On 3/15/12 5:14 AM, Iain Buclaw wrote:
On 15 March 2012 09:52, Derek<ddparn...@bigpond.com> wrote:
Are you saying that the generated code is something like ...
struct __tmpS { int Fa, int Fb };
__tempS __tmp;
__tmp.Fa = a;
__tmp.Fb = b;
a = __tmp.Fb;
b = __tmp.Fa;
In effect, yes. Given that the call to from() is inlined. :-)
In GDC, you have a -fdump-tree-original switch that dumps a debug
representation (that just so happens to look C-like) of the AST of the
code to a file. You could use this to unravel some of the magic going
on under the covers. ;-)
One note - the code is really ingenious, but I still prefer swap() in
this case. It's more concise and does less work in the general case.
swap(a[i + k], a[j + j]);
only computes the indexing once (in source, too).
Andrei
