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  31           Default constructors don't allocate memory which improves performance and
  32           usually implies a no-throw guarantee (if predicate's or allocator's default
  33           constructor doesn't throw).
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  36           Small string optimization for <code class="computeroutput"><a class="link" href="../boost/container/basic_string.html" title="Class template basic_string">basic_string</a></code>,
  37           with an internal buffer of 11/23 bytes (32/64 bit systems) <span class="bold"><strong>without</strong></span>
  38           increasing the usual <code class="computeroutput"><span class="keyword">sizeof</span></code>
  39           of the string (3 words).
  40         </li>
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  42           <code class="computeroutput"><span class="special">[</span><span class="identifier">multi</span><span class="special">]</span><span class="identifier">set</span><span class="special">/</span><span class="identifier">map</span></code>
  43           containers are size optimized embedding the color bit of the red-black
  44           tree nodes in the parent pointer.
  45         </li>
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  47           <code class="computeroutput"><span class="special">[</span><span class="identifier">multi</span><span class="special">]</span><span class="identifier">set</span><span class="special">/</span><span class="identifier">map</span></code>
  48           containers use no recursive functions so stack problems are avoided.
  49         </li>
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