Notes on index and key-type deduction

Minimal Working Example

#include "Enumerate.h"#include <iostream>#include <vector>#include <map>#include <string>int main(int argc, char** argv) {    std::vector<int> myVec({10,9,8,7,6,5,4,3,2,1});    // Capture index and value    for(const auto& [i, n] : enumerate(myVec)){        std::cout << "index: " << i << " value: " << n << std::endl;                // n is mutable        ++n; // will increase all values in the list after printing    }    std::map<std::string, int> map{{"a", 10}, {"b", 9},{"c", 7}, {"d", 8}};        // Capture just the index    for(size_t index : enumerate(map)) {        // index for key-value pair as if it was sequential        std::cout << "index: " << index << std::endl;    }        // Capture just the key    for(std::string key : enumerate(map)) {        // the resolved value type has to be the same as the map's key type        std::cout << "key: " << key << std::endl;    }        // Capture the index and the items    for(const auto& [index, item] : enumerate(map)) {        // Decompose the item into keys and values        const auto& [key, value] = item;        std::cout << "index: " << index << " key: " << key << std::endl;    }}