On Friday, 28 August 2015 at 06:19:55 UTC, Jacob Carlborg wrote:
On 2015-08-26 20:59, Adam D. Ruppe wrote:
Yes, exactly. COM and C++ things won't necessarily have a D
TypeInfo
available and since interfaces can be them, it can't be sure.
What I do there is to just cast the interface to Object. Then
you should
check for null to cover those cases, then you can typeid or
classinfo it.
Is it possible to detect at compile time if an interface is not
a native D interface?
Now when I think about it, we actually have four (!) different
kinds of interfaces. Native D, C++, Objective-C and COM.
I don't know about Objective-C, but:
- for native D interfaces __traits(getVirtualIndex,
NativeInterface.firstFunction) == 1 since the first entry in vtbl
is the contained object
- for C++ interfaces __traits(getVirtualIndex,
CPPInterface.firstFunction) == 0
- COM interfaces: __traits(getVirtualIndex,
CPPInterface.firstFunction) == 0 and inherit IUnknown
At runtime, it's simple, you have the m_flags member of
TypeInfo_Class (isCPPclass, isCOMclass)
