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plus
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plus
Function Object
Summary
A binary function object that returns the result of adding its first and second arguments.
Data Type and Member Function Indexes
(exclusive of constructors and destructors)
None
Synopsis
#include <functional> template<class T> struct plus : public binary_function<T, T, T> ;
Description
plus is a binary function object. Its operator() returns the result of adding x and y. You can pass a plus object to any algorithm that uses a binary function. For example, the transform algorithm applies a binary operation to corresponding values in two collections and stores the result. plus would be used in that algorithm in the following manner:
vector<int> vec1; vector<int> vec2; vector<int> vecResult; . . . transform(vec1.begin(), vec1.end(), vec2.begin(), vecResult.begin(), plus<int>());
After this call to transform, vecResult(n) will contain vec1(n) plus vec2(n).
Interface
template<class T> struct plus : binary_function<T, T, T> { typedef typename binary_function<T, T, T>::second_argument_type second_argument_type; typedef typename binary_function<T, T, T>::first_argument_type first_argument_type; typedef typename binary_function<T, T, T>::result_type result_type; T operator() (const T&, const T&) const; };
Warning
If your compiler does not support default template parameters, you need to always supply the Allocator template argument. For instance, you will need to write :
vector<int, allocator<int> >
instead of :
vector<int>
See Also
binary_function, Function Objects
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