mingw/info/gdb/M2-Scope.html

   1 <html lang="en">
   2 <head>
   3 <title>Debugging with GDB</title>
   4 <meta http-equiv="Content-Type" content="text/html">
   5 <meta name="description" content="Debugging with GDB">
   6 <meta name="generator" content="makeinfo 4.3">
   7 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home">
   8 </head>
   9 <body>
  10 <div class="node">
  11 <p>
  12 Node:<a name="M2%20Scope">M2 Scope</a>,
  13 Next:<a rel="next" accesskey="n" href="GDB-M2.html#GDB%2fM2">GDB/M2</a>,
  14 Previous:<a rel="previous" accesskey="p" href="M2-Checks.html#M2%20Checks">M2 Checks</a>,
  15 Up:<a rel="up" accesskey="u" href="Modula-2.html#Modula-2">Modula-2</a>
  16 <hr><br>
  17 </div>
  18
  19 <h5 class="subsubsection">The scope operators <code>::</code> and <code>.</code></h5>
  20
  21    <p>There are a few subtle differences between the Modula-2 scope operator
  22 (<code>.</code>) and the GDB scope operator (<code>::</code>).  The two have
  23 similar syntax:
  24
  25 <pre class="example">
  26      <var>module</var> . <var>id</var>
  27      <var>scope</var> :: <var>id</var>
  28      </pre>
  29
  30 <p>where <var>scope</var> is the name of a module or a procedure,
  31 <var>module</var> the name of a module, and <var>id</var> is any declared
  32 identifier within your program, except another module.
  33
  34    <p>Using the <code>::</code> operator makes GDB search the scope
  35 specified by <var>scope</var> for the identifier <var>id</var>.  If it is not
  36 found in the specified scope, then GDB searches all scopes
  37 enclosing the one specified by <var>scope</var>.
  38
  39    <p>Using the <code>.</code> operator makes GDB search the current scope for
  40 the identifier specified by <var>id</var> that was imported from the
  41 definition module specified by <var>module</var>.  With this operator, it is
  42 an error if the identifier <var>id</var> was not imported from definition
  43 module <var>module</var>, or if <var>id</var> is not an identifier in
  44 <var>module</var>.
  45
  46    </body></html>
  47