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Synchronize identity with C++20 #153

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Synchronize identity with C++20 #153

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6 changes: 3 additions & 3 deletions MyTinySTL/functional.h
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Original file line number Diff line number Diff line change
Expand Up @@ -139,10 +139,10 @@ struct logical_not :public unarg_function<T, bool>
};

// 证同函数：不会改变元素，返回本身
template <class T>
struct identity :public unarg_function<T, bool>
struct identity
{
const T& operator()(const T& x) const { return x; }
template <class T>
constexpr T&& operator()(T&& x) const noexcept { return static_cast<T&&>(x); }
};

// 选择函数：接受一个 pair，返回第一个元素
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