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Fix address_of for overloaded operator& #139

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Fix address_of for overloaded operator& #139

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4b7d5dd
Fix `address_of` for overloaded `operator&`
frederick-vs-ja Oct 10, 2023
962250e
Should not remove reference
frederick-vs-ja Mar 14, 2024
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32 changes: 32 additions & 0 deletions MyTinySTL/memory.h
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Original file line number Diff line number Diff line change
Expand Up @@ -17,11 +17,43 @@ namespace mystl
{

// 获取对象地址
// 尽可能使用支持 constexpr 的 __builtin_addressof
#ifdef __has_builtin
#define MYTINYSTL_HAS_BUITIN_ADDRESSOF __has_builtin(__builtin_addressof)
#elif __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ >=70000
#define MYTINYSTL_HAS_BUITIN_ADDRESSOF 1
#elif _MSC_VER >= 1910
#define MYTINYSTL_HAS_BUITIN_ADDRESSOF 1
#else
#define MYTINYSTL_HAS_BUITIN_ADDRESSOF 0
#endif

#if MYTINYSTL_HAS_BUITIN_ADDRESSOF
template <class Tp>
constexpr Tp* address_of(Tp& value) noexcept
{
return __builtin_addressof(value);
}
#else
// 对于对象类型和函数类型分别使用不同的策略
template <class Tp, typename std::enable_if<std::is_object<Tp>::value, int>::type = 0>
Tp* address_of(Tp& value) noexcept
{
return const_cast<Tp*>(reinterpret_cast<const volatile Tp*>(
&reinterpret_cast<const volatile unsigned char&>(value)));
}

template <class Tp, typename std::enable_if<!std::is_object<Tp>::value, int>::type = 0>
constexpr Tp* address_of(Tp& value) noexcept
{
return &value;
}
#endif

#undef MYTINYSTL_HAS_BUITIN_ADDRESSOF

template <class Tp>
void address_of(const Tp&&) = delete; // 避免对临时对象取地址

// 获取 / 释放 临时缓冲区

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