update swig on windows

winx64/bin/swigwin-4.0.0/Examples/go/funcptr/runme.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+
+	. "example"
+)
+
+func main() {
+	a := 37
+	b := 42
+
+	// Now call our C function with a bunch of callbacks
+
+	fmt.Println("Trying some C callback functions")
+	fmt.Println("    a        = ", a)
+	fmt.Println("    b        = ", b)
+	fmt.Println("    ADD(a,b) = ", Do_op(a, b, ADD))
+	fmt.Println("    SUB(a,b) = ", Do_op(a, b, SUB))
+	fmt.Println("    MUL(a,b) = ", Do_op(a, b, MUL))
+
+	fmt.Println("Here is what the C callback function classes are called in Go")
+	fmt.Println("    ADD      = ", ADD)
+	fmt.Println("    SUB      = ", SUB)
+	fmt.Println("    MUL      = ", MUL)
+}