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  18. <title>M2 Scope (Debugging with GDB)</title>

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  68. <hr>

  69. <a name="The-Scope-Operators-_003a_003a-and-_002e"></a>

  70. <h4 class="subsubsection">15.4.9.8 The Scope Operators <code>::</code> and <code>.</code></h4>

  71. <a name="index-scope"></a>

  72. <a name="index-_002e_002c-Modula_002d2-scope-operator"></a>

  73. <a name="index-colon_002c-doubled-as-scope-operator"></a>

  74. <a name="index-_003a_003a_002c-in-Modula_002d2"></a>

  75. 

  76. <p>There are a few subtle differences between the Modula-2 scope operator

  77. (<code>.</code>) and the <small>GDB</small> scope operator (<code>::</code>).  The two have

  78. similar syntax:

  79. </p>

  80. <div class="smallexample">

  81. <pre class="smallexample">

  82. 

  83. <var>module</var> . <var>id</var>

  84. <var>scope</var> :: <var>id</var>

  85. </pre></div>

  86. 

  87. <p>where <var>scope</var> is the name of a module or a procedure,

  88. <var>module</var> the name of a module, and <var>id</var> is any declared

  89. identifier within your program, except another module.

  90. </p>

  91. <p>Using the <code>::</code> operator makes <small>GDB</small> search the scope

  92. specified by <var>scope</var> for the identifier <var>id</var>.  If it is not

  93. found in the specified scope, then <small>GDB</small> searches all scopes

  94. enclosing the one specified by <var>scope</var>.

  95. </p>

  96. <p>Using the <code>.</code> operator makes <small>GDB</small> search the current scope for

  97. the identifier specified by <var>id</var> that was imported from the

  98. definition module specified by <var>module</var>.  With this operator, it is

  99. an error if the identifier <var>id</var> was not imported from definition

  100. module <var>module</var>, or if <var>id</var> is not an identifier in

  101. <var>module</var>.

  102. </p>

  103. 

  104. 

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  106. </body>

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