NAME¶

std::minus - std::minus

Synopsis¶

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

std::minus<void> is a specialization of std::minus with parameter and return type
deduced.

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¶

// Run this code

#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)