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// license:GPL-2.0+
// copyright-holders:Couriersud
/*
* putil.h
*
*/
#ifndef PUTIL_H_
#define PUTIL_H_
#include "pstring.h"
#include <algorithm>
#include <initializer_list>
#include <vector>
#define PSTRINGIFY_HELP(y) # y
#define PSTRINGIFY(x) PSTRINGIFY_HELP(x)
namespace plib
{
namespace util
{
const pstring buildpath(std::initializer_list<pstring> list );
const pstring environment(const pstring &var, const pstring &default_val);
} // namespace util
namespace container
{
template <class C, class T>
bool contains(C &con, const T &elem)
{
return std::find(con.begin(), con.end(), elem) != con.end();
}
static constexpr const std::size_t npos = static_cast<std::size_t>(-1);
template <class C>
std::size_t indexof(C &con, const typename C::value_type &elem)
{
auto it = std::find(con.begin(), con.end(), elem);
if (it != con.end())
return static_cast<std::size_t>(it - con.begin());
return npos;
}
template <class C>
void insert_at(C &con, const std::size_t index, const typename C::value_type &elem)
{
con.insert(con.begin() + static_cast<std::ptrdiff_t>(index), elem);
}
template <class C>
void remove(C &con, const typename C::value_type &elem)
{
con.erase(std::remove(con.begin(), con.end(), elem), con.end());
}
} // namespace container
/* May be further specialized .... This is the generic version */
template <typename T>
struct constants
{
static constexpr T zero() noexcept { return static_cast<T>(0); }
static constexpr T one() noexcept { return static_cast<T>(1); }
static constexpr T two() noexcept { return static_cast<T>(2); }
template <typename V>
static constexpr const T cast(V &&v) noexcept { return static_cast<T>(v); }
};
static_assert(noexcept(constants<double>::one()) == true, "Not evaluated as constexpr");
template <class C>
struct indexed_compare
{
explicit indexed_compare(const C& target): m_target(target) {}
bool operator()(int a, int b) const { return m_target[a] < m_target[b]; }
const C& m_target;
};
// ----------------------------------------------------------------------------------------
// string list
// ----------------------------------------------------------------------------------------
std::vector<pstring> psplit(const pstring &str, const pstring &onstr, bool ignore_empty = false);
std::vector<pstring> psplit(const pstring &str, const std::vector<pstring> &onstrl);
std::vector<std::string> psplit_r(const std::string &stri,
const std::string &token,
const std::size_t maxsplit);
//============================================================
// penum - strongly typed enumeration
//============================================================
struct penum_base
{
protected:
static int from_string_int(const char *str, const char *x);
static std::string nthstr(int n, const char *str);
};
} // namespace plib
#define P_ENUM(ename, ...) \
struct ename : public plib::penum_base { \
enum E { __VA_ARGS__ }; \
ename (E v) : m_v(v) { } \
bool set_from_string (const std::string &s) { \
static char const *const strings = # __VA_ARGS__; \
int f = from_string_int(strings, s.c_str()); \
if (f>=0) { m_v = static_cast<E>(f); return true; } else { return false; } \
} \
operator E() const {return m_v;} \
bool operator==(const ename &rhs) const {return m_v == rhs.m_v;} \
bool operator==(const E &rhs) const {return m_v == rhs;} \
std::string name() const { \
static char const *const strings = # __VA_ARGS__; \
return nthstr(static_cast<int>(m_v), strings); \
} \
private: E m_v; };
#endif /* PUTIL_H_ */
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