MRUniqueThreadSafeOwner.h

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#pragma once
 
#include "MRMeshFwd.h"
#include <functional>
#include <mutex>
#include <memory>
 
namespace MR
{
 
struct TaskGroup;
 
 
template<typename T>
class UniqueThreadSafeOwner
{
public:
    MRMESH_API UniqueThreadSafeOwner();
    MRMESH_API UniqueThreadSafeOwner( const UniqueThreadSafeOwner& );
    MRMESH_API UniqueThreadSafeOwner& operator =( const UniqueThreadSafeOwner& );
    MRMESH_API UniqueThreadSafeOwner( UniqueThreadSafeOwner&& b ) noexcept;
    MRMESH_API UniqueThreadSafeOwner& operator =( UniqueThreadSafeOwner&& b ) noexcept;
    MRMESH_API ~UniqueThreadSafeOwner();
 
    MRMESH_API void reset();
    T * get() { return obj_.get(); }
    MRMESH_API T & getOrCreate( const std::function<T()> & creator );
    MRMESH_API void update( const std::function<void(T&)> & updater );
    [[nodiscard]] MRMESH_API size_t heapBytes() const;
 
private:
    mutable std::mutex mutex_;
    std::unique_ptr<T> obj_;
    std::shared_ptr<TaskGroup> construction_;
};
 
 
} // namespace MR