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
#define _DEFINE_DEPRECATED_HASH_CLASSES 0
#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