#include <iostream>
#include <map>
using std::cout;
using std::endl;
class User
{
public:
User() {}
User(const std::string& firstname, const std::string& lastname)
: _firstname(firstname), _lastname(lastname) {}
// read-only access methods for private members (Java: getter methods)
const std::string& firstname() const { return _firstname; }
const std::string& lastname() const { return _lastname; }
private:
std::string _firstname;
std::string _lastname;
};
int main()
{
User joerg("Joerg", "Faschingbauer");
std::string joerg_svnr = "1037190666";
User caro("Caro", "Faschingbauer");
std::string caro_svnr = "1234250497";
User johanna("Johanna", "Faschingbauer");
std::string johanna_svnr = "2345110695";
User philipp("Philipp", "Lichtenberger");
std::string philipp_svnr = "3456060486";
User datenzwilling_von_joerg("Joerg", "Faschingzwilling");
std::multimap<std::string, User> meine_map;
meine_map.insert(std::make_pair(joerg_svnr, joerg));
meine_map.insert(std::make_pair(caro_svnr, caro));
meine_map.insert(std::make_pair(johanna_svnr, johanna));
cout << "initial content:" << endl;
for (auto elem: meine_map)
cout << " Key: " << elem.first << ", Value: " << elem.second.firstname() << ',' << elem.second.lastname() << endl;
meine_map.insert(std::make_pair(joerg_svnr, datenzwilling_von_joerg));
cout << "nun haben wir einen datenzwilling:" << endl;
for (auto elem: meine_map)
cout << " Key: " << elem.first << ", Value: " << elem.second.firstname() << ',' << elem.second.lastname() << endl;
std::multimap<std::string, User>::const_iterator found = meine_map.find(joerg_svnr);
cout << "found for key " << joerg_svnr << " (using multimap<>.find()) " << endl;
while (found != meine_map.end() && found->first == joerg_svnr) {
cout << "Key: " << found->first << ", Value: " << found->second.firstname() << ',' << found->second.lastname() << endl;
found++;
}
{
cout << "found for key " << joerg_svnr << " (using multimap<>.equal_range()) " << endl;
// now switching to auto of C++11
// std::pair<std::multimap<std::string, User>::const_iterator, std::multimap<std::string, User>::const_iterator> found_range = meine_map.equal_range(joerg_svnr);
auto found_range = meine_map.equal_range(joerg_svnr);
auto start = found_range.first;
auto end = found_range.second;
while (start != end) {
cout << "Key: " << start->first << ", Value: " << start->second.firstname() << ',' << start->second.lastname() << endl;
start++;
}
}
{
std::string svnr_notexist = "1234567";
cout << "not found for key " << svnr_notexist << " (using multimap<>.equal_range()) " << endl;
auto found_range = meine_map.equal_range(joerg_svnr);
auto start = found_range.first;
auto end = found_range.second;
if (start == end)
cout << svnr_notexist << " not found" << endl;
}
return 0;
}
