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add INPUT/OUTPUT support

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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/branches/gsoc2009-sploving@11325 626c5289-ae23-0410-ae9c-e8d60b6d4f22
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Baozeng Ding 2009-06-27 09:08:23 +00:00
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43
Doc/Manual/Scilab.html
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@ -25,6 +25,7 @@
<li><a href="#scilab_nn10">Global variables</a>
<li><a href="#Scilab_nn11">Constants</a>
<li><a href="#Scilab_nn12">Enums</a>
<li><a href="#Octave_nn13">Pointers</a>
</ul>
</ul>
</div>
@ -297,4 +298,46 @@ scilab:4&gt; printf(" GREEN = %i\n", color.GREEN);
</pre></div>
<H3><a name="Octave_nn13"></a>27.3.5 Pointers</H3>
<p>
Pointers are fully supported by SWIG. One way to deal with the pointers is using the INPUT and OUTPUT typemaps. For example, in order to call C functions as the following:
</p>
<div class="code"><pre>
void sub(int *x, int *y, int *result) {
*result = *x - *y;
}
int divide(int n, int d, int *r) {
int q;
q = n/d;
*r = n - q*d;
return q;
}
</pre></div>
<p> We could write a interface file:
</p>
<div class="code"><pre>%module example
%include typemaps.i
extern void sub(int *INPUT, int *INPUT, int *OUTPUT);
%apply int *OUTPUT { int *r };
extern int divide(int n, int d, int *r);
</pre></div>
<p>Then run it in Scilab:
</p>
<div class="targetlang"><pre>
scilab:1&gt; r = sub(37,42);
scilab:2&gt; printf(" 37 - 42 = %i\n",r);
37 - 42 = -5
scilab:3&gt; [q,r] = divide(42,37);
scilab:4&gt; printf(" 42/37 = %d remainder %d\n",q,r);
42/37 = 1 remainder 5
</pre></div>
<p> From the example above, it is clear that instead of passing a pointer to an object,
we only need a real value instead.
</p>