plus

Library:  General utilities

plus  binary_function

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A binary function object that returns the result of adding its first and second arguments

#include <functional>

namespace std {
  template<class T>
  struct plus;
}

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) contains vec1(n) plus vec2(n).

namespace std {

  template<class T>
  struct plus : binary_function<T, T, T> {
    T operator() (const T&, const T&) const;
  };
}

binary_function, Function Objects

ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.2