hash_multiset::value_comp
Retrieves a copy of the comparison object used to order element values in a hash_multiset.
value_compare value_comp( ) const;
Return Value
Returns the hash_multiset template parameter Traits, which contains function objects that are used to hash and to order elements of the container.
For more information on Traits see the hash_multiset Class topic.
Remarks
The stored object defines a member function:
bool operator(const Key& _xVal, const Key& _yVal);
which returns true if _xVal precedes and is not equal to _yVal in the sort order.
Note that both key_compare and value_compare are synonyms for the template parameter Traits. Both types are provided for the hash_multiset and hash_multiset classes, where they are identical, for compatibility with the hash_map and hash_multimap classes, where they are distinct.
In Visual C++ .NET 2003, members of the <hash_map> and <hash_set> header files are no longer in the std namespace, but rather have been moved into the stdext namespace. See The stdext Namespace for more information.
Example
// hash_multiset_value_comp.cpp
// compile with: /EHsc
#define _DEFINE_DEPRECATED_HASH_CLASSES 0
#include <hash_set>
#include <iostream>
int main( )
{
using namespace std;
using namespace stdext;
hash_multiset <int, hash_compare < int, less<int> > > hms1;
hash_multiset <int, hash_compare < int, less<int> > >::value_compare
vc1 = hms1.value_comp( );
bool result1 = vc1( 2, 3 );
if( result1 == true )
{
cout << "vc1( 2,3 ) returns value of true, "
<< "where vc1 is the function object of hms1."
<< endl;
}
else
{
cout << "vc1( 2,3 ) returns value of false, "
<< "where vc1 is the function object of hms1."
<< endl;
}
hash_multiset <int, hash_compare < int, greater<int> > > hms2;
hash_multiset<int, hash_compare < int, greater<int> > >::
value_compare vc2 = hms2.value_comp( );
bool result2 = vc2( 2, 3 );
if( result2 == true )
{
cout << "vc2( 2,3 ) returns value of true, "
<< "where vc2 is the function object of hms2."
<< endl;
}
else
{
cout << "vc2( 2,3 ) returns value of false, "
<< "where vc2 is the function object of hms2."
<< endl;
}
}
vc1( 2,3 ) returns value of true, where vc1 is the function object of hms1. vc2( 2,3 ) returns value of false, where vc2 is the function object of hms2.
Requirements
Header: <hash_set>
Namespace: stdext