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    <p>If you care a lot about executable size, then you might want to avoid using STL in your program.</p> <p>For example, <a href="http://www.utorrent.com/" rel="nofollow">uTorrent</a> doesn't use STL and that is one reason why it's so small.</p> <p>Since STL does rely on templates a lot (it is Standard TEMPLATE Library, after all), many times you use templates, the compiler has to generate extra code for every type you use when dealing with STL.</p> <p>This is compile time polymorphism and will increase your executable size the more you use it.</p> <p>If you exclude STL from your project (and use templates sparingly or not at all), your code size will get smaller. Note that it won't necessarily be faster.</p> <p>Also note that I'm not talking about a program's memory usage during execution, since that will depend on how many objects your allocating during your app's lifetime.</p> <p>I'm talking about your binary's executable. </p> <p>If you want an example, note that a simple Hello world program, when compiled, might be bigger than a cleverly code <a href="http://en.wikipedia.org/wiki/Demo_%28computer_programming%29" rel="nofollow">demo</a> which can include an entire 3D engine (run time generated) in a very small executable.</p> <hr> <p>Some info regarding uTorrent's size:</p> <p><a href="http://web.archive.org/web/20080619055556/http://www.utorrent.com/faq.php#How_can_.C2.B5Torrent_be_so_small_and_so_fast.3F" rel="nofollow">Official FAQ (from 2008), this question doesn't appear in recent FAQ.</a></p> <p><a href="http://forum.utorrent.com/viewtopic.php?id=55611" rel="nofollow">How was uTorrent programmed to be so efficient?</a></p> <p><a href="http://forum.staging.utorrent.com/viewtopic.php?id=1632" rel="nofollow">Second post regarding this.</a></p> <p><a href="https://forum.utorrent.com/viewtopic.php?id=22219" rel="nofollow">Third post regarding this.</a></p> <p>Note that, even though uTorrent is >300kb and is compressed with <a href="http://upx.sourceforge.net/" rel="nofollow">UPX</a>, it is still really small when you take into account what it's capable of doing.</p>
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    1. POReason for not using the STL?
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    1. COInteresting, I didn't really expect this! Thanks for your answer
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    2. COuTorrent is >300KB. I don't think using the standard STL containers would make much of a difference. Especially if you consider that writing your own containers will need space too.
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    3. COI/O streams tend to be big. Containers are rather small, as they allocate data on heap anyway.
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