add DeletableSingleton policy and examples from Curtis Krauskopf's CUJ article 'Creating Dynamic Singletons & the Loki Library' - www.decompile.com

git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@307 7ec92016-0320-0410-acc4-a06ded1c099a

test/Singleton/Phoenix.cpp

@@ -0,0 +1,91 @@
+////////////////////////////////////////////////////////////////////////////////
+// The Loki Library
+// Copyright (c) 2005 by Curtis Krauskopf
+// Copyright (c) 2005 by Peter Kuemmel
+//
+// Code covered by the MIT License
+// The authors make no representations about the suitability of this software
+// for any purpose. It is provided "as is" without express or implied warranty.
+////////////////////////////////////////////////////////////////////////////////
+
+// A singleton Log object that resurrects itself after
+// it has been automatically destroyed during program
+// termination.  When a dead-reference to the Log
+// singleton is detected, it is resurrected automatically.
+//
+// Expected output:
+//   Example c'tor
+//   Log c'tor
+//   Log now instantiated.
+//   Log d'tor
+//   Example d'tor starting
+//   Log c'tor
+//   Log: inside Example d'tor
+//   Example d'tor finished
+//
+// The last line of the output only appears when this
+// program is compiled with the ATEXIT_FIXED symbol
+// defined (see the Loki library and the CUJ article).
+//
+
+#include <iostream>
+#include "loki/Singleton.h"   // for Loki::SingletonHolder
+
+using namespace std;   // okay for small programs
+using namespace Loki;  // okay for small programs
+
+class Log
+{
+public:
+    Log()
+    {
+        echo("Log c'tor");
+    }
+    ~Log()
+    {
+        echo("Log d'tor");
+    }
+    void echo(const char *s)
+    {
+        cout << s << endl;
+    }
+};
+
+typedef SingletonHolder<Log, CreateUsingNew, PhoenixSingleton> log;
+
+
+// A generic example class that stores and echoes a const char.
+//
+class Example
+{
+public:
+    Example()
+    {
+        echo("Example c'tor");
+    }
+    ~Example()
+    {
+        echo("Example d'tor starting");
+        log::Instance().echo("Log: inside Example d'tor");
+        echo("Example d'tor finished");
+    }
+    void echo(const char *s)
+    {
+        cout << s << endl;
+    }
+};
+
+
+int main(int argc, char* argv[])
+{
+    Example *example = new Example();
+     SetLongevity<Example, void (*)(Example*)>(example, 1, &Loki::Private::Deleter<Example>::Delete);
+    log::Instance().echo("Log now instantiated.");
+    
+#if defined(__BORLANDC__) || defined(__GNUC__) || defined(_MSC_VER)
+    system("pause"); // Stop console window from closing if run from IDE.
+#endif
+
+    return 0;
+}
+