More on C++ stack arrays

Andrei Alexandrescu SeeWebsiteForEmail at erdani.org
Sun Oct 20 09:57:03 PDT 2013


On 10/20/13 9:33 AM, Walter Bright wrote:
> Stack allocated arrays are far more trouble than they're worth. But what
> about efficiency? Here's what I often do something along the lines of:
>
>      T[10] tmp;
>      T[] a;
>      if (n <= 10)
>      a = tmp[0..n];
>      else
>      a = new T[n];
>      scope (exit) if (a != tmp) delete a;
>
> The size of the static array is selected so the dynamic allocation is
> almost never necessary.

Fallback allocators will make it easy to define an allocator on top of a 
fixed array, backed by another allocator when capacity is exceeded. BTW 
I'm scrambling to make std.allocator available for people to look at and 
experiment with.


Andrei



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