如何ToString（）在c ++中的枚举？

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我如何ToString（）在c ++中的枚举？在Java和C＃中，我只调用ToString。

How do i ToString() an enum in c++? 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：Invalid color'+ color +'selected。

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

推荐答案

虽然这通常是通过交换机完成的，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; }

显式数组大小有利于生成编译时间

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，Boost存储库中有Boost.Enum。库尚未正式发布，但是相当稳定，并提供你想要的。但我不会推荐给新手。

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.