#include <map> #include <iostream> using namespace std; int main( ) { map <int, int> m1, m2, m3; map <int, int>::iterator m1_Iter; m1.insert ( pair <int, int> ( 1, 10 ) ); m1.insert ( pair <int, int> ( 2, 20 ) ); m1.insert ( pair <int, int> ( 3, 30 ) ); m2.insert ( pair <int, int> ( 10, 100 ) ); m2.insert ( pair <int, int> ( 20, 200 ) ); m3.insert ( pair <int, int> ( 30, 300 ) ); cout << "The original map m1 is:"; for ( m1_Iter = m1.begin( ); m1_Iter != m1.end( ); m1_Iter++ ) cout << " " << m1_Iter->second; cout << "." << endl; // This is the member function version of swap //m2 is said to be the argument map; m1 the target map m1.swap( m2 ); cout << "After swapping with m2, map m1 is:"; for ( m1_Iter = m1.begin( ); m1_Iter != m1.end( ); m1_Iter++ ) cout << " " << m1_Iter -> second; cout << "." << endl; cout << "After swapping with m2, map m2 is:"; for ( m1_Iter = m2.begin( ); m1_Iter != m2.end( ); m1_Iter++ ) cout << " " << m1_Iter -> second; cout << "." << endl; // This is the specialized template version of swap swap( m1, m3 ); cout << "After swapping with m3, map m1 is:"; for ( m1_Iter = m1.begin( ); m1_Iter != m1.end( ); m1_Iter++ ) cout << " " << m1_Iter -> second; cout << "." << endl; }
#include <map> #include <iostream> using namespace std; int main( ) { map <int, int> m1; map <int, int>::iterator m1_Iter; m1.insert ( pair <int, int> ( 1, 20 ) ); m1.insert ( pair <int, int> ( 4, 40 ) ); m1.insert ( pair <int, int> ( 3, 60 ) ); m1.insert ( pair <int, int> ( 2, 50 ) ); m1.insert ( pair <int, int> ( 6, 40 ) ); m1.insert ( pair <int, int> ( 7, 30 ) ); cout << "The original map m1 is:"<<endl; for ( m1_Iter = m1.begin( ); m1_Iter != m1.end( ); m1_Iter++ ) cout << m1_Iter->first<<" "<<m1_Iter->second<<endl; }
原文:https://www.cnblogs.com/ljy-endl/p/11403910.html