字符串作为键和类型作为值的C ++映射

Question

Is there an alternative to boost-hana in boost library which will allow me to create something like

typedef boost::AlterinativeToHana::map< make_pair<"abcd",ABCDType>,
                 make_pair<"efgh",EFGHType>,
                 make_pair<"ijkl",IJKLType>
               > stringToTypeMap;

I have used boost-fusion , but I could not find a proper solution for my use case ie character string to type mapping.

Answer 1

I think std::type_index is what you need:

#include <iostream>
#include <typeindex>
#include <map>

class A
{};

class B
{};

int main()
{   
    std::map<std::type_index, std::string> typesMap;
    typesMap[typeid(A)] = "1111";
    typesMap[typeid(B)] = "2222";

    A instA;
    B instB;

    cout << "instA: " << typesMap[typeid(instA)] << "\n";
    cout << "instB: " << typesMap[typeid(instB)] << "\n";

    return 0;
}

Output:

instA: 1111
instB: 2222