...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::algorithm::partition_copy
// In header: <boost/algorithm/cxx11/partition_copy.hpp> template<typename Range, typename OutputIterator1, typename OutputIterator2, typename UnaryPredicate> BOOST_CXX14_CONSTEXPR std::pair< OutputIterator1, OutputIterator2 > partition_copy(const Range & r, OutputIterator1 out_true, OutputIterator2 out_false, UnaryPredicate p);