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Subject: Re: [boost] Boost.Algorithm design question
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-10-06 12:31:45

Christian Holmquist wrote:
> On 5 October 2011 17:53, Stephan T. Lavavej
> <stl_at_[hidden]>wrote:
> > #1 is better. It follows the STL's conventions (e.g. look at
> > std::find()) and permits heterogeneous comparisons.
> >
> > Consider vector<string> and val being "meow". string is
> > directly comparable to const char *, without any conversions
> > or temporaries.
> The never ending reference to std::string vs const char*
> performance thing. I'm simply amazed about the simplicity of
> other developers performance issues, if this was the main
> bottleneck I would ever deal with I could have more time
> drinking coffee =)

Too much coffee is bad for you, so this is a good thing!

> -IF- such a case would show up in a profiler, I think it's
> only fair to let the developer optimize his scenario with
> some custom code, that to open up this can of worms for
> everyone else.

In the "meow" example above, forcing the construction of a std::string from the string literal implies a free store allocation which, in turn, generally implies a global lock. That means it can be a drag on MT performance. A library function shouldn't impose that if preventing or avoiding it is practicable.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer using std::disclaimer;
Dev Tools & Components
Susquehanna International Group, LLP


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