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Cpp filesystem库 枚举文件初体验

用上了filesystem(我家VS2015当时还不是Cpp17,自然是在experiment的namespace里面啦)

文件操作突然变得异常简单。顺带用了lambda,用起来也是特别舒服。

(完了感觉自己再也不会写c了怎么办OAO)