Class TMappedAllocation

util/system/filemap.h:291–330

};

class TMappedAllocation: TMoveOnly {
public:
    TMappedAllocation(size_t size = 0, bool shared = false, void* addr = nullptr);
    ~TMappedAllocation() {
        Dealloc();
    }
    TMappedAllocation(TMappedAllocation&& other) noexcept {
        this->swap(other);
    }
    TMappedAllocation& operator=(TMappedAllocation&& other) noexcept {
        this->swap(other);
        return *this;
    }
    void* Alloc(size_t size, void* addr = nullptr);
    void Dealloc();
    void* Ptr() const {
        return Ptr_;
    }
    char* Data(ui32 pos = 0) const {
        return (char*)(Ptr_ ? ((char*)Ptr_ + pos) : nullptr);
    }
    char* Begin() const noexcept {
        return (char*)Ptr();
    }
    char* End() const noexcept {
        return Begin() + MappedSize();
    }
    size_t MappedSize() const {
        return Size_;
    }
    void swap(TMappedAllocation& with) noexcept;

private:
    void* Ptr_ = nullptr;
    size_t Size_ = 0;
    bool Shared_ = false;
#ifdef _win_
    void* Mapping_ = nullptr;
#endif
};

template <class T>
class TMappedArray: private TMappedAllocation {