Difference between revisions of "Cpp Coding Standards/STL/PurePred"
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Why should you keep predicates pure? Because STL assumes they are, and tend to make copies of your predicate. Violating this might work for your specific platform (compiler & STL), but will probably break mysteriously for others. | Why should you keep predicates pure? Because STL assumes they are, and tend to make copies of your predicate. Violating this might work for your specific platform (compiler & STL), but will probably break mysteriously for others. | ||
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Latest revision as of 17:14, 14 December 2009
A predicate should be a pure function (i.e. its result should depend only on its arguments). Prefer to make operator() const, to let any maintainer violating this trip over a compiler error.
Why should you keep predicates pure? Because STL assumes they are, and tend to make copies of your predicate. Violating this might work for your specific platform (compiler & STL), but will probably break mysteriously for others.
