Re: Standard Template Library or C?

From:
"Bo Persson" <bop@gmb.dk>
Newsgroups:
comp.lang.c++
Date:
Thu, 22 Oct 2009 18:29:21 +0200
Message-ID:
<7kbfisF38feitU1@mid.individual.net>
Johnson wrote:

Michael Oswald wrote:

Johnson wrote:

Great. Thank you for your advice.


In addition to Victors comments, there was a thread longer ago
(about half a year?) where somebody implemented a queue in C,
optimised it as much as possible and then compared it to an STL
implementation (I think from g++). It turned out that the STL
implementation was faster no matter how much he optimized the C
queue. I don't remember the outcome of the thread (and I don't
have a msg ID at hand now), but I think it was about that the C++
compiler could perform a better inlining of the templated queue.

Anyway, this was a special case. For general, I second Victors
solution, first get it right and then if you need more
performance, measure first. If it's large data to process the IO
could be more of a bottleneck than the difference between a C and
a C++ container. lg,
Michael


Thank you, Michael. Now I believe the STL might be even faster than
the ANSI C solution. However, I don't understand why the C++
compiler could perform a better inlining of the queue than the C
compiler. Can I inlining the queue in C if I want to?


Yes, you can do the inlining in C, if you want to, but you have to do
it separately for each type queued.

With a C++ template, the compiler does it for you, from a single set
of source code.

Bo Persson

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