On Wednesday, 13 July 2016 at 12:05:18 UTC, Lodovico Giaretta
wrote:
On Wednesday, 13 July 2016 at 11:59:18 UTC, Miguel L wrote:
I am using a temporary dynamic array inside a loop this way:
A[] a;
for(....)
{
a=[]; //discard array contents
... appends thousand of elements to a
... use a for some calculations
}
I would like to know which would be the best way to clear a
contents avoiding reallocations, as there seems to be lots of
garbage collection cycles taking place.
The options would be:
a=[];
a.length=0;
a=null;
...
any other?
Can you help me please?
Use std.array.Appender. It allows faster appends, and has a
handy .clear method that zeroes the length of the managed
array, without de-allocating it, so the same buffer is reused.
I tried Appender, but for some reason garbage collector still
seems to be running every few iterations.
I will try to expand a little on my code because maybe there is
something i am missing:
Appender!(A[]) a;
void foo( out Appender!(A[]) bar)
{
...
bar~= lot of elements
}
for(....)
{
//a=[]; //discard array contents
a.clear();
foo(a) appends thousand of elements to a
... use a for some calculations
}
