minus(3C++)

Standard C++ Library
Copyright 1998, Rogue Wave Software, Inc.

NAME

minus

- Returns the result of subtracting its second argument from its first.

SYNOPSIS

#include<functional>
template <class T>
struct minus : public binary_function<T, T, T>;

DESCRIPTION

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).

INTERFACE

template <class T>
struct minus : binary_function<T, T, T> {

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

};

WARNINGS

If your compiler does not support default template parameters, then you always need to supply the Allocator template argument. For instance, you have to write:

vector<int, allocator<int> >

instead of:

vector<int>

If your compiler does not support namespaces, then you do not need the using declaration for std.