multimap::value_type
Un tipo que representa el tipo de objeto almacenado como elemento en un mapa.
typedef pair<const Key, Type> value_type;
Nota
value_type se declara como pair<const key_type, mapped_type>y no pair<key_type, mapped_type>, porque las claves de un contenedor asociativa no se puede cambiar utilizando un iterador o una referencia que no es una constante.
Ejemplo
// multimap_value_type.cpp
// compile with: /EHsc
#include <map>
#include <iostream>
int main( )
{
using namespace std;
typedef pair <const int, int> cInt2Int;
multimap <int, int> m1;
multimap <int, int> :: key_type key1;
multimap <int, int> :: mapped_type mapped1;
multimap <int, int> :: value_type value1;
multimap <int, int> :: iterator pIter;
// value_type can be used to pass the correct type
// explicitely to avoid implicit type conversion
m1.insert ( multimap <int, int> :: value_type ( 1, 10 ) );
// Compare another way to insert objects into a hash_multimap
m1.insert ( cInt2Int ( 2, 20 ) );
// Initializing key1 and mapped1
key1 = ( m1.begin( ) -> first );
mapped1 = ( m1.begin( ) -> second );
cout << "The key of first element in the multimap is "
<< key1 << "." << endl;
cout << "The data value of first element in the multimap is "
<< mapped1 << "." << endl;
// The following line would cause an error because
// the value_type is not assignable
// value1 = cInt2Int ( 4, 40 );
cout << "The keys of the mapped elements are:";
for ( pIter = m1.begin( ) ; pIter != m1.end( ) ; pIter++ )
cout << " " << pIter -> first;
cout << "." << endl;
cout << "The values of the mapped elements are:";
for ( pIter = m1.begin( ) ; pIter != m1.end( ) ; pIter++ )
cout << " " << pIter -> second;
cout << "." << endl;
}
Requisitos
Encabezado: <map>
Espacio de nombres: std