std::minus<void>

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< cpp‎ | utility‎ | functional
Utilities library
Function objects
Function invocation
(C++17)(C++23)
Identity function object
(C++20)
Transparent operator wrappers
(C++14)
minus<>
(C++14)
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(C++14)
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(C++14)

Old binders and adaptors
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)
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(until C++17*)
(until C++17*) (until C++17*) (until C++17*) (until C++17*)
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(until C++17*)(until C++17*)
(until C++17*)(until C++17*)

(until C++17*)
(until C++17*) (until C++17*) (until C++17*) (until C++17*)
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Defined in header <functional>
template <>
class minus< void > ;
(since C++14)

std::minus<void> is a specialization of std::minus

Member types

Type Definition
is_transparent unspecified

Member functions

operator()
returns the difference of two arguments
(public member function)

std::minus<void>::operator()

template < class T, class U >

constexpr auto operator( ) ( T&& lhs, U&& rhs ) const

- > decltype( std::forward <T> (lhs) - std::forward <U> (rhs) ) ;

Returns the difference of lhs and rhs.

Parameters

lhs, rhs - values to subtract

Return value

std::forward <T> (lhs) - std::forward <U> (rhs)

Example

#include <complex>
#include <functional>
#include <iostream>
 
int main()
{
    auto complex_minus = std::minus<void>{}; // “void” can be omitted
    constexpr std::complex<int> z(4, 2);
    std::cout << complex_minus(z, 1) << '\n';
    std::cout << (z - 1) << '\n';
}

Output:

(3,2)
(3,2)