !m_argument_count);
}
format_argument_pack(format_argument_pack<Stream> const &) = default;
format_argument_pack(format_argument_pack<Stream> &&) = default;
format_argument_pack &operator=(format_argument_pack<Stream> const &) = default;
format_argument_pack &operator=(format_argument_pack<Stream> &&) = default;
private:
iterator m_begin;
iterator m_end;
bool m_check_nul;
format_argument<Stream> const *m_arguments;
std::size_t m_argument_count;
};
//**************************************************************************
// ARGUMENT PACK WRAPPER IMPLEMENTATION
//**************************************************************************
template <typename Stream, std::size_t Count>
class format_argument_pack_impl
: private std::array<format_argument<Stream>, Count>
, public format_argument_pack<Stream>
{
public:
using typename format_argument_pack<Stream>::iterator;
using format_argument_pack<Stream>::operator[];
template <typename Format, typename... Params>
format_argument_pack_impl(Format &&fmt, Params &&... args)
: std::array<format_argument<Stream>, Count>({ { format_argument<Stream>(std::forward<Params>(args))... } })
, format_argument_pack<Stream>(std::forward<Format>(fmt), Count ? &*this->cbegin() : nullptr, Count)
{
static_assert(sizeof...(Params) == Count, "Wrong number of constructor arguments");
}
format_argument_pack_impl(format_argument_pack_impl<Stream, Count> const &) = default;
format_argument_pack_impl(format_argument_pack_impl<Stream, Count> &&) = default;
format_argument_pack_impl &operator=(format_argument_pack_impl<Stream, Count> const &) = default;
format_argument_pack_impl &operator=(format_argument_pack_impl<Stream, Count> &&) = default;
};
//**************************************************************************
// ARGUMENT PACK CREATOR FUNCTION
//**************************************************************************
template <typename Stream = std::ostream, typename Format, typename... Params>
inline format_argument_pack_impl<Stream, sizeof...(Params)> make_format_argument_pack(Format &&fmt, Params &&... args)
{
return format_argument_pack_impl<Stream, sizeof...(Params)>(std::forward<Format>(fmt), std::forward<Params>(args)...);
}
//**************************************************************************
// FORMAT STRING PARSING HELPER
//**************************************************************************
template <typename Format>
class format_helper : public format_chars<typename Format::char_type>
{
public:
static bool parse_format(
Format const &fmt,
typename Format::iterator &it,
format_flags &flags,
int &next_position,
int &argument_position,
int &width_position,
int &precision_position)
{
static_assert((format_helper::nine - format_helper::zero) == 9, "Digits must be contiguous");
assert(!fmt.format_at_end(it));
assert(format_helper::percent == *it);
int num;
int nxt(next_position);
++it;
flags = format_flags();
argument_position = -1;
width_position = -1;
precision_position = -1;
// Leading zeroes are tricky - they could be a zero-pad flag or part of a position specifier
bool const leading_zero(!fmt.format_at_end(it) && (format_helper::zero == *it));
while (!fmt.format_at_end(it) && (format_helper::zero == *it)) ++it;
// Digits encountered at this point could be a field width or a position specifier
num = 0;
bool leading_num(have_digit(fmt, it));
while (have_digit(fmt, it)) add_digit(num, *it++);
if (leading_num && !have_dollar(fmt, it))
{
// No dollar sign, leading number is field width
if (leading_zero) flags.set_zero_pad();
flags.set_field_width(num);
}
else
{
// If we hit a dollar sign after a number, that's a position specifier
if ((leading_zero || leading_num) && have_dollar(fmt, it))
{
argument_position = num;
++it;
}
else if (leading_zero)
{
flags.set_zero_pad();
}
// Parse flag characters
while (!fmt.format_at_end(it))
{
switch (*it)
{
case format_helper::hash: ++it; flags.set_alternate_format(); continue;
case format_helper::zero: ++it; flags.set_zero_pad(); continue;
case format_helper::minus: ++it; flags.set_left_align(); continue;
case format_helper::space: ++it; flags.set_positive_sign_space(); continue;
case format_helper::plus: ++it; flags.set_positive_sign_plus(); continue;
case format_helper::quote: ++it; flags.set_digit_grouping(); continue;
case format_helper::I: ++it; flags.set_alternate_digits(); continue;
default: break;
}
break;
}
// Check for literal or parameterised field width
if (!fmt.format_at_end(it))
{
if (is_digit(*it))
{
flags.set_field_width(read_number(fmt, it));
}
else if (format_helper::asterisk == *it)
{
++it;
if (have_digit(fmt, it))
{
num = read_number(fmt, it);
assert(have_dollar(fmt, it)); // invalid positional width
if (!have_dollar(fmt, it)) return false;
width_position = num;
nxt = width_position + 1;
++it;
}
else
{
width_position = nxt++;
}
}
}
}
// Check for literal or parameterised precision
if (!fmt.format_at_end(it) && (*it == format_helper::point))
{
++it;
if (have_digit(fmt, it))
{
flags.set_precision(read_number(fmt, it));
}
else if (!fmt.format_at_end(it) && (format_helper::asterisk == *it))
{
++it;
if (have_digit(fmt, it))
{
num = read_number(fmt, it);
assert(have_dollar(fmt, it)); // invalid positional precision
if (!have_dollar(fmt, it)) return false;
precision_position = num;
nxt = precision_position + 1;
++it;
}
else
{
precision_position = nxt++;
}
}
else
{
flags.set_precision(0);
}
}
// Check for length modifiers
if (!fmt.format_at_end(it)) switch (*it)
{
case format_helper::h:
++it;
if (!fmt.format_at_end(it) && (format_helper::h == *it))
{
++it;
flags.set_length(format_flags::length::character);
}
else
{
flags.set_length(format_flags::length::short_integer);
}
break;
case format_helper::l:
++it;
if (!fmt.format_at_end(it) && (format_helper::l == *it))
{
++it;
flags.set_length(format_flags::length::long_long_integer);
}
else
{
flags.set_length(format_flags::length::long_integer);
}
break;
case format_helper::L:
++it;
flags.set_length(format_flags::length::long_double);
break;
case format_helper::j:
++it;
flags.set_length(format_flags::length::integer_maximum);
break;
case format_helper::z:
++it;
flags.set_length(format_flags::length::size_type);
break;
case format_helper::t:
++it;
flags.set_length(format_flags::length::pointer_difference);
break;
case format_helper::I:
{
++it;
format_flags::length length = format_flags::length::size_type;
if (!fmt.format_at_end(it))
{
if ((typename format_helper::char_type(format_helper::zero) + 3) == *it)
{
typename Format::iterator tmp(it);
++tmp;
if (!fmt.format_at_end(tmp) && ((typename format_helper::char_type(format_helper::zero) + 2) == *tmp))
{
length = format_flags::length::integer_32;
it = ++tmp;
}
}
else if ((typename format_helper::char_type(format_helper::zero) + 6) == *it)
{
typename Format::iterator tmp(it);
++tmp;
if (!fmt.format_at_end(tmp) && ((typename format_helper::char_type(format_helper::zero) + 4) == *tmp))
{
length = format_flags::length::integer_64;
it = ++tmp;
}
}
}
flags.set_length(length);
}
break;
case format_helper::w:
++it;
flags.set_length(format_flags::length::wide_character);
break;
default:
break;
}
// Now we should find a conversion specifier
assert(!fmt.format_at_end(it)); // missing conversion
if (fmt.format_at_end(it)) return false;
switch (*it)
{
case format_helper::d:
case format_helper::i:
flags.set_conversion(format_flags::conversion::signed_decimal);
break;
case format_helper::o:
flags.set_conversion(format_flags::conversion::octal);
break;
case format_helper::u:
flags.set_conversion(format_flags::conversion::unsigned_decimal);
break;
case format_helper::X:
flags.set_uppercase();
case format_helper::x:
flags.set_conversion(format_flags::conversion::hexadecimal);
break;
case format_helper::E:
flags.set_uppercase();
case format_helper::e:
flags.set_conversion(format_flags::conversion::scientific_decimal);
break;
case format_helper::F:
flags.set_uppercase();
case format_helper::f:
flags.set_conversion(format_flags::conversion::fixed_decimal);
break;
case format_helper::G:
flags.set_uppercase();
case format_helper::g:
flags.set_conversion(format_flags::conversion::floating_decimal);
break;
case format_helper::A:
flags.set_uppercase();
case format_helper::a:
flags.set_conversion(format_flags::conversion::scientific_hexadecimal);
break;
case format_helper::C:
if (format_flags::length::unspecified == flags.get_length())
flags.set_length(format_flags::length::long_integer);
case format_helper::c:
flags.set_conversion(format_flags::conversion::character);
break;
case format_helper::S:
if (format_flags::length::unspecified == flags.get_length())
flags.set_length(format_flags::length::long_integer);
case format_helper::s:
flags.set_conversion(format_flags::conversion::string);
break;
case format_helper::p:
flags.set_conversion(format_flags::conversion::pointer);
break;
case format_helper::n:
flags.set_conversion(format_flags::conversion::tell);
break;
case format_helper::m:
flags.set_conversion(format_flags::conversion::strerror);
break;
case format_helper::percent:
flags.set_conversion(format_flags::conversion::percent);
break;
default:
assert(false); // unsupported conversion
return false;
}
++it;
// Finalise argument position
if (argument_position < 0) argument_position = nxt;
next_position = argument_position;
switch (flags.get_conversion())
{
case format_flags::conversion::strerror:
case format_flags::conversion::percent:
break;
default:
++next_position;
}
return true;
}
private:
static bool have_dollar(Format const &fmt, typename Format::iterator const &it)
{
return !fmt.format_at_end(it) && (*it == format_helper::dollar);
}
static bool have_digit(Format const &fmt, typename Format::iterator const &it)
{
return !fmt.format_at_end(it) && is_digit(*it);
}
static bool is_digit(typename format_helper::char_type value)
{
return (format_helper::zero <= value) && (format_helper::nine >= value);
}
static int digit_value(typename format_helper::char_type value)
{
assert(is_digit(value));
return int(std::make_signed_t<decltype(value)>(value - format_helper::zero));
}
static void add_digit(int &num, typename format_helper::char_type digit)
{
num = (num * 10) + digit_value(digit);
}
static int read_number(Format const &fmt, typename Format::iterator &it)
{
assert(have_digit(fmt, it));
int value = 0;
do add_digit(value, *it++); while (have_digit(fmt, it));
return value;
}
};
//**************************************************************************
// CORE FORMATTING FUNCTION
//**************************************************************************
template <typename Stream, typename Base>
typename Stream::off_type stream_format(Stream &str, format_argument_pack<Base> const &args)
{
typedef format_helper<format_argument_pack<Base> > format_helper;
typedef typename format_argument_pack<Base>::iterator iterator;
class stream_preserver
{
public:
stream_preserver(Stream &stream)
: m_stream(stream)
, m_fill(stream.fill())
, m_flags(stream.flags())
, m_precision(stream.precision())
, m_width(stream.width())
{
}
~stream_preserver()
{
m_stream.width(m_width);
m_stream.precision(m_precision);
m_stream.flags(m_flags);
m_stream.fill(m_fill);
}
private:
Stream &m_stream;
typename Stream::char_type m_fill;
typename Stream::fmtflags m_flags;
std::streamsize m_precision;
std::streamsize m_width;
};
typename Stream::pos_type const begin(str.tellp());
stream_preserver const preserver(str);
int next_pos(1);
iterator start = args.format_begin();
for (iterator it = start; !args.format_at_end(start); )
{
while (!args.format_at_end(it) && (format_helper::percent != *it)) ++it;
if (start != it)
{
str.write(&*start, it - start);
start = it;
}
if (!args.format_at_end(it))
{
// Try to parse a percent format specification
format_flags flags;
int arg_pos, width_pos, prec_pos;
if (!format_helper::parse_format(args, it, flags, next_pos, arg_pos, width_pos, prec_pos))
continue;
// Handle parameterised width
if (0 <= width_pos)
{
assert(flags.get_field_width() == 0U);
assert(0 < width_pos);
assert(args.argument_count() >= unsigned(width_pos));
if ((0 < width_pos) && (args.argument_count() >= unsigned(width_pos)))
{
int width;
if (args[width_pos - 1].make_integer(width))
{
if (0 > width)
{
flags.set_left_align();
flags.set_field_width(unsigned(-width));
}
else
{
flags.set_field_width(unsigned(width));
}
}
else
{
assert(false); // inappropriate type passed as width argument
}
}
}
// Handle parameterised precision
if (0 <= prec_pos)
{
assert(flags.get_precision() < 0);
assert(0 < prec_pos);
assert(args.argument_count() >= unsigned(prec_pos));
if ((0 < prec_pos) && (args.argument_count() >= unsigned(prec_pos)))
{
int precision;
if (args[prec_pos - 1].make_integer(precision))
flags.set_precision(precision);
else
assert(false); // inappropriate type passed as precision argument
}
}
// Some conversions don't actually take an argument - get them out of the way
flags.apply(str);
if (format_flags::conversion::strerror == flags.get_conversion())
{
str << std::strerror(errno);
start = it;
}
else if (format_flags::conversion::percent == flags.get_conversion())
{
str << typename Stream::char_type(format_chars<typename Stream::char_type>::percent);
start = it;
}
else
{
assert(0 < arg_pos);
assert(args.argument_count() >= unsigned(arg_pos));
if ((0 >= arg_pos) || (args.argument_count() < unsigned(arg_pos)))
continue;
if (format_flags::conversion::tell == flags.get_conversion())
{
typename Stream::pos_type const current(str.tellp());
args[arg_pos - 1].store_integer(
((typename Stream::pos_type(-1) == begin) || (typename Stream::pos_type(-1) == current))
? typename Stream::off_type(-1)
: (current - begin));
}
else
{
args[arg_pos - 1].output(str, flags);
}
start = it;
}
}
}
typename Stream::pos_type const end(str.tellp());
return ((typename Stream::pos_type(-1) == begin) || (typename Stream::pos_type(-1) == end))
? typename Stream::off_type(-1)
: (end - begin);
}
} // namespace detail
//**************************************************************************
// FORMAT TO STREAM FUNCTIONS
//**************************************************************************
template <typename Stream, typename Format, typename... Params>
inline typename Stream::off_type stream_format(Stream &str, Format const &fmt, Params &&... args)
{
return detail::stream_format(str, detail::make_format_argument_pack<Stream>(fmt, std::forward<Params>(args)...));
}
template <typename Stream, typename Base>
inline typename Stream::off_type stream_format(Stream &str, detail::format_argument_pack<Base> const &args)
{
return detail::stream_format(str, args);
}
template <typename Stream, typename Base>
inline typename Stream::off_type stream_format(Stream &str, detail::format_argument_pack<Base> &&args)
{
return detail::stream_format(str, args);
}
//**************************************************************************
// FORMAT TO NEW STRING FUNCTIONS
//**************************************************************************
template <typename String = std::string, typename Format, typename... Params>
inline String string_format(Format &&fmt, Params &&... args)
{
typedef std::basic_ostringstream<typename String::value_type, typename String::traits_type, typename String::allocator_type> ostream;
ostream str;
stream_format(str, fmt, std::forward<Params>(args)...);
return str.str();
};
template <typename String = std::string, typename Format, typename... Params>
inline String string_format(std::locale const &locale, Format &&fmt, Params &&... args)
{
typedef std::basic_ostringstream<typename String::value_type, typename String::traits_type, typename String::allocator_type> ostream;
ostream str;
str.imbue(locale);
stream_format(str, fmt, std::forward<Params>(args)...);
return str.str();
};
template <typename String = std::string, typename Stream>
inline String string_format(detail::format_argument_pack<Stream> const &args)
{
typedef std::basic_ostringstream<typename String::value_type, typename String::traits_type, typename String::allocator_type> ostream;
ostream str;
detail::stream_format(str, args);
return str.str();
};
template <typename String = std::string, typename Stream>
inline String string_format(detail::format_argument_pack<Stream> &&args)
{
typedef std::basic_ostringstream<typename String::value_type, typename String::traits_type, typename String::allocator_type> ostream;
ostream str;
detail::stream_format(str, std::move(args));
return str.str();
};
template <typename String = std::string, typename Stream>
inline String string_format(std::locale const &locale, detail::format_argument_pack<Stream> const &args)
{
typedef std::basic_ostringstream<typename String::value_type, typename String::traits_type, typename String::allocator_type> ostream;
ostream str;
str.imbue(locale);
detail::stream_format(str, args);
return str.str();
};
template <typename String = std::string, typename Stream>
inline String string_format(std::locale const &locale, detail::format_argument_pack<Stream> &&args)
{
typedef std::basic_ostringstream<typename String::value_type, typename String::traits_type, typename String::allocator_type> ostream;
ostream str;
str.imbue(locale);
detail::stream_format(str, std::move(args));
return str.str();
};
//**************************************************************************
// CREATING ARGUMENT PACKS
//**************************************************************************
using detail::format_argument_pack;
using detail::make_format_argument_pack;
} // namespace util
using util::string_format;
//**************************************************************************
// EXTERNAL TEMPLATE INSTANTIATIONS
//**************************************************************************
namespace util {
namespace detail {
extern template class format_chars<char>;
extern template class format_chars<wchar_t>;
extern template void format_flags::apply(std::ostream &) const;
extern template void format_flags::apply(std::wostream &) const;
extern template void format_flags::apply(std::iostream &) const;
extern template void format_flags::apply(std::wiostream &) const;
extern template void format_flags::apply(std::ostringstream &) const;
extern template void format_flags::apply(std::wostringstream &) const;
extern template void format_flags::apply(std::stringstream &) const;
extern template void format_flags::apply(std::wstringstream &) const;
extern template void format_flags::apply(ovectorstream &) const;
extern template void format_flags::apply(wovectorstream &) const;
extern template void format_flags::apply(vectorstream &) const;
extern template void format_flags::apply(wvectorstream &) const;
extern template class format_argument<std::ostream>;
extern template class format_argument<std::wostream>;
extern template class format_argument<std::iostream>;
extern template class format_argument<std::wiostream>;
extern template class format_argument<std::ostringstream>;
extern template class format_argument<std::wostringstream>;
extern template class format_argument<std::stringstream>;
extern template class format_argument<std::wstringstream>;
extern template class format_argument<ovectorstream>;
extern template class format_argument<wovectorstream>;
extern template class format_argument<vectorstream>;
extern template class format_argument<wvectorstream>;
extern template class format_argument_pack<std::ostream>;
extern template class format_argument_pack<std::wostream>;
extern template class format_argument_pack<std::iostream>;
extern template class format_argument_pack<std::wiostream>;
extern template class format_argument_pack<std::ostringstream>;
extern template class format_argument_pack<std::wostringstream>;
extern template class format_argument_pack<std::stringstream>;
extern template class format_argument_pack<std::wstringstream>;
extern template class format_argument_pack<ovectorstream>;
extern template class format_argument_pack<wovectorstream>;
extern template class format_argument_pack<vectorstream>;
extern template class format_argument_pack<wvectorstream>;
extern template std::ostream::off_type stream_format(std::ostream &, format_argument_pack<std::ostream> const &);
extern template std::wostream::off_type stream_format(std::wostream &, format_argument_pack<std::wostream> const &);
extern template std::iostream::off_type stream_format(std::iostream &, format_argument_pack<std::ostream> const &);
extern template std::iostream::off_type stream_format(std::iostream &, format_argument_pack<std::iostream> const &);
extern template std::wiostream::off_type stream_format(std::wiostream &, format_argument_pack<std::wostream> const &);
extern template std::wiostream::off_type stream_format(std::wiostream &, format_argument_pack<std::wiostream> const &);
extern template std::ostringstream::off_type stream_format(std::ostringstream &, format_argument_pack<std::ostream> const &);
extern template std::ostringstream::off_type stream_format(std::ostringstream &, format_argument_pack<std::ostringstream> const &);
extern template std::wostringstream::off_type stream_format(std::wostringstream &, format_argument_pack<std::wostream> const &);
extern template std::wostringstream::off_type stream_format(std::wostringstream &, format_argument_pack<std::wostringstream> const &);
extern template std::stringstream::off_type stream_format(std::stringstream &, format_argument_pack<std::ostream> const &);
extern template std::stringstream::off_type stream_format(std::stringstream &, format_argument_pack<std::iostream> const &);
extern template std::stringstream::off_type stream_format(std::stringstream &, format_argument_pack<std::stringstream> const &);
extern template std::wstringstream::off_type stream_format(std::wstringstream &, format_argument_pack<std::wostream> const &);
extern template std::wstringstream::off_type stream_format(std::wstringstream &, format_argument_pack<std::wiostream> const &);
extern template std::wstringstream::off_type stream_format(std::wstringstream &, format_argument_pack<std::wstringstream> const &);
extern template ovectorstream::off_type stream_format(ovectorstream &, format_argument_pack<std::ostream> const &);
extern template ovectorstream::off_type stream_format(ovectorstream &, format_argument_pack<ovectorstream> const &);
extern template wovectorstream::off_type stream_format(wovectorstream &, format_argument_pack<std::wostream> const &);
extern template wovectorstream::off_type stream_format(wovectorstream &, format_argument_pack<wovectorstream> const &);
extern template vectorstream::off_type stream_format(vectorstream &, format_argument_pack<std::ostream> const &);
extern template vectorstream::off_type stream_format(vectorstream &, format_argument_pack<std::iostream> const &);
extern template vectorstream::off_type stream_format(vectorstream &, format_argument_pack<vectorstream> const &);
extern template wvectorstream::off_type stream_format(wvectorstream &, format_argument_pack<std::wostream> const &);
extern template wvectorstream::off_type stream_format(wvectorstream &, format_argument_pack<std::wiostream> const &);
extern template wvectorstream::off_type stream_format(wvectorstream &, format_argument_pack<wvectorstream> const &);
} // namespace detail
} // namespace util
#endif // MAME_UTIL_STRFORMAT_H