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not_equal_to



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not_equal_to


Function Object

Summary

Binary function object that returns true if its first argument is not equal to its second.

Data Type and Member Function Indexes
(exclusive of constructors and destructors)

None

Synopsis

#include <functional>

template <class T>
struct not_equal_to : public binary_function<T, T, bool> ;

Description

not_equal_to is a binary function object. Its operator() returns true if x is not equal to y. You can pass a not_equal_to 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. not_equal_to 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(), not_equal_to<int>());

After this call to transform, vecResult(n) will contain a "1" if vec1(n) was not equal to vec2(n) or a "1" if vec1(n) was equal to vec2(n).

Interface

template <class T>
struct not_equal_to : binary_function<T, T, bool> {
  typedef typename binary_function<T, T, bool>::second_argument_type  
                                                second_argument_type;
  typedef typename binary_function<T, T, bool>::first_argument_type
                                                first_argument_type;
  typedef typename binary_function<T, T, bool>::result_type 
                                                result_type;
  bool operator() (const T&, const T&) const;
};

Warning

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

vector<int, allocator<int> >

instead of :

vector<int>

See Also

binary_function, Function Objects


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