alg49.c

随书源码.新手学习不错的代码练习代码。多多指教。

#include <algorithm>
#include <vector>
#include <iostream.h>
	
/* generates:
   original element sequence of first container:
   0 1 2 3 4 5 6 7 8 9 
   original element sequence of second container:
   5 6 7 8 9 
   array after swap_ranges() in middle of array:
   5 6 7 8 9 0 1 2 3 4 
   first container after swap_ranges() of two vectors:
   5 6 7 8 9 5 6 7 8 9 
   second container after swap_ranges() of two vectors:
   0 1 2 3 4 
*/
int main()
{
	int ia[]  = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
	int ia2[] = { 5, 6, 7, 8, 9 };
		
	vector< int, allocator > vec( ia, ia+10 );
	vector< int, allocator > vec2( ia2, ia2+5 );

	ostream_iterator< int >  ofile( cout, " " );
		
        cout << "original element sequence of first container:\n";
        copy( vec.begin(), vec.end(), ofile ); cout << '\n';

	cout << "original element sequence of second container:\n";
        copy( vec2.begin(), vec2.end(), ofile ); cout << '\n';

	// swap within the same sequence
	swap_ranges( &ia[0], &ia[5], &ia[5] );

        cout << "array after swap_ranges() in middle of array:\n";
        copy( ia, ia+10, ofile ); cout << '\n';

	// swap across containers
	vector< int, allocator >::iterator last = 
		find( vec.begin(), vec.end(), 5 );

	swap_ranges( vec.begin(), last, vec2.begin() );

        cout << "first container after swap_ranges() of two vectors:\n";
        copy( vec.begin(), vec.end(), ofile ); cout << '\n';

        cout << "second container after swap_ranges() of two vectors:\n";
        copy( vec2.begin(), vec2.end(), ofile ); cout << '\n';
}