[Boost-users] printing data sorted based on a specific key in boost multi-index container

10 Oct 2008

      Hi Joaquin,

Supposing I have a container having three unique keys,  Is there a way
I can print data sorted by one of they keys?
At the moment I tried a raw dump - it shows fields based on the first
key (which is key1).

Thanks
Ramesh

----

typedef multi_index_container<
  MyMap,
	indexed_by<
		ordered_unique<
			tag <Key1>, BOOST_MULTI_INDEX_MEMBER(MyMap,std::string,Key1)>,
		ordered_non_unique<
	      		tag<Key2>,BOOST_MULTI_INDEX_MEMBER(MyMap,unsigned long,Key2)>,	
	      	ordered_unique<
	      		tag<Key3>,BOOST_MULTI_INDEX_MEMBER(MyMap,unsigned long,Key3)>
	>
...
tMyMap;
class MyContainer {

	private:
		tMyMap		MapObj;
	public:
		Show(){
			for (MyMap::iterator it = MyContainer.begin(), itend =
MyContainer.end(); it != itend;++it) {
				cout << it->Key1;
				cout << it->Key2;
				cout << it->Key3;
			}
		}
};

main() {

MyContainer M;

// Assuming I have data inserted in the container like
// ("Id 4", 10, 10)
// ("Id 1", 10, 40)
// ("Id 5", 30, 60)

M.Show()

// The result is as below:

//("Id 5", 30, 60)
// ("Id 1", 10, 40)
// ("Id 4", 10, 10)

}