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.
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如何ToString()在c ++中的枚举?
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