update swig on windows

winx64/bin/swigwin-4.0.0/Examples/octave/funcptr2/Makefile

@@ -0,0 +1,3 @@
+SRCS = example.c
+
+include $(SRCDIR)../example.mk

winx64/bin/swigwin-4.0.0/Examples/octave/funcptr2/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;

winx64/bin/swigwin-4.0.0/Examples/octave/funcptr2/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);

winx64/bin/swigwin-4.0.0/Examples/octave/funcptr2/example.i

@@ -0,0 +1,20 @@
+/* File : example.i */
+%module swigexample
+
+%feature("autodoc", 1);
+
+%{
+#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 */
+%callback("%(upper)s");
+int add(int, int);
+int sub(int, int);
+int mul(int, int);
+%nocallback;
+
+extern int (*funcvar)(int,int);

winx64/bin/swigwin-4.0.0/Examples/octave/funcptr2/runme.m

@@ -0,0 +1,27 @@
+# do not dump Octave core
+if exist("crash_dumps_octave_core", "builtin")
+  crash_dumps_octave_core(0);
+endif
+
+swigexample
+
+a = 37
+b = 42
+
+# Now call our C function with a bunch of callbacks
+
+printf("Trying some C callback functions\n");
+printf("    a        = %i\n", a);
+printf("    b        = %i\n", b);
+printf("    ADD(a,b) = %i\n", swigexample.do_op(a,b,swigexample.ADD));
+printf("    SUB(a,b) = %i\n", swigexample.do_op(a,b,swigexample.SUB));
+printf("    MUL(a,b) = %i\n", swigexample.do_op(a,b,swigexample.MUL));
+
+printf("Here is what the C callback function objects look like in Octave\n");
+swigexample.ADD
+swigexample.SUB
+swigexample.MUL
+
+printf("Call the functions directly...\n");
+printf("    add(a,b) = %i\n", swigexample.add(a,b));
+printf("    sub(a,b) = %i\n", swigexample.sub(a,b));