如何在C ++中"ToString()"枚举? [英] How do I 'ToString()' an enum in C++?

问题描述

如何在C ++中"ToString()"枚举?

How do I 'ToString()' an enum in C++?

在Java和C#中，我只会调用ToString.

In Java and C# I would just call ToString.

enum Colours
{
    Red =0,
    Green=1,
    Blue=2
};

我需要创建一个字符串，例如:"Invalid color'"+颜色+"已选中."

I need to create a string like: "Invalid colour '" + colour + "' selected."

推荐答案

虽然这通常是通过开关完成的，但我更喜欢数组:

While this is commonly done through switches, I prefer arrays:

#include <iostream>

namespace foo {
  enum Colors { BLUE = 0, RED, GREEN, SIZE_OF_ENUM };
  static const char* ColorNames[] = { "blue", "red", "green" };

  // statically check that the size of ColorNames fits the number of Colors
  static_assert(sizeof(foo::ColorNames)/sizeof(char*) == foo::SIZE_OF_ENUM
    , "sizes dont match");
} // foo

int main()
{
  std::cout << foo::ColorNames[foo::BLUE] << std::endl;
  return 0;
}

显式数组大小具有产生编译时间的好处如果枚举的大小发生变化，则会出错，而您忘记添加适当的字符串.

The explicit array size has the benefit of generating a compile time error should the size of the enum change and you forget to add the appropriate string.

或者，在Boost保管库中还有Boost.Enum.图书馆尚未正式发布，但相当稳定，可以提供你要.我不会推荐给新手.

Alternatively, there is Boost.Enum in the Boost vault. The library hasn't been officially released but is quite stable and provides what you want. I wouldn't recommend it to a novice though.

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