Question

I am not sure about other versions, but, in VS 2008 even with RTTI disabled I can query the information by calling typeid(T).name() on the type. It works with all types, internal and user created.

Our project has RTTI disabled but I was surprised to find that this still worked. Is this a Visual Studio bug or is the /GR- flag not enough to disable it? Does this fall into the realm of undefined behavior? If it is not a bug, how do I really turn it off?

Answer 1

Is it possible that you used typeid on an expression whose type is known at compile time? If so you would bypass the “run-time” aspect of RTTI altogether. From the Microsoft documentation on typeid:

If the expression is neither a pointer nor a reference to a base class
of the object, the result is a type_info reference representing the
static type of the expression. The static type of an expression refers
to the type of an expression as it is known at compile time. Execution
semantics are ignored when evaluating the static type of an
expression.