How to access enum present as a template class member in another namespace?

Question

I'm working on c++, following is my template class:

namespace My{    
template<class config>
class BasicValue
{
public:
    enum Type
    {
        NULL_TYPE = 0,
        OBJECT_TYPE,
        ARRAY_TYPE,
        STRING_TYPE,
        BOOL_TYPE,
        INT_TYPE,
        REAL_TYPE,
    }; // Type
};// BasicValue

}// My

Now, Im accessing this "Type" enum from another .cpp file. Im getting following compilation error for all enum types:

error: ‘STRING_TYPE’ was not declared in this scope

How I can use this enum outside the "My" namespace?

Following is the code usage, Im using the enum value in switch case:

void printValue(const Value& val, int space)
{    
    int sp = space;
    switch(val.type())
    {
        case STRING_TYPE:
            break;
        case BOOL_TYPE:
            break;
        case INT_TYPE:
            break;
        case REAL_TYPE:
            break;
        default:
            exit(-1);
    }
}

Please show us the code that tries to access `STRING_TYPE`. Provide this in a small example that can compile. — tillaert, Jul 17 '14 at 06:09
3 things wrong: having the `enum` as a class member does not reflect its use; having the values named in all uppercase is suitable for Java or Python but very counter-productive for C++; and the code is syntactically invalid. — Cheers and hth. - Alf, Jul 17 '14 at 06:10
**-1**: invalid code, e.g. `tempalte`, `Public`, two missing semicolons. — Cheers and hth. - Alf, Jul 17 '14 at 06:10
There is nothing in the `enum` that is specific to the template parameter. You can put it in `My` namespace. — R Sahu, Jul 17 '14 at 06:17
@RSahu yes you are rite, but its not my code its a standard library code (json-spirit) that I'm using. :) — balaji, Jul 17 '14 at 06:20
Still trying to figure this out? http://stackoverflow.com/questions/21992445/obj-type-was-not-declared-in-this-scope-note-suggested-alternative-enum-val/21992862#comment38486656_21992862 — , Jul 27 '14 at 08:41

score 3 · Accepted Answer · answered Jul 17 '14 at 06:09

3

Something like

My::BasicValue<int>::Type t;           // get an instance of the type
....
t = My::BasicValue<int>::STRING_TYPE;  // get a value

but this assumes you fix all the syntax errors in the code, as in this example..

answered Jul 17 '14 at 06:09

juanchopanza

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How to access enum present as a template class member in another namespace?

1 Answers1