[Assorted-commits] SF.net SVN: assorted:[1196] sandbox/trunk/src/cc/tmpl_virt_fn.cc

[<yan...@us...>]

Revision: 1196
          http://assorted.svn.sourceforge.net/assorted/?rev=1196&view=rev
Author:   yangzhang
Date:     2009-02-18 18:30:53 +0000 (Wed, 18 Feb 2009)

Log Message:
-----------
added demo of templated virtual functions

Added Paths:
-----------
    sandbox/trunk/src/cc/tmpl_virt_fn.cc

Added: sandbox/trunk/src/cc/tmpl_virt_fn.cc
===================================================================
--- sandbox/trunk/src/cc/tmpl_virt_fn.cc	                        (rev 0)
+++ sandbox/trunk/src/cc/tmpl_virt_fn.cc	2009-02-18 18:30:53 UTC (rev 1196)
@@ -0,0 +1,27 @@
+// Demo that you can't have templated virtual functions.
+
+class IWrite {
+    public: 
+    template< typename tMsg > 
+    virtual void write( const tMsg& msg ) = 0;
+};
+
+class Write0 {
+    public: 
+    template< typename tMsg > 
+    virtual void write( const tMsg& msg ) { cout << "Write0" << msg.name(); };
+};
+class Write1 {
+    public: 
+    template< typename tMsg > 
+    virtual void write( const tMsg& msg ) { cout << msg.name(); };
+};
+
+int main( int argc, char** args ) {
+    // here's your function pointer, neatly wrapped inside a vtable :)
+    IWrite* pWriter = argc==1? new Write0 : new Write1;
+
+    pWriter->write( CMsgA() );
+    pWriter->write( CMsgC() );
+    pWriter->write( CMsgB() );
+}


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