Function erase_head

Function erase_head_copy

boost::algorithm::erase_head_copy — Erase head algorithm.

Synopsis

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


template<typename OutputIteratorT, typename RangeT> 
  OutputIteratorT 
  erase_head_copy(OutputIteratorT Output, const RangeT & Input, int N);
template<typename SequenceT> 
  SequenceT erase_head_copy(const SequenceT & Input, int N);

Description

Remove the head from the input. The head is a prefix of a sequence of given size. If the sequence is shorter then required, the whole string is considered to be the head. The result is a modified copy of the input. It is returned as a sequence or copied to the output iterator.

	Note
	The second variant of 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.
`Output`	An output iterator to which the result will be copied

Returns:

An output iterator pointing just after the last inserted character or a modified copy of the input