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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
corealloc.h
Memory allocation helpers for the helper library.
***************************************************************************/
#pragma once
#ifndef MAME_LIB_UTIL_COREALLOC_H
#define MAME_LIB_UTIL_COREALLOC_H
#include "osdcore.h"
#include <stdlib.h>
#include <cstddef>
#include <cstring>
#include <new>
#include <memory>
#include <type_traits>
#include <utility>
//**************************************************************************
// MACROS
//**************************************************************************
// global allocation helpers -- use these instead of new and delete
#define global_alloc(_type) new _type
#define global_alloc_nothrow(_type) new (std::nothrow) _type
#define global_alloc_array(_type, _num) new _type[_num]
#define global_alloc_array_nothrow(_type, _num) new (std::nothrow) _type[_num]
#define global_free(_ptr) do { delete _ptr; } while (0)
#define global_free_array(_ptr) do { delete[] _ptr; } while (0)
template<typename T, typename... Params>
inline T* global_alloc_clear(Params &&... args)
{
void *const ptr = ::operator new(sizeof(T)); // allocate memory
std::memset(ptr, 0, sizeof(T));
return new(ptr) T(std::forward<Params>(args)...);
}
template<typename T>
inline T* global_alloc_array_clear(std::size_t num)
{
auto const size = sizeof(T) * num;
void *const ptr = new unsigned char[size]; // allocate memory
std::memset(ptr, 0, size);
return new(ptr) T[num]();
}
template<typename _Tp>
struct _MakeUniqClear
{
typedef std::unique_ptr<_Tp> __single_object;
};
template<typename _Tp>
struct _MakeUniqClear<_Tp[]>
{
typedef std::unique_ptr<_Tp[]> __array;
};
template<typename _Tp, size_t _Bound>
struct _MakeUniqClear<_Tp[_Bound]>
{
struct __invalid_type { };
};
/// make_unique_clear for single objects
template<typename _Tp, typename... _Args>
inline typename _MakeUniqClear<_Tp>::__single_object make_unique_clear(_Args&&... __args)
{
unsigned char* ptr = new unsigned char[sizeof(_Tp)]; // allocate memory
memset(ptr, 0, sizeof(_Tp));
return std::unique_ptr<_Tp>(new(ptr) _Tp(std::forward<_Args>(__args)...));
}
/// make_unique_clear for arrays of unknown bound
template<typename _Tp>
inline typename _MakeUniqClear<_Tp>::__array make_unique_clear(size_t __num)
{
auto size = sizeof(std::remove_extent_t<_Tp>) * __num;
unsigned char* ptr = new unsigned char[size]; // allocate memory
memset(ptr, 0, size);
return std::unique_ptr<_Tp>(new(ptr) std::remove_extent_t<_Tp>[__num]());
}
template<typename _Tp, unsigned char _F>
inline typename _MakeUniqClear<_Tp>::__array make_unique_clear(size_t __num)
{
auto size = sizeof(std::remove_extent_t<_Tp>) * __num;
unsigned char* ptr = new unsigned char[size]; // allocate memory
memset(ptr, _F, size);
return std::unique_ptr<_Tp>(new(ptr) std::remove_extent_t<_Tp>[__num]());
}
/// Disable make_unique_clear for arrays of known bound
template<typename _Tp, typename... _Args>
inline typename _MakeUniqClear<_Tp>::__invalid_type make_unique_clear(_Args&&...) = delete;
#endif // MAME_LIB_UTIL_COREALLOC_H
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