windows-user-space-emulator/src/common/utils/file_handle.hpp

#pragma once

#include <cstdio>
#include <type_traits>

namespace utils
{
	class file_handle
	{
	public:
		file_handle() = default;

		file_handle(FILE* file)
			: file_(file)
		{
		}

		~file_handle()
		{
			this->release();
		}

		file_handle(const file_handle&) = delete;
		file_handle& operator=(const file_handle&) = delete;

		file_handle(file_handle&& obj) noexcept
			: file_handle()
		{
			this->operator=(std::move(obj));
		}

		file_handle& operator=(file_handle&& obj) noexcept
		{
			if (this != &obj)
			{
				this->release();
				this->file_ = obj.file_;
				obj.file_ = {};
			}

			return *this;
		}

		file_handle& operator=(FILE* file) noexcept
		{
			this->release();
			this->file_ = file;

			return *this;
		}

		[[nodiscard]] operator bool() const
		{
			return this->file_;
		}

		[[nodiscard]] operator FILE*() const
		{
			return this->file_;
		}

	private:
		FILE* file_{};

		void release()
		{
			if (this->file_)
			{
				(void)fclose(this->file_);
				this->file_ = {};
			}
		}
	};
}