Function template find

Function template find_head

boost::algorithm::find_head — Find head algorithm.

Synopsis

// In header: <boost/algorithm/string/find.hpp>


template<typename RangeT> 
  iterator_range< typename range_iterator< RangeT >::type > 
  find_head(RangeT & Input, int N);

Description

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 if considered to be the head.

	Note
	This function provides the strong exception-safety guarantee

Parameters:

`Input`	An input string
`N`	Length of the head For N>=0, at most N characters are extracted. For N<0, size(Input)-\|N\| characters are extracted.

Returns:

An iterator_range delimiting the match. Returned iterator is either Range1T::iterator or Range1T::const_iterator, depending on the constness of the input parameter.