validate integer是一些枚举类项（C ++ 11） [英] validate integer is some enum class item (C++11)

问题描述

我有一些枚举类

enum class Foo { A=1, B=18 , Z=42 };

我想检查一些整数是否可以转换为 Foo 。
什么是理想的方式这样做？这是为运行时检查（整数在编译时还未知）

i want to check if some integer can be converted into a Foo. What would be the ideal way to do this? this is for runtime check (the integer is not known yet at compile-time)

显然，我可以这样做的方式（写一个函数 bool CheckEnum（Foo）; 有一个大屁股开关返回true除了默认的所有情况），但我希望一个更优雅的机制，避免了这么多的写作。 MPL或 Boost.Preprocessor 将是一个完全可以接受的解决方案，但其中一个我不知道很少关于

Obviously i can do this the hard way (write a function bool CheckEnum(Foo); with a big-ass switch returning true for all cases except the default one), but i was hoping a more elegant mechanism that avoided so much writing. MPL or Boost.Preprocessor would be a perfectly acceptable solution, but one of which i sadly know very little about

推荐答案

解决这个问题的办法是删除枚举，并用一些数组替换它们，使用 XMACROs。

A solution to this problem is to ditch the enums, and replace it with some arrays which are created using XMACROs.

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