dynamic array capacity

Steven Schveighoffer schveiguy at yahoo.com
Wed Dec 29 08:24:01 PST 2010


On Wed, 29 Dec 2010 07:29:29 -0500, spir <denis.spir at gmail.com> wrote:

> Hello,
>
> Is there a common idiom to pre-allocate a dynamic array. I mean  
> allocating to avoid numerous re-allocations in loop, not setting length  
> & filling content.

int[] x;
x.reserve(10000); // pre-allocate at least 10000 elements for appending

Another way to do it:

Appender!(int[]) app;
app.reserve(10000);

this will perform much better than builtin array appending.

-Steve


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