On Sun, 05 Sep 2010 22:41:50 -0400, bearophile <bearophileh...@lycos.com>
wrote:
Tom Kazimiers:
How can I have a (temporary) dynamic array on stack and make references
to it (no copying)? I successively put integers in an array (but don't
know how much there will be in advance) with an appender!(int[]) and get
the date out with appender.data(). Later on I pass the result to a
method as an "in int[]" parameter. Is that already a reference or will
it be copied? Are there better methods to accomplish this? The method
receiving such an array will not modifiy contents of the array, but only
read from it.
The appender.data() doesn't currently copy data.
There is no standard way to put a growable array on the stack. Maybe you
can hack it with several successive calls to alloca(), but I have never
tried it.
Hm... you can do something like this (after upcoming release, appender has
changed):
void foo()
{
int[1024] buf;
auto app = appender(buf[]);
app.clear();
...
}
After app.clear, appender will fill up the static buffer until full, and
then reallocate on the heap.
Note that the new appender uses heap data to store its implementation, so
it's not as quick as it could be. This is per Andrei's requirement that
it be a reference type.
-Steve
