[gameprogrammer] Re: detecting class type at runtime
- From: Jonathan Dearborn <grimfang4@xxxxxxxxx>
- To: gameprogrammer@xxxxxxxxxxxxx
- Date: Wed, 18 Apr 2012 09:36:34 -0400
C++ does not have true reflection capabilities. However, you can use RTTI
in the form of dynamic_cast:
B* b = dynamic_cast<B*>(variable);
if(b)
{
// Use b
return; // return here or otherwise skip the C part below
}
C* c = dynamic_cast<C*>(variable);
if(c)
{
// Use c
}
Otherwise, you can include the type info yourself:
class A
{
enum TypeEnum {CLASS_B, CLASS_C};
TypeEnum type;
};
void dosomething(A* variable)
{
switch(variable->type)
{
case A::CLASS_B:
{
B* b = static_cast<B*>(variable);
}
break;
case A::CLASS_C:
{
C* c = static_cast<C*>(variable);
}
break;
}
}
Both of these methods are less than ideal... You could use templates (and
specialize the functions you need to differentiate) to avoid breaking the
type system in this way.
Jonny D
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