Question

How to use map nested in map in C++

Answer 1

#include <iostream>
#include <map>
#include <string>

using std::cout;
using std::endl;
using std::map;
using std::string;

int main()
{
	map< int, map<string, double> > nested_map;
	map<string, double> mp;

	mp.emplace("c++", 3.14);
	nested_map.emplace(999, mp);

	map<string, double>::iterator it1;
	map<int, map<string, double> >::iterator it2;

	for (it2 = nested_map.begin(); it2 != nested_map.end(); it2++) 	{
		for (it1 = mp.begin(); it1 != mp.end(); it1++) {
			cout << it2->first << " : " << it1->first << " - " << it1->second;
		}
	}

	cout << endl;

	return 0;
}

/*
run:

999 : c++ - 3.14

*/

 

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