mingw/info/gdb/Debugging-C.html

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  19 <h5 class="subsubsection">GDB and C</h5>
  20
  21    <p>The <code>set print union</code> and <code>show print union</code> commands apply to
  22 the <code>union</code> type.  When set to <code>on</code>, any <code>union</code> that is
  23 inside a <code>struct</code> or <code>class</code> is also printed.  Otherwise, it
  24 appears as <code>{...}</code>.
  25
  26    <p>The <code>@</code> operator aids in the debugging of dynamic arrays, formed
  27 with pointers and a memory allocation function.  See <a href="Expressions.html#Expressions">Expressions</a>.
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