C++ Template for mapping struct type to enum?

Question

I have something like:

struct A { ... };
struct B { ... };
struct C { ... };

class MyEnum {
public:
    enum Value { a, b, c; }
}

template

        

Answer 1

You can map types to enums at compile time:

#include 

struct A { int n; };
struct B { double f; };
struct C { char c; };

class MyEnum
{
public:
    enum Value { a, b, c };
};

template struct StructToMyEnum {};

template<> struct StructToMyEnum {enum {Value = MyEnum::a};};
template<> struct StructToMyEnum {enum {Value = MyEnum::b};};
template<> struct StructToMyEnum {enum {Value = MyEnum::c};};

int main (int argc, char* argv[])
{
    std::cout << "A=" << StructToMyEnum::Value << std::endl;
    return 0;
}