how to know a class wheather it inherit from another class.

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3.00/5 (1 vote)

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i want do like this

C++

class A: public ...
{
 public:
    //strObj: a class's name
    bool isInherit(string strObj)
    {
        //A inherit from strObj? 
    }
}

thanks

Posted 20-Nov-12 3:11am

KID_coder

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joshrduncan2012 20-Nov-12 9:21am

What is your question?

Albert Holguin 20-Nov-12 14:19pm

Curious as to why you would want to do something like this?

Sergey Alexandrovich Kryukov 20-Nov-12 19:31pm

Right question. Why? I mean, it maybe somewhat interesting question, but answering a question without known motivation by OP is not interesting -- it may turn out to be a waste of time...
--SA

Albert Holguin 20-Nov-12 21:59pm

Exactly... plus if you know the motivation, there may also be a better solution to meet the end goal.

Sergey Alexandrovich Kryukov 20-Nov-12 22:03pm

That is the main reason to tell about the goals.
--SA

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Pablo Aliskevicius · Accepted Answer · 2012-11-20T03:22:00

If you really need to receive a string at run time (e.g., something entered by a user), you need reflection; but C++ does not have reflection. The closest thing is RTTI (run time type information); personally, I try not to use it (never found myself in a situation where the overhead is justified).

If you can know which two classes you're checking for inheritance at compile time, google static_cast.
Also, you may be interested in the LOKI code library, or BOOST; they have templates that show whether A inherits B. But those are advanced libraries. All of them are resolved at compile time, which is a good thing (zero runtime overhead).

Hope this helps,

Pablo.