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std::multiplies<void>

STD：乘数<void>

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

std::multiplies<>是std::multiplies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 the product of two arguments (public member function)

乘数<>：：操作符%28%29

template< class T, class U> constexpr auto operator()( T&& lhs, U&& rhs ) const -> decltype(std::forward(lhs) * std::forward(rhs)​​

返回乘积的结果。lhs通过rhs%28或其他operator*重载到执行%29。

参数

lhs, rhs-values to multiply

返回值

结果lhs * rhs...

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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