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Function template find_head

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

Synopsis

template<typename RangeT> 
  iterator_range< typename range_result_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.

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.
Notes:

This function provides the strong exception-safety guarantee

Copyright © 2002-2004 Pavol Droba
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