Program Listing for File convertible.h

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#pragma once

#include "playback/resource-info/detail/type-registry.h"

#include <type_traits>

namespace gpa {
namespace playback {
namespace detail {

template<typename BaseType, typename... DerivedTypes>
class Convertible
{
public:
    virtual ~Convertible() = 0;

    inline virtual TypeId GetTypeId() const
    {
        return 0;
    }

    template<typename DerivedType>
    inline DerivedType const* As() const
    {
        static_assert(
            std::is_base_of<BaseType, DerivedType>::value,
            "As<>() may only be used with derived types");
        return GetTypeId() == GetTypeId<DerivedType>() ? (DerivedType const*)this : nullptr;
    }

    template<typename DerivedType>
    inline DerivedType* As()
    {
        static_assert(
            std::is_base_of<BaseType, DerivedType>::value,
            "As<>() may only be used with derived types");
        return GetTypeId() == GetTypeId<DerivedType>() ? (DerivedType*)this : nullptr;
    }

    template<typename DerivedType, typename ProcessAsFunctionType>
    inline bool ProcessAs(ProcessAsFunctionType processAsFunction) const
    {
        auto pDerived = this->As<DerivedType>();
        if (pDerived) {
            processAsFunction(*pDerived);
        }
        return pDerived != nullptr;
    }

    template<typename DerivedType>
    inline static constexpr TypeId GetTypeId()
    {
        static_assert(
            std::is_base_of<BaseType, DerivedType>::value,
            "GetTypeId<>() may only be used with derived types");
        return detail::GetTypeId<DerivedType>(TypeRegistry<DerivedTypes...>{});
    }
};

template<typename BaseType, typename... DerivedTypes>
inline Convertible<BaseType, DerivedTypes...>::~Convertible()
{
}

}  // namespace detail
}  // namespace playback
}  // namespace gpa