std::minus (3) - Linux Man Pages

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;
  }