Struct inheritance

[ketmar via Digitalmars-d-learn]

On Tue, 24 Feb 2015 12:05:50 +0000, amber wrote:

> Hi,
> 
> Is it possible in D to have inheritance using value types, i.e. structs?
> 
> Also I don't quite understand how copy ctors work in D. Do I need to
> implement opAssign(S other) {}, or this(this) {} and what's the
> difference between these two?

there is no "copy constructor" in D. structs are copied by `memcpy()`, 
and then compiler calls "postblit" aka `this(this)`. it may seem like 
constructor, but it's not. it's a "fixup", that fixes inconsistencies 
that are left by `memcpy()`. i.e. when postblit is called, structure is 
already copied.

and `opAssign` is... well, overloading of "=" operator. it has to 
manually create a structure copy and manually copy everything you need. 
and it will never be called by compiler "behind the scenes", like 
postblit.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 181 bytes
Desc: not available
URL: <http://lists.puremagic.com/pipermail/digitalmars-d-learn/attachments/20150224/caf9871a/attachment.sig>