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## Function template trim_left_if

boost::algorithm::trim_left_if — Left trim.

## Synopsis

    template<typename SequenceT, typename PredicateT>
      void trim_left_if(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 input sequence is modified in-place.

Parameters:

`Input` | An input sequence
`IsSpace` | An unary predicate identifying spaces

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