C++ macro “if class is defined”

Question

Is there such macro in C++ (cross-compiler or compiler-specific):

#if isclass(NameSpace::MyClass)

Would be useful.

Answer 1

There is no such thing at the preprocessing stage, so no macro.

However you can have a look at the is_class type traits available in Boost or in C++0x that enable you to take decisions at compile time.