59 lines
2.1 KiB
C++
59 lines
2.1 KiB
C++
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#pragma once
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#include <functional>
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#include <memory>
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#include <optional>
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#include <unordered_map>
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#include "imaging/PixelariumImage.hpp"
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namespace pixelarium::resources
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{
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struct IResource
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{
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virtual ~IResource() = 0;
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};
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template <typename R>
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concept ResT = requires(R& r) { static_cast<IResource&>(r); };
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// template <ResT R>
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template <typename R>
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class IResourcePool
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{
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public:
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virtual ~IResourcePool() = default;
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virtual std::optional<const R*> GetResource(size_t id) const = 0;
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virtual size_t SetResource(std::unique_ptr<R> res) = 0;
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virtual bool UpdateResource(size_t id, std::unique_ptr<R> res) = 0;
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virtual bool DeleteResource(size_t id) = 0;
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virtual void EnumerateResources(const std::function<void(size_t, const R&)>& func) = 0;
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};
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// Now with the =GetResource= method, I do not want to transfer ownership to the caller of that method. The ownership
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// should still
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// reside with the =ResourcePool=!
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// In fact, the intention is, that there is no way back once the =ResourcePool= took ownership of an object.
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// Callers can get references, but no ownership. A caller might delete a resource though.
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class ImageResourcePool : public IResourcePool<imaging::PixelariumImage>
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{
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public:
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ImageResourcePool() = default;
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ImageResourcePool(ImageResourcePool&) = delete;
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ImageResourcePool(const ImageResourcePool&) = delete;
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ImageResourcePool(ImageResourcePool&&) = delete;
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ImageResourcePool& operator=(ImageResourcePool&) = delete;
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ImageResourcePool& operator=(ImageResourcePool&&) = delete;
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std::optional<const imaging::PixelariumImage*> GetResource(size_t id) const override;
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size_t SetResource(std::unique_ptr<imaging::PixelariumImage> res) override;
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bool UpdateResource(size_t id, std::unique_ptr<imaging::PixelariumImage> res) override;
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bool DeleteResource(size_t id) override;
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void EnumerateResources(const std::function<void(size_t, const imaging::PixelariumImage&)>& func) override;
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private:
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std::unordered_map<size_t, std::unique_ptr<imaging::PixelariumImage>> resources_;
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};
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} // namespace pixelarium::resources
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