C ++-从字符串变量获取枚举值 [英] C++ - Getting an enumerated value from a string variable

问题描述

我有一个枚举类型，例如

枚举颜色(红色，蓝色，绿色)；

和一个CString test_string ="Blue"

如何通过字符串获取枚举类型的第二个值?

我想去的是:

int retValue =颜色(test_string);

或类似的东西将产生retValue = 1

我不想使用if语句或case语句来完成此操作，因为枚举中大约有100个元素.我还想使它尽可能简单(我不是一个出色的C程序员).

I have an enumerated type such as

enum Colors(Red, Blue, Green);

and a CString test_string = "Blue"

How do I get to the 2nd value in the enumerated type by the string?

What I am trying to get to is:

int retValue = Colors(test_string);

or something like that that will produce retValue = 1

I do not want to use if statements or case statements to accomplish this since I have about 100 elements in the enumeration. I would also like to keep this a simple as possible (I am not a great C programmer).

推荐答案

使用C++，您必须做一些工作(C#，例如轻轻地提供它.)
您最好的选择是(不幸的是，也许...)std::map.

With C++ you have to do some work (C#, for instance gently provides it).
Your best bet is (unfortunately, maybe...) a std::map.

// the enum
enum Color
{
  Red,
  Green,
  Blue
};

// the mapping of the string with the enum
map<CString , Color> m;
m.insert(make_pair<CString, Color>(_T("Red"),Red));
m.insert(make_pair<CString, Color>(_T("Green"),Green));
m.insert(make_pair<CString, Color>(_T("Blue"),Blue));

// usage...
Color c = m[_T("Green")];

无法像您想要的那样在运行时通过字符串访问枚举值.

将所有可能的小数点放在与您的枚举相对应的数组中，并使用循环遍历数组以查找字符串的int值.

There is no way to access the enum value by a string at runtime, like you want.

Put all possible srings in an array corresponding to your enumeration and use a loop to iterate through the array to find the int value for your string.

这种用法也可以考虑:

This usage could be thinkable too:

Colored<CString, Blue> cszString(_T("Blue"));
ASSERT(Blue == cszString.GetColor());

我会在您需要时描述它...:)

I describe it when you will want it... :)

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