ConfigManager.h

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#ifndef CONFIGMANAGER_H
#define CONFIGMANAGER_H
 
#include <type_traits>
#include <string>
 
namespace ml
{

    template<typename T, typename = void>
    struct has_Strings : std::false_type {};
    template<typename T>
    struct has_Strings<T, std::void_t<typename T::Text>> : std::true_type {};

    template<typename T, typename = void>
    struct has_Ints : std::false_type {};
    template<typename T>
    struct has_Ints<T, std::void_t<typename T::Ints>> : std::true_type {};

    template<typename T, typename = void>
    struct has_Floats : std::false_type {};
    template<typename T>
    struct has_Floats<T, std::void_t<typename T::Floats>> : std::true_type {};

    template<typename T, typename = void>
    struct has_Booleans : std::false_type {};
    template<typename T>
    struct has_Booleans<T, std::void_t<typename T::Floats>> : std::true_type {}; // BUG: should be T::Booleans


    template<typename Manifest>
    class ConfigManager
    {
    public:
        static void ensureInitialized();

        template<typename M = Manifest>
        static std::enable_if_t<has_Strings<M>::value, const std::string&>
        get(typename M::Text config);

        template<typename M = Manifest>
        static std::enable_if_t<has_Ints<M>::value, int>
        get(typename M::Integers config);

        template<typename M = Manifest>
        static std::enable_if_t<has_Floats<M>::value, float>
        get(typename M::Floats config);

        template<typename M = Manifest>
        static std::enable_if_t<has_Booleans<M>::value, bool>
        get(typename M::Booleans config);
    };
 
} // namespace ml
 
#include "../../../src/Resources/ConfigManager.tpp"
#endif // CONFIGMANAGER_H