C++ examples for STL:map
Compare two map for equality
#include <iostream> #include <string> #include <map> using namespace std; void show(const char *msg, map<string, int> mp); int main() {//from ww w .j av a2 s . com // Declare an empty map that holds key/value pairs // in which the key is a string and the value is an int. map<string, int> m; // Insert characters into m. An iterator to the inserted // object is returned. m.insert(pair<string, int>("Alpha", 100)); m.insert(pair<string, int>("Gamma", 300)); m.insert(pair<string, int>("Beta", 200)); // Declare an iterator to a map<string, itr>. map<string, int>::iterator itr; // Declare a reverse iterator to a map<string, itr>. map<string, int>::reverse_iterator ritr; // Create another map that is the same as the first. map<string, int> m2(m); show("Contents of m2: ", m2); // Compare two maps. if(m == m2) cout << "m and m2 are equivalent.\n\n"; return 0; } // Display the contents of a map<string, int> by using // an iterator. void show(const char *msg, map<string, int> mp) { map<string, int>::iterator itr; cout << msg << endl; for(itr=mp.begin(); itr != mp.end(); ++itr) cout << " " << itr->first << ", " << itr->second << endl; cout << endl; }