C++14 using auto keyword in a method's definition

Question

I have several std::unordered_maps. They all have an std::string as their key and their data differs. I want to make a csv string from a given map\'s k

Answer 1

Why not just use a template?

template 
std::string myClass::GetCollection(TMap &myMap) {
    std::vector  tmpVec;
    for ( auto& elem : myMap) {
        tmpVec.push_back(elem.first);
    }
    std::stringstream ss;
    for ( auto& elem : tmpVec ) {
        ss << elem <<',';
    }
    std::string result=ss.str();
    result.pop_back(); //remove the last ','
    return result;
}

Your method is exactly the same, but instead of the auto keyword, we use template function syntax to handle the type inference.