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std::plus<void>

STD：+<void>

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

std::plus<>是std::plus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 sum of two arguments (public member function)

STD：：PLUS<>：：操作员%28%29

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

返回的和lhs和rhs...

参数

lhs, rhs-values to sum

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

二次

#include <functional>
#include <iostream>
 
int main()
{
    std::string a = "Hello ";
    const char* b = "world";
    std::cout << std::plus<>{}(a, b) << '\n';
}

二次

产出：

二次

Hello world

二次

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