Re: Ada & MacOS

["Hyman Rosen" <hyman.rosen@gmail.com>]

Jeffrey R. Carter wrote:
> Using which compilers and what language features? Very few "C++" compilers
> implement the language defined by the ISO standard. Can you use all the features
> of the standard language and count on it compiling with all "C++" compilers?

Much more so now than in the past. The biggest missing feature is
implementation of the "export" keyword, and that's more due to
deliberate foot-dragging than anything else, by vendors who loathe
the feature. There are also legacy features that remain in some
implementations that would not be there in a completely conforming
compiler. But you now have to be quite expert in C++ to find the
missing features in modern compilers.

> Ada compilers can implement compiler-dependent pragmas and attributes, and can
> supply compiler-dependent packages. Many also supply platform-dependent
> packages. If you use those, you're not writing portable code. If you stick to
> the standard language, though, portability is pretty much guaranteed.

What about all the standard annexes which vendors may choose not to
implement? If I write a standard-conforming distributed program in Ada,
is portability pretty much guaranteed?