Function pointer example just like the other languages

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@4528 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/csharp/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;