在 C++ 中枚举的字符串

2021-12-29 00:00:00 string enums c++

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:我有一些枚举值作为字符串存储在一个文本文件中，我在满足某些条件时即时读取这些值......现在我想将读取值分配给一个枚举.

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?它不需要是最简单的方法.

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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