Cpp Coding Standards/STL/PurePred

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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.

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