std::plus (3) - Linux Manuals

std::plus: std::plus


std::plus - std::plus


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.


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)


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.


lhs, rhs - values to sum

Return value

The result of lhs + rhs.



Possible implementation

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