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    <p>Yes, you used it, since <code>std::string</code> alone is "part of the STL", but, more importantly, you are using the iterators, which are a distinctive trait of the STL.</p> <p>Now, for the mandatory purists part: the STL was a library published by SGI and developed mainly by Alexander Stepanov. What I think you are referring to is "the part of the SGI STL which was later included into the standard with some minor modifications", i.e. all the generic containers/algorithms/iterators stuff.</p> <p>The usage of the term "STL" for this stuff is tolerated, what is plain wrong, instead, is calling "STL" the whole C++ standard library (which includes a lot of other stuff, e.g. iostreams, locale, the library inherited from C, ...).</p> <blockquote> <p>If I have used STL, how can I modify them to do what they do without STL?</p> </blockquote> <p>Why would you want to do that? Anyhow, you have several options, that span from rewriting such classes and algorithms from scratch to using simpler data structures (e.g. C strings) reimplementing only the algorithms you need. Anyway, they both imply reinventing the wheel (and probably reinventing a square wheel), so I'd advise you against doing this unless you have a compelling reason.</p> <hr /> <blockquote> <p>EDIT: I guess this is OUR definition of STL: <a href="http://www.sgi.com/tech/stl/stl_index_cat.html" rel="nofollow">http://www.sgi.com/tech/stl/stl_index_cat.html</a></p> </blockquote> <p>Are you sure? Almost no one today uses the SGI STL, generally you use the (more or less) equivalent portion of your C++ standard library (that, by the way, is what you are doing in your code, since you are getting everything from the <code>std</code> namespace).</p> <blockquote> <p>I don't see const_iterator...</p> </blockquote> <p><code>const_iterator</code> is a <code>typedef</code> member of <code>basic_string&lt;char&gt;</code>, you find it in <a href="http://www.sgi.com/tech/stl/basic_string.html" rel="nofollow">its page</a>.</p> <blockquote> <p>but I do see max. But is that the max I used?</p> </blockquote> <p>No, it's not it, your <code>max</code> is not a global function, but a member of the <code>std::numeric_limits</code> template class. Such class do not come from the STL.</p>
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    1. POHave I used STL? Or not?
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    1. CO+1 for finally addressing the confusion here between STL and std. Its either C++'s string and STL, or char*s and counters. You could even `#include` a string header from your C implementation.
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      1. USNiall Cairns
    2. COAWESOME! Then based on HIS definition of STL, I am safe. My max is not part of STL on that SGI page. AND he said we could use string!
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