minus

Library:  General utilities

binary_function     minus

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Function object that returns the result of subtracting its second argument from its first argument

#include <functional>

namespace std {
  template <class T>
  struct minus : public binary_function<T, T, T>;
}

minus is a binary function object. Its operator() returns the result of x minus y. You can pass a minus object to any algorithm that requires a binary function. For example, the transform() algorithm applies a binary operation to corresponding values in two collections and stores the result. minus 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(), minus<int>());

After this call to transform(), vecResult(n) contains vec1(n) minus vec2(n).

namespace std {

  template <class T>
  struct minus : 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