Is there a way to test whether a C++ class has a default constructor (other than compiler-provided type traits)?

Question

Traits classes can be defined to check if a C++ class has a member variable, function or a type (see here).

Curiously, the ConceptTraits do not include traits to che

Answer 1

MSDN says that the header defines has_default_constructor and such traits.

http://msdn.microsoft.com/en-us/library/bb982179.aspx