hash_set::value_type

A type that describes an object stored as an element of a hash_set in its capacity as a value.

typedef Key value_type;

Remark

value_type is a synonym for the template parameter Key.

Note that both key_type and value_type are synonyms for the template parameter Key. Both types are provided for the set and hash_set classes, where they are identical, for compatibility with the map and multimap classes, where they are distinct.

For more information on Key, see the Remarks section of the hash_set Class topic.

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_set_value_type.cpp
// compile with: /EHsc
#include <hash_set>
#include <iostream>

int main( )
{
   using namespace std;
   using namespace stdext;
   hash_set <int> hs1;
   hash_set <int>::iterator hs1_Iter;

   hash_set <int> :: value_type hsvt_Int;   // Declare value_type
   hsvt_Int = 10;             // Initialize value_type

   hash_set <int> :: key_type hskt_Int;   // Declare key_type
   hskt_Int = 20;             // Initialize key_type

   hs1.insert( hsvt_Int );         // Insert value into hs1
   hs1.insert( hskt_Int );         // Insert key into hs1

   // A hash_set accepts key_types or value_types as elements
   cout << "The hash_set has elements:";
   for ( hs1_Iter = hs1.begin( ) ; hs1_Iter != hs1.end( ); hs1_Iter++)
      cout << " " << *hs1_Iter;
   cout << "." << endl;
}

The hash_set has elements: 10 20.

Requirements

Header: <hash_set>

Namespace: stdext

See Also

Reference

hash_set Class

Standard Template Library