1 files changed, 31 insertions, 0 deletions
diff --git a/ipl/packs/loadfuncpp/doc/isexternal.cpp b/ipl/packs/loadfuncpp/doc/isexternal.cpp
new file mode 100644
index 0000000..ef5d219
--- /dev/null
+++ b/ipl/packs/loadfuncpp/doc/isexternal.cpp
@@ -0,0 +1,31 @@
+
+
+/* Example of a C++ extension to icon via loadfunc,
+ * without garbage collection difficulties.
+ * Type 'make iexample' to build.
+ * Carl Sturtivant, 2008/3/16
+ */
+
+
+#include "loadfuncpp.h"
+using namespace Icon;
+
+class myval: public external {
+  public:
+	virtual value name() { return "my external"; }
+};
+
+extern "C" int myext(value argv[]) {
+	argv[0] = new myval();
+	return SUCCEEDED;
+}
+
+extern "C" int ismine(value argv[]) {
+	if( argv[1].isExternal("my external") )
+		argv[0] = "Yes!";
+	else
+		argv[0] = "No!";
+    return SUCCEEDED;
+}
+
+