[MATLAB] Added funcptr example

Examples/matlab/funcptr/example.c

@@ -0,0 +1,19 @@
+/* File : example.c */
+
+int do_op(int a, int b, int (*op)(int,int)) {
+  return (*op)(a,b);
+}
+
+int add(int a, int b) {
+  return a+b;
+}
+
+int sub(int a, int b) {
+  return a-b;
+}
+
+int mul(int a, int b) {
+  return a*b;
+}
+
+int (*funcvar)(int,int) = add;

Examples/matlab/funcptr/example.h

@@ -0,0 +1,8 @@
+/* file: example.h */
+
+extern int do_op(int,int, int (*op)(int,int));
+extern int add(int,int);
+extern int sub(int,int);
+extern int mul(int,int);
+
+extern int (*funcvar)(int,int);

Examples/matlab/funcptr/example.i

@@ -0,0 +1,15 @@
+/* File : example.i */
+%module swigexample
+%{
+#include "example.h"
+%}
+
+/* Wrap a function taking a pointer to a function */
+extern int  do_op(int a, int b, int (*op)(int, int));
+
+/* Now install a bunch of "ops" as constants */
+%constant int (*ADD)(int,int) = add;
+%constant int (*SUB)(int,int) = sub;
+%constant int (*MUL)(int,int) = mul;
+
+extern int (*funcvar)(int,int);

Examples/matlab/funcptr/runme.m

@@ -0,0 +1,18 @@
+% file: runme.m
+
+a = 37
+b = 42
+
+% Now call our C function with a bunch of callbacks
+
+disp(sprintf('Trying some C callback functions'))
+disp(sprintf('    a        = %i', a))
+disp(sprintf('    b        = %i', b))
+disp(sprintf('    ADD(a,b) = %i', swigexample.do_op(a,b,swigexample.ADD)))
+disp(sprintf('    SUB(a,b) = %i', swigexample.do_op(a,b,swigexample.SUB)))
+disp(sprintf('    MUL(a,b) = %i', swigexample.do_op(a,b,swigexample.MUL)))
+
+disp(sprintf('Here is what the C callback function objects look like in Octave'))
+swigexample.ADD
+swigexample.SUB
+swigexample.MUL