std::minus (3) - Linux Manuals

std::minus: std::minus

NAME

std::minus - std::minus

Synopsis

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

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 (since C++14)
minus<void> (class template specialization)

Member types

Type Definition (until C++20)
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

           returns the difference between two arguments
operator() (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;
  }