negate(3C++) - negate(3C++)
Standard C++ Library Copyright 1998, Rogue Wave Software, Inc.
NAMEnegate
- Unary function object that returns the negation of its argument.
SYNOPSIS
#include <functional>
template <class T>
struct negate : public unary_function<T, T>;
DESCRIPTIONnegate is a unary function object. Its operator() returns the negation
of its argument: true if its argument is false, or false if its argu‐
ment is true. You can pass a negate object to any algorithm that
requires a unary function. For example, the transform algorithm applies
a unary operation to the values in a collection and stores the result.
negate could be used in that algorithm in the following manner:
vector<int> vec1;
vector<int> vecResult;
transform(vec1.begin(), vec1.end(), vecResult.begin(),
negate<int>());
After this call to transform, vecResult(n) contains the negation of the ele‐
ment in vec1(n).
INTERFACEtemplate <;class T>
struct negate : unary_function<;T, T> {
T operator() (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 need 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
Function_Objects, unary_function
Rogue Wave Software 02 Apr 1998 negate(3C++)
