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std::plus

From cppreference.com
< cpp‎ | utility‎ | functional
 
 
 
Function objects


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

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

Contents

[edit] 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
(class template specialization) [edit]
(since C++14)

[edit] Member types

Type Definition
result_type T
first_argument_type T
second_argument_type T

[edit] Member functions

operator()
returns the sum of two arguments
(public member function) [edit]

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;
}