Clang (OS X) requires “template” keyword in a particular nested declaration, while VS forbids it

Question

I am writing a cross-platform application in two compilers (Clang on Xcode v5.0.2, and Visual Studio 2012 Update 4) and I have run into a scenario in which the two compilers

Answer 1

Clang is correct, Base is dependent on a template parameter. This is yet another symptom of Visual C++ not implementing two-phase name lookup for templates.