RAII 文件与资源管理器 | C++
本章覆盖：文件句柄 / FILE* / OS handle 抽象；constructor acquire；destructor release；move-only type；deleted copy；noexcept move；error handling；resource leak test；early return；exception safety；Rule of Five vs Rule of Zero 的取舍。
本章知识点
- 文件句柄 / FILE* / OS handle 抽象
- constructor acquire
- destructor release
- move-only type
- deleted copy
- noexcept move
- error handling
- resource leak test
- early return
- exception safety
- Rule of Five vs Rule of Zero 的取舍