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List:       kde-devel
Subject:    Re: QPtrList documentation
From:       Jeroen Wijnhout <Jeroen.Wijnhout () kdemail ! net>
Date:       2003-07-15 13:29:56
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On Tuesday 15 July 2003 12:33, Adriaan de Groot wrote:
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>
> [This applies to the docs of Qt 3.x; I haven't got a copy of Qt 2.x to
> check the history. And it's pretty darn trivial.] In qptrlist.html, the
> example code in the "Detailed Description" section contains this:
>
>     // very inefficient for big lists
>     for ( uint i = 0; i < list.count(); ++i )
>         if ( list.at(i) )
>             cout << list.at( i )->surname().latin1() << endl;
>
> while the documentation for QPtrList::at() states
>
> This function is very efficient. It starts scanning from the first item,

Just my two cents:

Isn't the cout causing the inefficiency? Printing a large number of lines to 
stdout this way is very inefficient. Try redirecting stdout on the 
command-line to a file and measure the time difference.

best,
Jeroen
 
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