StringName.hpp

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/* This file is part of Berserk Engine project                                    */
/* https://github.com/EgorOrachyov/Berserk                                        */
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/* Copyright (c) 2018 - 2021 Egor Orachyov                                        */
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#ifndef BERSERK_STRINGNAME_HPP
#define BERSERK_STRINGNAME_HPP
 
#include <core/Config.hpp>
#include <core/Typedefs.hpp>
#include <core/string/String.hpp>
#include <core/templates/Ref.hpp>
#include <core/templates/RefCnt.hpp>
 
#include <mutex>
#include <ostream>
#include <unordered_map>
#include <utility>
 
BRK_NS_BEGIN
 
class StringName {
public:
    BRK_API explicit StringName(const String &str = String());
 
    StringName(const StringName &other);
 
    StringName(StringName &&other) noexcept;
 
    BRK_API ~StringName();
 
    BRK_API StringName &operator=(const StringName &other);
 
    BRK_API StringName &operator=(StringName &&other) noexcept;
 
    BRK_API bool operator==(const StringName &other) const;
 
    BRK_API bool operator!=(const StringName &other) const;
 
    BRK_API const String &GetStr() const;
 
    BRK_API size_t GetHash() const;
 
private:
    class Node : public RefCnt {
    public:
        explicit Node(String str) : mString(std::move(str)), mHash(std::hash<String>{}(mString)) {}
        const String &GetStr() const { return mString; }
        size_t GetHash() const { return mHash; }
 
    private:
        String mString;
        size_t mHash;
    };
 
    void Release();
 
    Ref<Node> mNode;
 
private:
    static std::mutex &GetAccessMutex();
    static std::unordered_map<String, Ref<Node>> &GetCachedNames();
};
 
BRK_NS_END
 
namespace std {
 
    template<>
    struct hash<BRK_NS::StringName> {
    public:
        std::size_t operator()(const BRK_NS::StringName &stringName) const {
            return stringName.GetHash();
        }
    };
 
}// namespace std
 
inline std::ostream &operator<<(std::ostream &stream, const BRK_NS::StringName &name) {
    stream << name.GetStr();
    return stream;
}
 
#endif//BERSERK_STRINGNAME_HPP