On Wed, 18 Aug 2010 13:13:25 +0300, Andrei Alexandrescu
<[email protected]> wrote:
http://www.informit.com/articles/article.aspx?p=1622265
Thanks, that was an interesting read.
It's possible that I'm missing something, but I think that C++'s default
constructors + reference-type structs/classes allow a pattern which isn't
easily translatable to D. For example, in C++...
class A { /* a class with a default constructor */ };
struct B { A a; /* ... */ };
struct C { B b; /* ... */ };
Now, instantiating C will invoke A's constructors. In order for this to
work, the compiler automatically generates hidden constructors for B and
C. However, D doesn't have default constructors for structs (and,
according to TDPL, never will)? D does seem to generate hidden postblit
constructors and destructors, though.
If I had to port a C++ project to D which made heavy use of this pattern,
what would be the best way to do it? The only ways I see is either
rewriting the code to use classes (which means writing constructors with
explicit instantiation, more dereferences and heap usage leading to worse
performance...), or implementing and calling pseudo-constructors in both B
and C, and (most importantly) all places which "instantiate" C. Did I miss
anything?
--
Best regards,
Vladimir mailto:[email protected]
