Function trim_left_copy

Function trim_left_copy_if

boost::algorithm::trim_left_copy_if — Left trim - parametric.

Synopsis

template<typename OutputIteratorT, typename RangeT, typename PredicateT> 
  OutputIteratorT 
  trim_left_copy_if(OutputIteratorT Output, const RangeT & Input, 
                    PredicateT IsSpace);
template<typename SequenceT, typename PredicateT> 
  SequenceT trim_left_copy_if(const SequenceT & Input, PredicateT IsSpace);

Description

Remove all leading spaces from the input. The supplied predicate is used to determine which characters are considered spaces. The result is a trimmed copy of the input. It is returned as a sequence or copied to the output iterator

Parameters

Input: An input range
IsSpace: An unary predicate identifying spaces
Output: An output iterator to which the result will be copied

Returns: An output iterator pointing just after the last inserted character or a copy of the input
Notes: The second variant of this function provides the strong exception-safety guarantee