[Assorted-commits] SF.net SVN: assorted:[1274] sandbox/trunk/src/cc/forward.cc

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

Revision: 1274
          http://assorted.svn.sourceforge.net/assorted/?rev=1274&view=rev
Author:   yangzhang
Date:     2009-03-09 22:55:47 +0000 (Mon, 09 Mar 2009)

Log Message:
-----------
added demo of forwarding

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

Added: sandbox/trunk/src/cc/forward.cc
===================================================================
--- sandbox/trunk/src/cc/forward.cc	                        (rev 0)
+++ sandbox/trunk/src/cc/forward.cc	2009-03-09 22:55:47 UTC (rev 1274)
@@ -0,0 +1,36 @@
+// Based on the examples given in this (excellent) blog post:
+//
+// <http://blogs.msdn.com/vcblog/archive/2009/02/03/rvalue-references-c-0x-features-in-vc10-part-2.aspx>
+
+#include <iostream>
+#include <string>
+#include <utility>
+using namespace std;
+
+#define mkinner(type) void inner(type x) { cout << #type ": " << x << endl; }
+mkinner(string &)
+mkinner(const string &)
+mkinner(string &&)
+mkinner(const string &&)
+
+template<typename T> void outer(T &&x) { inner(forward<T>(x)); }
+
+string rvalue() { return "rvalue"; }
+const string crvalue() { return "const rvalue"; }
+string lvalue("lvalue");
+const string clvalue("const lvalue");
+
+int main() {
+  outer(lvalue);
+  outer(clvalue);
+  outer(rvalue());
+  outer(crvalue());
+  return 0;
+}
+
+// Output:
+//
+// string &: lvalue
+// string &: const lvalue
+// string &&: rvalue
+// const string &&: const rvalue


This was sent by the SourceForge.net collaborative development platform, the world's largest Open Source development site.