multiton class added

include/Multiton.hpp

@@ -0,0 +1,69 @@
+#ifndef MULTITON_H
+#define MULTITON_H
+
+#include <map>
+
+// http://stackoverflow.com/questions/2346091/c-templated-class-implementation-of-the-multiton-pattern
+
+/// @note Not thread-safe! Use some concurrent map!
+
+template <typename Key, typename T> class Multiton
+{
+public:
+
+    static T& getRef( const Key& key )
+    {
+        return *getPtr(key);
+    }
+
+    static T* getPtr( const Key& key )
+    {
+        typename std::map<Key, T*>::const_iterator it = m_instances.find(key);
+
+        if ( it != m_instances.end() ) {
+            return (T*)(it->second);
+        }
+
+        T* instance = new T;
+        m_instances[key] = instance;
+        return instance;
+    }
+
+    static bool remove( const Key& key )
+    {
+        typename std::map<Key, T*>::const_iterator it = m_instances.find(key);
+
+        if ( it == m_instances.end() ) {
+            return false;
+        }
+
+        delete (*it).second;
+        m_instances.remove(it);
+        return true;
+    }
+
+    static void destroy()
+    {
+        typename std::map<Key, T*>::const_iterator it;
+        for ( it = m_instances.begin(); it != m_instances.end(); ++it ) {
+            delete (*it).second;
+        }
+        m_instances.clear();
+    }
+
+protected:
+
+    Multiton() {}
+
+    virtual ~Multiton() {}
+
+private:
+    Multiton(const Multiton&) {}
+    Multiton& operator= (const Multiton&) { return *this; }
+
+    static std::map<Key, T*> m_instances;
+};
+
+template <typename Key, typename T> std::map<Key, T*> Multiton<Key, T>::m_instances;
+
+#endif // MULTITON_H

test/CMakeLists.txt

@@ -16,9 +16,10 @@ if(CXXTEST_FOUND)
   generated_main.cpp
   Fixture.hpp
 
-   test_Singleton.hpp
-   test_Singleton_meyers.hpp
-   test_Singleton_DCLP.hpp
+  test_Multiton.hpp
+#    test_Singleton.hpp
+#    test_Singleton_meyers.hpp
+#    test_Singleton_DCLP.hpp
 #   test_Mutex.hpp
 #   test_ScopedLock.hpp
 #   test_ConditionalVariable.hpp

test/test_Multiton.hpp

@@ -0,0 +1,38 @@
+#include <cxxtest/TestSuite.h>
+
+#include "Common.hpp"
+#include "Fixture.hpp"
+#include "Multiton.hpp"
+
+
+class TestMultitonSuite : public CxxTest::TestSuite
+{
+
+private:
+
+    class Dummy
+    {
+    public:
+        void sayHi() {  LOG( Logger::FINEST, "Hi there!"); }
+
+    };
+
+    class DummyMultiton : public Multiton<std::string, Dummy>
+    {
+
+    };
+
+public:
+
+  void testBasic( void )
+  {
+    TEST_HEADER;
+
+    DummyMultiton::getRef("foobar").sayHi();
+    DummyMultiton::getPtr("foobar")->sayHi();
+
+    DummyMultiton::destroy();
+  }
+
+
+};