std::plus

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.

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.

plus<void>

function object implementing x + y deducing argument and return types
(class template specialization)

(since C++14)

Member types

Type	Definition
`result_type`	`T`
`first_argument_type`	`T`
`second_argument_type`	`T`

Member functions

operator()

returns the sum of two arguments
(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;
}

Links:

http://en.cppreference.com/w/cpp/utility/functional/plus

doc_CPP

2016-10-11 10:05:42

Comments