String to enum in C++

Question

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

The problem is: I have a few enum values stored as string in a text file which I read on

Answer 1

Is this what you want? The initialization is straight, and no instantiation is needed.

usage:

enum SomeEnum
{
    ENUM_ONE,
    ENUM_TWO,
    ENUM_THREE,
    ENUM_NULL
};

DEFINE_PAIRLIST(CEnumMap, SomeEnum)

INIT_PAIRLIST(CEnumMap)=
{
        {"One", ENUM_ONE},
        {"Two", ENUM_TWO},
        {"Three", ENUM_THREE},
        {"", ENUM_NULL}
};

main{
    // Get enum from string
    SomeEnum i = CEnumMap::findValue("One");

    // Get string from enum
    SomeEnum eee = ENUM_ONE;
    const char* pstr = CEnumMap::findKey(eee);
    ...
}

library:

template 
struct CStringPair
{
    const char* _name;
    T _value;
};

template 
struct CStringPairHandle
{
    typedef CStringPair CPair;
    static const CStringPair * getPairList(){
        return Derived::implementation();
    }
    static T findValue(const char* name){
        const CStringPair * p = getPairList();
        for (; p->_name[0]!=0; p++)
            if (strcmp(name,p->_name)==0)
                break;
        return p->_value;
    }

    static const char* findKey(T value){
        const CStringPair * p = getPairList();
        for (; p->_name[0]!=0; p++)
            if (strcmp(value,p->_value)==0)
                break;
        return p->_name;
    };
};

#define DEFINE_PAIRLIST(name, type) struct name:public CStringPairHandle{ \
    static CPair _pairList[];       \
    static CPair* implementation(){     \
        return _pairList;           \
    }};
#define INIT_PAIRLIST(name) name::CPair name::_pairList[]