[C++]How to use erase of std map correctly

Origin Text: http://www.cnblogs.com/graphics/archive/2010/07/05/1771110.html #include <iostream> #include <map> #include <string> using namespace std ; int main(void) { map<int, string> m ; m.insert(pair<int, string>(1, "abc")) ; m.insert(pair<int, string>(2, "def")) ; m.insert(pair<int, string>(3, "def")) ; m.insert(pair<int, string>(4, "ghi")) ; map<int, string>::iterator itor ; // Print m map<int, string>::const_iterator citor ; for (citor = m.begin(); citor != m.end(); ++citor) { cout << cit...