scilab/modules/core/help/en_US/control_flow/resume.xml

   1  <?xml version="1.0" encoding="UTF-8"?>
   2 <refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:lang="en" xml:id="resume">
   3     <refnamediv>
   4         <refname>resume</refname>
   5         <refpurpose>return or resume execution and copy some local variables</refpurpose>
   6     </refnamediv>
   7     <refsynopsisdiv>
   8         <title>Calling Sequence</title>
   9         <synopsis>resume
  10             [x1,..,xn]=resume(a1,..,an)
  11         </synopsis>
  12     </refsynopsisdiv>
  13     <refsection>
  14         <title>Arguments</title>
  15         <variablelist>
  16             <varlistentry>
  17                 <term>x1,..,xn</term>
  18                 <listitem>
  19                     <para>variables in calling environment</para>
  20                 </listitem>
  21             </varlistentry>
  22             <varlistentry>
  23                 <term>a1,..,an</term>
  24                 <listitem>
  25                     <para>local variables</para>
  26                 </listitem>
  27             </varlistentry>
  28         </variablelist>
  29     </refsection>
  30     <refsection>
  31         <title>Description</title>
  32         <para>
  33             In a function <literal>resume</literal> stops the execution of the function,
  34             <literal>[x1,..,xn]=resume(a1,..,an)</literal> stops the execution of the function and put the
  35             local variables <literal>ai</literal> in calling environment under names
  36             <literal>xi</literal>.
  37         </para>
  38         <para>
  39             In <literal>pause</literal> mode, it allows to return to lower level
  40             <literal>[x1,..,xn]=resume(a1,..,an)</literal> returns to lower level and put the local variables
  41             <literal>ai</literal> in calling environment under names <literal>xi</literal>.
  42         </para>
  43         <para>
  44             In an <literal>execstr</literal> called by a function <literal>[..]=resume(..)</literal> stops
  45             the execution of the function and put the local variables
  46             <literal>ai</literal> in calling environment under names <literal>xi</literal>.
  47         </para>
  48         <para>
  49             <literal>resume</literal> is equivalent to <literal>return</literal>.
  50         </para>
  51         <para>
  52             <note>
  53                 Note: the usage of this feature can complexify the code. Instead, the syntax <code>function b = foo()</code> is recommended.
  54             </note>
  55         </para>
  56     </refsection>
  57     <refsection>
  58         <title>Examples</title>
  59         <programlisting role="example"><![CDATA[
  60 function foo(a)
  61          a=a+1
  62          b=resume(a)
  63          c=52
  64 endfunction
  65
  66 foo(42);
  67 assert_checkequal(b,43);
  68 // c does not exist
  69
  70 ]]></programlisting>
  71         <programlisting role="example"><![CDATA[
  72
  73 // with several function calls
  74 function foo1()
  75   a=1;
  76   b=2;
  77   c=3;
  78   [x,y,z]=resume(a, b, c)
  79 endfunction
  80
  81 function foo2()
  82   foo1()
  83   x, y, z // Declared
  84 endfunction
  85
  86 foo2()
  87 // x y z does not exist here
  88 ]]></programlisting>
  89     </refsection>
  90     <refsection role="see also">
  91         <title>See Also</title>
  92         <simplelist type="inline">
  93             <member>
  94                 <link linkend="abort">abort</link>
  95             </member>
  96             <member>
  97                 <link linkend="break">break</link>
  98             </member>
  99             <member>
 100                 <link linkend="pause">pause</link>
 101             </member>
 102             <member>
 103                 <link linkend="quit">quit</link>
 104             </member>
 105             <member>
 106                 <link linkend="return">return</link>
 107             </member>
 108             <member>
 109                 <link linkend="execstr">execstr</link>
 110             </member>
 111         </simplelist>
 112     </refsection>
 113 </refentry>