new singleton implementations

include/Singleton.hpp

@@ -1,9 +1,6 @@
 #ifndef SINGLETON_HPP
 #define SINGLETON_HPP
 
-#include "Common.hpp"
-#include "Logger.hpp"
-
 
 template<typename T>
 class Singleton

include/Singleton_DCLP.hpp

@@ -0,0 +1,53 @@
+#ifndef SINGLETON_DCLP_HPP
+#define SINGLETON_DCLP_HPP
+
+#include <mutex>
+
+
+template<typename T>
+class Singleton_DCLP
+{
+protected:
+
+    Singleton_DCLP() {};
+    virtual ~Singleton_DCLP() {};
+
+private:
+
+    Singleton_DCLP( const Singleton_DCLP& );
+    Singleton_DCLP& operator=( const Singleton_DCLP& );
+
+public:
+
+    static T* getInstance()
+    {
+      if ( not m_instance )
+      {
+        std::lock_guard<std::mutex> guard(m_lock);
+
+        // this is now the critical section
+
+        if ( not m_instance ) // re-check pinstance
+        {
+          // Douglas Schmidt proposed volatile
+          // to prevent "agressive optimalizations"
+          volatile T *temp = new T();
+          m_instance = (T*)temp;
+        }
+      }
+
+      return m_instance;
+    }
+
+
+private:
+
+    static std::mutex m_lock;
+    static T* m_instance;
+};
+
+template<class T> std::mutex Singleton_DCLP<T>::m_lock;
+template<class T> T* Singleton_DCLP<T>::m_instance = 0;
+
+
+#endif // SINGLETON_DCLP_HPP

include/Singleton_meyers.hpp

@@ -0,0 +1,28 @@
+#ifndef SINGLETON_MEYERS_HPP
+#define SINGLETON_MEYERS_HPP
+
+template<typename T>
+class Singleton_meyers
+{
+protected:
+
+    Singleton_meyers() {};
+    virtual ~Singleton_meyers() {};
+
+private:
+
+    Singleton_meyers( const Singleton_meyers& );
+    Singleton_meyers& operator=( const Singleton_meyers& );
+
+public:
+
+    inline static T* getInstance()
+    {
+      /// @note static local initialization is thread safe in c++011
+      static T instance;
+      return &instance;
+    }
+};
+
+
+#endif // SINGLETON_MEYERS_HPP

src/Logger.cpp

@@ -3,6 +3,8 @@
 #include <time.h> //time
 #include "Colors.hpp"
 
+#include "Common.hpp"
+
 
 void Logger::init(std::ostream& log_stream )
 {

test/CMakeLists.txt

@@ -1,5 +1,5 @@
 set (CXX_FLAGS "-Wall -Wextra -pedantic -Weffc++ -Wshadow "
-               "-ggdb -fprofile-arcs -ftest-coverage " )
+               "-ggdb -fprofile-arcs -ftest-coverage --std=c++0x " )
 
 add_definitions( ${CXX_FLAGS} )
 # add_definitions( -DNO_TRACE )
@@ -16,15 +16,17 @@ if(CXXTEST_FOUND)
   generated_main.cpp
   Fixture.hpp
 
-  test_Singelton.hpp
-  test_Mutex.hpp
-  test_ScopedLock.hpp
-  test_ConditionalVariable.hpp
-  test_Thread.hpp
-  test_ThreadPool.hpp
-  test_Semaphore.hpp
-  test_Timer.hpp
-  test_Common.hpp
+   test_Singleton.hpp
+   test_Singleton_meyers.hpp
+   test_Singleton_DCLP.hpp
+#   test_Mutex.hpp
+#   test_ScopedLock.hpp
+#   test_ConditionalVariable.hpp
+#   test_Thread.hpp
+#   test_ThreadPool.hpp
+#   test_Semaphore.hpp
+#   test_Timer.hpp
+#   test_Common.hpp
 #   test_TimerThreadMultimap.hpp
   )
   target_link_libraries(test CppUtils gcov)

test/run_test.sh

@@ -46,6 +46,9 @@ rm -f ./leak.log.core.*
 # cxxtest output
 rm -f $test.out
 
+#rm $(find .. -name *.gcda)
+find .. -name *.gcda -exec rm -rf {} \;
+
 
 echo -e "${pre}Run tests${post}"
 

test/test_Singelton_DCLP.hpp

@@ -0,0 +1,35 @@
+#include <cxxtest/TestSuite.h>
+
+#define private public // need to reach Singleton's private m_instance
+
+#include "Common.hpp"
+#include "Fixture.hpp"
+#include "Singleton_DCLP.hpp"
+
+
+class TestSingletonDCLPSuite : public CxxTest::TestSuite
+{
+
+private:
+
+  class BasicSingleton : public Singleton_DCLP<BasicSingleton>
+  {
+    public:
+      int getSeven()
+      {
+        TRACE;
+        return 7;
+      }
+  };
+
+public:
+
+  void testBasic( void )
+  {
+    TEST_HEADER;
+
+    TS_ASSERT_EQUALS( BasicSingleton::getInstance()->getSeven(), 7 );
+  }
+
+
+};

test/test_Singleton_DCLP.hpp

@@ -0,0 +1,35 @@
+#include <cxxtest/TestSuite.h>
+
+#define private public // need to reach Singleton's private m_instance
+
+#include "Common.hpp"
+#include "Fixture.hpp"
+#include "Singleton_DCLP.hpp"
+
+
+class TestSingletonDCLPSuite : public CxxTest::TestSuite
+{
+
+private:
+
+  class BasicSingleton : public Singleton_DCLP<BasicSingleton>
+  {
+    public:
+      int getSeven()
+      {
+        TRACE;
+        return 7;
+      }
+  };
+
+public:
+
+  void testBasic( void )
+  {
+    TEST_HEADER;
+
+    TS_ASSERT_EQUALS( BasicSingleton::getInstance()->getSeven(), 7 );
+  }
+
+
+};

test/test_Singleton_meyers.hpp

@@ -0,0 +1,35 @@
+#include <cxxtest/TestSuite.h>
+
+#define private public // need to reach Singleton's private m_instance
+
+#include "Common.hpp"
+#include "Fixture.hpp"
+#include "Singleton_meyers.hpp"
+
+
+class TestSingletonMeyersSuite : public CxxTest::TestSuite
+{
+
+private:
+
+  class BasicSingleton : public Singleton_meyers<BasicSingleton>
+  {
+    public:
+      int getSeven()
+      {
+        TRACE;
+        return 7;
+      }
+  };
+
+public:
+
+  void testBasic( void )
+  {
+    TEST_HEADER;
+
+    TS_ASSERT_EQUALS( BasicSingleton::getInstance()->getSeven(), 7 );
+  }
+
+
+};