boost::algorithm::trim_copy_if — 修剪 - 参数化。
// In header: <boost/algorithm/string/trim.hpp> template<typename OutputIteratorT, typename RangeT, typename PredicateT> OutputIteratorT trim_copy_if(OutputIteratorT Output, const RangeT & Input, PredicateT IsSpace); template<typename SequenceT, typename PredicateT> SequenceT trim_copy_if(const SequenceT & Input, PredicateT IsSpace);