W3cubDocs

/C++

std::minus

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

Function object for performing subtraction. Effectively calls operator- on two instances of type T.

Specializations

The standard library provides a specialization of std::minus when T is not specified, which leaves the parameter types and return type to be deduced.

function object implementing x - y deducing argument and return types
(class template specialization)
(since C++14)

Member types

Type Definition
result_type(deprecated in C++17) T
first_argument_type(deprecated in C++17) T
second_argument_type(deprecated in C++17) T

Member functions

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

std::minus::operator()

T operator()( const T& lhs, const T& rhs ) const;
(until C++14)
constexpr T operator()( const T& lhs, const T& rhs ) const;
(since C++14)

Returns the difference between lhs and rhs.

Parameters

lhs, rhs - values to subtract from one another

Return value

The result of lhs - rhs.

Exceptions

(none).

Possible implementation

constexpr T operator()(const T &lhs, const T &rhs) const 
{
    return lhs - rhs;
}

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/utility/functional/minus