Namespaces
Variants
Views
Actions

Difference between revisions of "cpp/utility/functional/plus"

From cppreference.com
< cpp‎ | utility‎ | functional
m (Update links.)
(Start describing C++14 function objects)
Line 3: Line 3:
 
{{dcl begin}}
 
{{dcl begin}}
 
{{dcl header | functional }}
 
{{dcl header | functional }}
−
{{dcl |
+
{{dcl rev begin}}
 +
{{dcl | until=c++14 |
 
template< class T >
 
template< class T >
 
struct plus;
 
struct plus;
 
}}
 
}}
 +
{{dcl | since=c++14 |
 +
template< class T {{=}} void >
 +
struct plus;
 +
}}
 +
{{dcl rev end}}
 
{{dcl end}}
 
{{dcl end}}
  
 
Function object for performing addition. Effectively calls {{c|operator+}} on two instances of type {{tt|T}}.
 
Function object for performing addition. Effectively calls {{c|operator+}} on two instances of type {{tt|T}}.
 +
 +
===Specializations===
 +
The standard library provides a specialization of {{tt|std::plus}} when {{tt|T}} is not specified, which leaves the parameter types and return type to be deduced.
 +
{{dsc begin}}
 +
{{dsc inc | cpp/utility/functional/dsc plus_void}} {{mark c++14}}
 +
{{dsc end}}
  
 
===Member types===
 
===Member types===

Revision as of 11:51, 6 August 2013

 
C++
 
Utilities library
General utilities
Relational operators (deprecated in C++20)
 
Function objects
Function invocation
(C++17)(C++23)
Identity function object
(C++20)
Transparent operator wrappers
(C++14)
(C++14)
(C++14)
(C++14)  
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)
(C++14)

Old binders and adaptors
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)
(until C++17*)  
(until C++17*)
(until C++17*)(until C++17*)(until C++17*)(until C++17*)
(until C++20*)
(until C++20*)
(until C++17*)(until C++17*)
(until C++17*)(until C++17*)

(until C++17*)
(until C++17*)(until C++17*)(until C++17*)(until C++17*)
(until C++20*)
(until C++20*)
 
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

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.

(C++14)
 function object implementing x + y deducing parameter and return types
(class template specialization) [edit]

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) [edit]

std::plus::operator()

T operator()( const T& lhs, const T& rhs ) const;

Returns the sum of lhs and rhs.

Parameters

lhs, rhs - values to sum

Return value

The result of lhs + rhs.

Exceptions

(none)

Possible implementation

T operator()(const T &lhs, const T &rhs) const 
{
    return lhs + rhs;
}
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/utility/functional/plus&oldid=64020"