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/.cvsignore

@@ -0,0 +1,14 @@
+runme
+*_wrap.c
+*_wrap.cxx
+*.iltmp
+*.cs
+*.dll
+*.dsw
+*.exp
+*.lib
+*.ncb
+*.opt
+*.plg
+Release
+Debug

Examples/csharp/funcptr/Makefile

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+TOP        = ../..
+SWIG       = $(TOP)/../swig
+SRCS       = example.c
+TARGET     = example
+INTERFACE  = example.i
+SWIGOPT    =
+CSHARPSRCS = *.cs
+CSHARPFLAGS= -o runme
+
+all::	csharp
+
+csharp::
+	$(MAKE) -f $(TOP)/Makefile SRCS='$(SRCS)' SWIG='$(SWIG)' \
+	SWIGOPT='$(SWIGOPT)' TARGET='$(TARGET)' INTERFACE='$(INTERFACE)' csharp
+	$(MAKE) -f $(TOP)/Makefile CSHARPSRCS='$(CSHARPSRCS)' CSHARPFLAGS='$(CSHARPFLAGS)' csharp_compile
+
+clean::
+	$(MAKE) -f $(TOP)/Makefile csharp_clean
+
+check: all

Examples/csharp/funcptr/example.c

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+/* 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/csharp/funcptr/example.h

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+/* 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);
+

Examples/csharp/funcptr/example.i

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+/* File : example.i */
+%module example
+%{
+#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/csharp/funcptr/runme.cs

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+
+using System;
+using System.Reflection;
+
+public class runme {
+
+  public static void Main(String[] args) {
+
+
+    int a = 37;
+    int b = 42;
+
+    // Now call our C function with a bunch of callbacks
+
+    Console.WriteLine( "Trying some C callback functions" );
+    Console.WriteLine( "    a        = " + a );
+    Console.WriteLine( "    b        = " + b );
+    Console.WriteLine( "    ADD(a,b) = " + example.do_op(a,b,example.ADD) );
+    Console.WriteLine( "    SUB(a,b) = " + example.do_op(a,b,example.SUB) );
+    Console.WriteLine( "    MUL(a,b) = " + example.do_op(a,b,example.MUL) );
+
+    Console.WriteLine( "Here is what the C callback function classes are called in C#" );
+    Console.WriteLine( "    ADD      = " + example.ADD.GetType() );
+    Console.WriteLine( "    SUB      = " + example.SUB.GetType() );
+    Console.WriteLine( "    MUL      = " + example.MUL.GetType() );
+  }
+}