fix contains for empty containers
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@ -159,7 +159,7 @@ auto find_if(Container& container, T op) -> decltype(container.begin())
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template<typename Container, typename T>
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bool contains(const Container& container, const T& value)
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{
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return find(container, value) != container.end();
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return (not container.empty()) and find(container, value) != container.end();
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}
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// *** On scope end ***
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