[gameprogrammer] Re: detecting class type at runtime

  • From: Brian Barrett <brian.ripoff@xxxxxxxxx>
  • To: gameprogrammer@xxxxxxxxxxxxx
  • Date: Wed, 18 Apr 2012 16:01:58 +0100

It really depends on what you are doing. For some cases, double
dispatch might be reasonable. For others, moving the special logic
into the class as a virtual function might be appropriate. In limited
cases, using dynamic_cast<> might be the simplest solution.

Checking for specific subtypes indicates that your design is flawed or
brittle. It can be a symptom of artificial inheritance hierarchies -
if data is different enough to need special treatment, segregate it
entirely. You can still use composition and templates to save yourself
from duplicating logic.

-- Brian

On 18 April 2012 14:09,  <luo_hei@xxxxxxxx> wrote:
> I need to know if variable is of type B or C at runtime, is there some 
> portable way to do this?

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