project-kyoku/include/tools/resourceholder.h

#pragma once

#include <memory>
#include <map>

namespace sf { class Texture; class Font; }

template <typename Resource, typename Id>
class ResourceHolder
{
public:
    bool load(Id id, const std::string& filename)
    {
        auto resource = std::make_unique<Resource>();
        if (!resource->loadFromFile(filename))
            return false;

        _resources[id] = std::move(resource);

        return true;
    }

    const std::shared_ptr<Resource>& get(Id id) const
    {
        const auto found = _resources.find(id);
        return found->second;
    }

private:
    std::map<Id, std::shared_ptr<Resource>> _resources;
};

namespace Fonts
{
    enum class Id
    {
        GUI
    };
}

using FontHolder = ResourceHolder<sf::Font, Fonts::Id>;