Re: Reserve_Capacity for Unbounded_String?

[Pascal Obry <pascal@obry.net>]

Randy Brukardt a �crit :
> In any case, implementing Reserve_Capacity to do anything (as opposed to
> being a no-op) in Janus/Ada would require junking the entire existing
> implementation and starting over. It surely would add overhead (because
> you'd continually need to check the allocated length against the "nominal"
> length). As such, this is something I would fight strongly.

Well this is already done in GNAT for speed performances. If you are
adding lot of chunk of string into an Unbounded_String it is far too
costly to reallocate the Unbounded_String buffer each time. This was a
huge speed penalty for the templates_parser for example. The current
GNAT implementation is just what users would expect it to be.

Pascal.

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