mgl_memory_utility.h

[詳解]

// SPDX-License-Identifier: Zlib
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
 
#ifndef INCGUARD_MGL_MEMORY_UTILITY_H_1752227311
#define INCGUARD_MGL_MEMORY_UTILITY_H_1752227311
 
#include <cstdint>
#include <cstdlib>
#include <cstring>
#include <type_traits>
 
namespace MGL::Memory
{
enum class ClearMode : uint8_t
{
    Auto,    
    Zero,    
    None,    
};
 
namespace Utility
{
/* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
template <class ValueType>
ValueType *InitializeArrayBuffer(void *arrayTop, size_t elementSize, ClearMode mode) noexcept
{
    // クラスかつデフォルトの場合は何もしない
    if constexpr (std::is_class_v<ValueType>)
    {
        if (mode == ClearMode::Auto)
        {
            mode = ClearMode::None;
        }
    }
    // それ以外の型はゼロクリア
    else
    {
        mode = ClearMode::Zero;
    }
 
    // メモリ領域のクリア
    if (mode == ClearMode::Zero)
    {
        memset(arrayTop, 0, sizeof(ValueType) * elementSize);
    }
 
    return new (arrayTop) ValueType[elementSize];
}
}    // namespace Utility
}    // namespace MGL::Memory
 
#endif    // INCGUARD_MGL_MEMORY_UTILITY_H_1752227311
 
// vim: et ts=4 sw=4 sts=4