在C ++中枚举的字符串 [英] String to enum in C++

问题描述

有没有办法将文本文件中的字符串与枚举值相关联？

Is there a way to associate a string from a text file with an enum value?

问题是：我有一些枚举值存储为一个文本文件中的字符串，我在飞行中读取满足一些条件...现在我想分配读取值到枚举。

The problem is: I have a few enum values stored as string in a text file which I read on the fly on meeting some condition... Now I want to assign the read value to an enum.

最有效的方法是什么？

What is the most effective way to do so? It doesn't need to be the simplest approach.

推荐答案

您可以设置一个可以反复使用的地图：

You can set up a map that you can use over and over:

template <typename T>
class EnumParser
{
    map <string, T> enumMap;
public:
    EnumParser(){};

    T ParseSomeEnum(const string &value)
    { 
        map <string, T>::const_iterator iValue = enumMap.find(value);
        if (iValue  == enumMap.end())
            throw runtime_error("");
        return iValue->second;
    }
};

enum SomeEnum
{
    Value1,
    Value2
};
EnumParser<SomeEnum>::EnumParser()
{
    enumMap["Value1"] = Value1;
    enumMap["Value2"] = Value2;
}

enum OtherEnum
{
    Value3, 
    Value4
};
EnumParser<OtherEnum>::EnumParser()
{
    enumMap["Value3"] = Value3;
    enumMap["Value4"] = Value4;
}

int main()
{
    EnumParser<SomeEnum> parser;
    cout << parser.ParseSomeEnum("Value2");
}

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