[Assorted-commits] SF.net SVN: assorted:[1060] sandbox/trunk/src/cc/overload_new.cc

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

Revision: 1060
          http://assorted.svn.sourceforge.net/assorted/?rev=1060&view=rev
Author:   yangzhang
Date:     2008-11-06 08:43:12 +0000 (Thu, 06 Nov 2008)

Log Message:
-----------
added overloading of operator new

Modified Paths:
--------------
    sandbox/trunk/src/cc/overload_new.cc

Modified: sandbox/trunk/src/cc/overload_new.cc
===================================================================
--- sandbox/trunk/src/cc/overload_new.cc	2008-11-06 08:42:43 UTC (rev 1059)
+++ sandbox/trunk/src/cc/overload_new.cc	2008-11-06 08:43:12 UTC (rev 1060)
@@ -60,17 +60,57 @@
     }
 };
 
+// You can add extra parameters to operator new.
+
+void *
+operator new(std::size_t sz, const char file[16], int line)
+throw(std::bad_alloc)
+{
+  std::cout << "calling operator new at " << file << ':' << line << std::endl;
+  return operator new(sz);
+}
+
+class D
+{
+  public:
+    int x;
+};
+
 int
 main()
 {
   // You can actually call operator new directly anywhere.
   void *p = operator new(1024);
-  C *c = new C;
+  std::cout << std::endl;
+
+  // Use C's operator new.
+  C *a = new C;
+  std::cout << std::endl;
+
+  // This won't work since we didn't extend C's operator new.
+  // C *b = new(__FILE__, __LINE__) C;
+
+  // Use the extended operator new.
+  D *b = new(__FILE__, __LINE__) D;
+  std::cout << std::endl;
+
+  // Permanently change what 'new' means.
+#define new new(__FILE__, __LINE__)
+  D *c = new D;
+  std::cout << std::endl;
+
   return 0;
 }
 
 // Output:
 //
 // calling operator new that throws exceptions
+//
 // calling C::operator new
 // calling operator new that throws exceptions
+//
+// calling operator new at overload_new.cc:94
+// calling operator new that throws exceptions
+//
+// calling operator new at overload_new.cc:99
+// calling operator new that throws exceptions


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