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Id
4530644
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0
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0
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0
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2010-12-25T15:30:17.057
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0
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2010-12-25T15:30:17.057
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0
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399317
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4530543
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2
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text
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Assuming a constant value as a word length looks like asking for trouble to me. I recommend against this solution. Look: The <code>strcmp</code> solution doesn't work for you because it treats the <code>const char*</code> arguments as nul-terminated strings. You want a function which does exactly the same, but treats the arguments as words - which translates to "anything-not-a-letter"-terminated string. One could define <code>strcmp</code> in a generic way as: <pre><code>template<typename EndPredicate> int generic_strcmp(const char* s1, const char* s2) { char c1; char c2; do { c1 = *s1++; c2 = *s2++; if (EndPredicate(c1)) { return c1 - c2; } } while (c1 == c2); return c1 - c2; } </code></pre> If EndPredicate is a function which returns true iff its argument is equal to <code>\0</code>, then we obtain a regular <code>strcmp</code> which compares 0-terminated strings. But in order to have a function which compares words, the only required change is the predicate. It's sufficient to use the inverted <code>isalpha</code> function from <code><cctype></code> header file to indicate that the string ends when a non-alphabetic character is encountered. So in your case, your comparator for the set would look like this: <pre><code>#include <cctype> int wordcmp(const char* s1, const char* s2) { char c1; char c2; do { c1 = *s1++; c2 = *s2++; if (!isalpha(c1)) { return c1 - c2; } } while (c1 == c2); return c1 - c2; } </code></pre>
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1. POC++: set of C-strings
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