std::plus (3) - Linux Manuals

std::plus: std::plus

NAME

std::plus - std::plus

Synopsis


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


Function object for performing addition. Effectively calls operator+ on two instances of type T.

Specializations


The standard library provides a specialization of std::plus 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)
plus<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 sum of two arguments
operator() (public member function)


 std::plus::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 sum of lhs and rhs.

Parameters


lhs, rhs - values to sum

Return value


The result of lhs + rhs.

Exceptions


(none)

Possible implementation


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