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boost::algorithm::join_if — Conditional join algorithm.
// In header: <boost/algorithm/string/join.hpp> template<typename SequenceSequenceT, typename Range1T, typename PredicateT> range_value< SequenceSequenceT >::type join_if(const SequenceSequenceT & Input, const Range1T & Separator, PredicateT Pred);
This algorithm joins all strings in a 'list' into one long string. Segments are concatenated by given separator. Only segments that satisfy the predicate will be added to the result.
| ![[Note]](../../../../doc/src/images/note.png) | Note | 
|---|---|
| This function provides the strong exception-safety guarantee | 
| Parameters: | 
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| Returns: | Concatenated string. |