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48 lines
1.1 KiB
C++
48 lines
1.1 KiB
C++
#pragma once
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#include <unordered_map>
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#include <string>
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#include <memory>
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#include <stdexcept>
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namespace engine {
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template <class T>
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class ResourceManager {
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public:
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ResourceManager() {}
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virtual ~ResourceManager() {}
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ResourceManager(const ResourceManager&) = delete;
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ResourceManager& operator=(const ResourceManager&) = delete;
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std::shared_ptr<T> add(const std::string& name, std::unique_ptr<T>&& resource)
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{
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if (m_resources.contains(name) == false) {
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std::shared_ptr<T> ptr = std::move(resource);
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m_resources.emplace(name, ptr);
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}
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else {
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throw std::runtime_error("Cannot add a resource which already exists");
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}
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return m_resources.at(name).lock();
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}
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std::shared_ptr<T> get(const std::string& name)
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{
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if (m_resources.contains(name)) {
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std::weak_ptr<T> resource = m_resources.at(name);
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if (resource.expired() == false) {
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return resource.lock();
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}
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}
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return {};
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}
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private:
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// weak ptrs are used to check a resource's use count. If the use count of a resource hits 0, the resource can safely be deleted.
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std::unordered_map<std::string, std::weak_ptr<T>> m_resources{};
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};
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} |