asset_type_loader.hpp

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#pragma once
#include <klib/assert.hpp>
#include <le2d/asset/asset.hpp>
#include <le2d/util.hpp>
#include <gsl/pointers>
#include <memory>
#include <string_view>
#include <typeindex>
 
namespace le {
namespace detail {
class IAssetTypeLoaderBase : public klib::Polymorphic {
  public:
    [[nodiscard]] virtual auto type_name() const -> std::string_view = 0;
    [[nodiscard]] virtual auto type_index() const -> std::type_index = 0;
    [[nodiscard]] virtual auto load_base(std::string_view uri) const -> std::unique_ptr<IAsset> = 0;
};
} // namespace detail
 
template <std::derived_from<IAsset> AssetTypeT>
class IAssetTypeLoader : public detail::IAssetTypeLoaderBase {
  public:
    [[nodiscard]] virtual auto load_asset(std::string_view uri) const -> std::unique_ptr<AssetTypeT> = 0;
 
  private:
    [[nodiscard]] auto type_name() const -> std::string_view final { return util::demangled_name<AssetTypeT>(); }
    [[nodiscard]] auto type_index() const -> std::type_index final { return std::type_index{typeid(AssetTypeT)}; }
    [[nodiscard]] auto load_base(std::string_view uri) const -> std::unique_ptr<IAsset> final { return load_asset(uri); }
};
} // namespace le