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boost::algorithm::copy_if — Copies all the elements from the input range that satisfy the predicate to the output range.
// In header: <boost/algorithm/cxx11/copy_if.hpp> template<typename InputIterator, typename OutputIterator, typename Predicate> OutputIterator copy_if(InputIterator first, InputIterator last, OutputIterator result, Predicate p);
| ![[Note]](../../../../../../doc/src/images/note.png) | Note | 
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| This function is part of the C++2011 standard library. | 
| Parameters: | 
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| Returns: | The updated output iterator |