On 2010-08-26 18:06:24 -0400, "Mathias Laurenz Baumann"
<[email protected]> said:
http://www.digitalmars.com/d/2.0/interfaceToC.html still says there is
no const/immutable in D:
There are no const or volatile type modifiers in D. To declare a C
function that uses those type modifiers, just drop those keywords from
the declaration.
but that is obviously out-dated. What should I use now, when
interfacing with C?
Most of the time, you'll want to use const when C does. But take note
that const in D is transitive, so if you have a const pointer to
mutable data in C you can't express that in D. I'd say just drop const
for those cases.
As for immutable, there's no such thing in C. If a function is
documented as requiring a pointer to data that will never change, then
it might make some sense to make the argument immutable instead of
const. Also, if a C function returns a pointer to data that you
positively know will never change, you could make it immutable too. But
be careful with immutable: using it carelessly might cause the compiler
to make the wrong assumptions and cause bugs. When in doubt, use const.
--
Michel Fortin
[email protected]
http://michelf.com/
