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* Add copyright header to those files missing oneMatthew Wild2009-07-101-0/+8
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* util.set: Add set.xor() to get a set consisting of items not in both setsMatthew Wild2009-04-221-0/+4
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* util.set: Add set:empty() to discover if the set is the empty setMatthew Wild2009-04-221-0/+4
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* util.set: Add metatable to sets to allow +, -, /, ==, tostring and to double ↵Matthew Wild2009-04-221-4/+54
| | | | as iterators
* util.set: Rename private items container, optimise set.difference() and add ↵Matthew Wild2009-03-231-9/+18
| | | | set.intersection()
* util.set: Fix to make constructor work, and functions defined correctlyMatthew Wild2009-03-221-8/+14
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* util.set: New util libraryMatthew Wild2009-03-221-0/+75