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hash_multiset::find

Returns an iterator addressing the location of an element in a hash_multiset that has a key equivalent to a specified key.

iterator find(
   const Key& _Key
);
const_iterator find(
   const Key& _Key
) const;

Parameters

  • _Key
    The argument key to be matched by the sort key of an element from the hash_multiset being searched.

Return Value

An iterator or const_iterator that addresses the location of an element equivalent to a specified key or that addresses the location succeeding the last element in the hash_multiset if no match is found for the key.

Remarks

The member function returns an iterator that addresses an element in the hash_multiset whose sort key is equivalent to the argument key under a binary predicate that induces an ordering based on a less-than comparability relation.

If the return value of find is assigned to a const_iterator, the hash_multiset object cannot be modified. If the return value of find is assigned to an iterator, the hash_multiset object can be modified.

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_find.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> hms1;
   hash_multiset <int> :: const_iterator hms1_AcIter, hms1_RcIter;
   
   hms1.insert( 10 );
   hms1.insert( 20 );
   hms1.insert( 30 );

   hms1_RcIter = hms1.find( 20 );
   cout << "The element of hash_multiset hms1 with a key of 20 is: "
        << *hms1_RcIter << "." << endl;

   hms1_RcIter = hms1.find( 40 );

   // If no match is found for the key, end( ) is returned
   if ( hms1_RcIter == hms1.end( ) )
      cout << "The hash_multiset hms1 doesn't have an element "
           << "with a key of 40." << endl;
   else
      cout << "The element of hash_multiset hms1 with a key of 40 is: "
           << *hms1_RcIter << "." << endl;

   // The element at a specific location in the hash_multiset can be found 
   // by using a dereferenced iterator addressing the location
   hms1_AcIter = hms1.end( );
   hms1_AcIter--;
   hms1_RcIter = hms1.find( *hms1_AcIter );
   cout << "The element of hms1 with a key matching "
        << "that of the last element is: "
        << *hms1_RcIter << "." << endl;
}
The element of hash_multiset hms1 with a key of 20 is: 20.
The hash_multiset hms1 doesn't have an element with a key of 40.
The element of hms1 with a key matching that of the last element is: 30.

Requirements

Header: <hash_set>

Namespace: stdext

See Also

Reference

hash_multiset Class

Standard Template Library

Other Resources

hash_multiset Members