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std::negate<void>

STD：否定<void>

Defined in header ​​
template<> class negate<void>;​(since C++14)

std::negate<>是std::negate并推导出参数和返回类型。

成员类型

Member typeDefinition
is_transparent/* unspecified */

成员函数

operator()returns its negated argument (public member function)

否定<>：：操作符%28%29

template< class T > constexpr auto operator()( T&& arg ) const -> decltype(-std::forward(arg)​​

返回否定的结果。arg%28或任何一元operator-重载到执行%29。

参数

arg-value to negate

返回值

结果-arg...

注记

成员类型is_transparent向调用方指示此函数对象是透明FunctionObject：它接受任意类型的参数，并使用完美的转发，这避免了在异构上下文中使用函数对象或使用rvalue参数时不必要的复制和转换。特别是模板函数，例如std::set::find和std::set::lower_bound在它们的Compare类型。

例

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