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| 4 Algorithms | |
| 5 | |
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| 7 The neatest accomplishment of the algorithms chapter is that all the | |
| 8 work is done via iterators, not containers directly. This means two | |
| 9 important things: | |
| 10 </p><div class="orderedlist"><ol type="1"><li><p> | |
| 11 Anything that behaves like an iterator can be used in one of | |
| 12 these algorithms. Raw pointers make great candidates, thus | |
| 13 built-in arrays are fine containers, as well as your own iterators. | |
| 14 </p></li><li><p> | |
| 15 The algorithms do not (and cannot) affect the container as a | |
| 16 whole; only the things between the two iterator endpoints. If | |
| 17 you pass a range of iterators only enclosing the middle third of | |
| 18 a container, then anything outside that range is inviolate. | |
| 19 </p></li></ol></div><p> | |
| 20 Even strings can be fed through the algorithms here, although the | |
| 21 string class has specialized versions of many of these functions | |
| 22 (for example, <code class="code">string::find()</code>). Most of the examp
les | |
| 23 on this page will use simple arrays of integers as a playground | |
| 24 for algorithms, just to keep things simple. The use of | |
| 25 <span class="emphasis"><em>N</em></span> as a size in the examples is to ke
ep | |
| 26 things easy to read but probably won't be valid code. You can | |
| 27 use wrappers such as those described in the <a class="ulink" href="../23_co
ntainers/howto.html" target="_top">containers chapter</a> to | |
| 28 keep real code readable. | |
| 29 </p><p> | |
| 30 The single thing that trips people up the most is the definition | |
| 31 of <span class="emphasis"><em>range</em></span> used with iterators; the fa
mous | |
| 32 "past-the-end" rule that everybody loves to hate. The | |
| 33 <a class="ulink" href="../24_iterators/howto.html#2" target="_top">iterator
s | |
| 34 chapter</a> of this document has a complete explanation of | |
| 35 this simple rule that seems to cause so much confusion. Once you | |
| 36 get <span class="emphasis"><em>range</em></span> into your head (it's not t
hat | |
| 37 hard, honest!), then the algorithms are a cakewalk. | |
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| 39 Algorithms | |
| 40 | |
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