How to get an object of an unknown class with the given name

Question

I am looking for a way to determine at runtime which type of object should be allocated (based on the given name of the class having the type const char*).

Well, the easiest way is to use if/ else ifs loads , but that doesn't seem to be applicable, because I have> 100 different classes (well, at least they all come from the same base class) and I should also add new classes pretty regularly .

I already came up with the first draft, but unfortunately it is not compiling yet (mingw and g ++ 4.4)

template<typename TBase, typename TDerived, typename... TArgs>
Base* get_classobject(const char* classname)
{
    if(strcmp(classname,typeid(TDerived).name())==0)
        return new TDerived; //
    else if(sizeof...(TArgs)>0)
        return get_classobject<TBase,TArgs...>(classname);
    else
        return 0;
}


int main()
{
    Base* obj = get_classobject<Base,A,Foo,B,C>("Foo");
    // ^- Types A B C and Foo are all derived from Base
    delete obj; //of course we got an virtual dtor ;)
    return 0;
}

but sizeof...(TArgs)>0does not stop gcc from trying to generate code for get_classobject<TBase,const char*>(const char*)that that fails

Do you have any idea how to fix this or any other idea? Thank.

EDIT: I decided:

template<typename TBase, typename TDerived>
Base* get_classobject(const char* classname)
{
    if(strcmp(classname,typeid(TDerived).name())==0)
        return new TDerived;
    return 0;
}

template<typename TBase, typename TDerived, typename TArg, typename... TArgs>
Base* get_classobject(const char* classname)
{
    if(strcmp(classname,typeid(TDerived).name())==0)
        return new TDerived;
    return get_classobject<TBase,TArg,TArgs...>(classname);
}

EDIT :
, . typeif(sometype).name() /. static const char* name Derived, , (, , , factory)

Answer 1

template<typename TBase, typename TDerived, typename TArg, typename... TArgs>

?

typename TBase, typename TDerived, typename TArg

Answer 2

here, , factory.

Answer 3

get_classobject() temlates? .

, - template<typename TBase, typename TDerived>. - , const char *, 0.

Answer 4

, factory. . method