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boost::algorithm::find_head — Find head algorithm.
// In header: <boost/algorithm/string/find.hpp> template<typename RangeT> iterator_range< typename range_iterator< RangeT >::type > find_head(RangeT & Input, int N);
Get the head of the input. Head is a prefix of the string of the given size. If the input is shorter then required, whole input is considered to be the head.
| ![[Note]](../../../../doc/src/images/note.png) | Note | 
|---|---|
| This function provides the strong exception-safety guarantee | 
| Parameters: | 
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| Returns: | An  |