Question

im coming from PHP where i would do

$um['Im a string'][1] = 3;

for a 2d associative array where the first key is a string, the second an integer and the value is an integer as well. I try to do the same in c++. here is my attempt:

// experiment.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <unordered_map>
#include <vector>
#include <string>

using std::vector;
using std::string;
using std::unordered_map;

int _tmain(int argc, _TCHAR* argv[])
{

    unordered_map <string,vector<int,int>> um;

    um["Im a string"][1] = 3;
    printf("Out: %d", um["Im a string"][1]);
    return 0;
}

obviously its not the right syntax;

Answer 1

vector<int,int> isn’t correct (vector isn’t an associative container), you probably want a nested unordered_map<int>. So:

unordered_map <string,unordered_map<int,int>> um;