multiplies(3C++) - multiplies(3C++)
Standard C++ Library Copyright 1998, Rogue Wave Software, Inc.
NAMEmultiplies
- A binary function object that returns the result of multiplying its
first and second arguments.
SYNOPSIS
#include<functional>
template <class T>
struct multiplies : binary_function<T, T, T> {
T operator() (const T&, const T&) const;
};
DESCRIPTIONmultiplies is a binary function object. Its operator() returns the
result of multiplying x and y. You can pass a multiplies object to any
algorithm that uses a binary function. For example, the transform algo‐
rithm applies a binary operation to corresponding values in two collec‐
tions and stores the result. multiplies would be used in that algo‐
rithm in the following manner:
vector<int> vec1;
vector<int> vec2;
vector<int> vecResult;
transform(vec1.begin(), vec1.end(),<br> vec2.begin(),
vec2.end(),<br> vecResult.begin(), multiplies<int>());
After this call to transform, vecResult(n) contains vec1(n) times
vec2(n).
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.
SEE ALSO
binary_function, Function_Objects
Rogue Wave Software 02 Apr 1998 multiplies(3C++)
