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  27 <a name="boost.algorithm.trim_left_if"></a><div class="titlepage"></div>
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  29 <h2><span class="refentrytitle">Function template trim_left_if</span></h2>
  30 <p>boost::algorithm::trim_left_if &#8212; Left trim. </p>
  31 </div>
  32 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  33 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../string_algo/reference.html#header.boost.algorithm.string.trim_hpp" title="Header &lt;boost/algorithm/string/trim.hpp&gt;">boost/algorithm/string/trim.hpp</a>&gt;
  34
  35 </span>
  36 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> SequenceT<span class="special">,</span> <span class="keyword">typename</span> PredicateT<span class="special">&gt;</span>
  37   <span class="keyword">void</span> <span class="identifier">trim_left_if</span><span class="special">(</span><span class="identifier">SequenceT</span> <span class="special">&amp;</span> Input<span class="special">,</span> <span class="identifier">PredicateT</span> IsSpace<span class="special">)</span><span class="special">;</span></pre></div>
  38 <div class="refsect1">
  39 <a name="idp133127648"></a><h2>Description</h2>
  40 <p>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.</p>
  41 <p>
  42 </p>
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  49 <td><p><span class="term">Parameters:</span></p></td>
  50 <td><div class="variablelist"><table border="0" class="variablelist compact">
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  53 <col>
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  56 <tr>
  57 <td><p><span class="term"><code class="computeroutput">Input</code></span></p></td>
  58 <td><p>An input sequence </p></td>
  59 </tr>
  60 <tr>
  61 <td><p><span class="term"><code class="computeroutput">IsSpace</code></span></p></td>
  62 <td><p>A unary predicate identifying spaces </p></td>
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