StringInterner.hpp

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#pragma once
 
#include <string>
#include <string_view>
#include <unordered_set>
 
#ifdef FSMGINE_MULTI_THREADED
#include <mutex>
#endif
 
 
namespace fsmgine {
 
class StringInterner {
public:
    static StringInterner& instance();
    
    std::string_view intern(const std::string& str);
    
    std::string_view intern(std::string_view sv);
    
    void clear();
 
private:
    StringInterner() = default;
    ~StringInterner() = default;
    StringInterner(const StringInterner&) = delete;
    StringInterner& operator=(const StringInterner&) = delete;
 
    std::unordered_set<std::string> interned_strings_;
    
#ifdef FSMGINE_MULTI_THREADED
    mutable std::mutex mutex_;
#endif
};
 
} // namespace fsmgine