hash_map::swap
Exchanges the elements of two hash_maps.
void swap(
hash_map& _Right
);
Parameters
- _Right
The argument hash_map providing the elements to be swapped with the target hash_map.
Remarks
The member function invalidates no references, pointers, or iterators that designate elements in the two hash_maps whose elements are being exchanged.
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_map_swap.cpp
// compile with: /EHsc
#define _DEFINE_DEPRECATED_HASH_CLASSES 0
#include <hash_map>
#include <iostream>
int main( )
{
using namespace std;
using namespace stdext;
hash_map <int, int> hm1, hm2, hm3;
hash_map <int, int>::iterator hm1_Iter;
typedef pair <int, int> Int_Pair;
hm1.insert ( Int_Pair ( 1, 10 ) );
hm1.insert ( Int_Pair ( 2, 20 ) );
hm1.insert ( Int_Pair ( 3, 30 ) );
hm2.insert ( Int_Pair ( 10, 100 ) );
hm2.insert ( Int_Pair ( 20, 200 ) );
hm3.insert ( Int_Pair ( 30, 300 ) );
cout << "The original hash_map hm1 is:";
for ( hm1_Iter = hm1.begin( ); hm1_Iter != hm1.end( ); hm1_Iter++ )
cout << " " << hm1_Iter -> second;
cout << "." << endl;
// This is the member function version of swap
// hm2 is said to be the argument hash_map;
// hm1 is said to be the target hash_map
hm1.swap( hm2 );
cout << "After swapping with hm2, hash_map hm1 is:";
for ( hm1_Iter = hm1.begin( ); hm1_Iter != hm1.end( ); hm1_Iter++ )
cout << " " << hm1_Iter -> second;
cout << "." << endl;
// This is the specialized template version of swap
swap( hm1, hm3 );
cout << "After swapping with hm3, hash_map hm1 is:";
for ( hm1_Iter = hm1.begin( ); hm1_Iter != hm1.end( ); hm1_Iter++ )
cout << " " << hm1_Iter -> second;
cout << "." << endl;
}
The original hash_map hm1 is: 10 20 30. After swapping with hm2, hash_map hm1 is: 100 200. After swapping with hm3, hash_map hm1 is: 300.
Requirements
Header: <hash_map>
Namespace: stdext