[Lorenzo Caminiti]
I'm confused because the following code doesn't compile on MSVC but it _does_ compiles fine on GCC... typedef void (func_type)(double num = -1.23); // NO STANDARD?? 1) Is this a bug in GCC which should not accept `= -1.23` in `func_type`?
VC is correct to reject this code. (So does EDG.) C++03 8.3.6 "Default arguments" [dcl.fct.default]/3: "A default argument expression shall be specified only in the parameter-declaration-clause of a function declaration or in a template-parameter (14.1). If it is specified in a parameter-declaration-clause, it shall not occur within a declarator or abstract-declarator of a parameter-declaration.88)" Footnote 88: "This means that default arguments cannot appear, for example, in declarations of pointers to functions, references to functions, or typedef declarations."
2) Both, GCC and MSVC accept the parameter name `num` as part of the `func_type` type. Can parameter names be specified in function types?
Yes, that's totally fine, they're just ignored. C++03 8.3.5 "Functions" [dcl.fct]/8: "An identifier can optionally be provided as a parameter name", which applies to typedefs too. Stephan T. Lavavej Visual C++ Libraries Developer