multimap::reference
A type that provides a reference to an element stored in a multimap.
typedef typename allocator_type::reference reference;
Example
// multimap_ref.cpp
// compile with: /EHsc
#include <map>
#include <iostream>
int main( )
{
using namespace std;
multimap <int, int> m1;
typedef pair <int, int> Int_Pair;
m1.insert ( Int_Pair ( 1, 10 ) );
m1.insert ( Int_Pair ( 2, 20 ) );
// Declare and initialize a const_reference &Ref1
// to the key of the first element
const int &Ref1 = ( m1.begin( ) -> first );
// The following line would cause an error because the
// non-const_reference cannot be used to access the key
// int &Ref1 = ( m1.begin( ) -> first );
cout << "The key of first element in the multimap is "
<< Ref1 << "." << endl;
// Declare and initialize a reference &Ref2
// to the data value of the first element
int &Ref2 = ( m1.begin( ) -> second );
cout << "The data value of first element in the multimap is "
<< Ref2 << "." << endl;
// The non-const_reference can be used to modify the
// data value of the first element
Ref2 = Ref2 + 5;
cout << "The modified data value of first element is "
<< Ref2 << "." << endl;
}
The key of first element in the multimap is 1. The data value of first element in the multimap is 10. The modified data value of first element is 15.
Requirements
Header: <map>
Namespace: std