Generate data from a TypeList and Unit Template

git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@53 7ec92016-0320-0410-acc4-a06ded1c099a

Reference/DataGenerators.h

@@ -0,0 +1,92 @@
+////////////////////////////////////////////////////////////////////////////////
+// The Loki Library
+// Data Generator by Shannon Barber
+// This code DOES NOT accompany the book:
+// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design 
+//     Patterns Applied". Copyright (c) 2001. Addison-Wesley.
+//
+// Code covered by the MIT License
+////////////////////////////////////////////////////////////////////////////////
+
+#include "TypeList.h"
+
+/************************************************************************************
+// class template GenData
+// Iteratates a TypeList, and invokes the functor GenFunc<T>
+// for each type in the list, passing a functor along the way.
+// The functor is designed to be an insertion iterator which GenFunc<T>
+// can use to output information about the types in the list.
+//
+
+Example Use
+
+template<typename T>
+struct ExtractDataType
+	{
+	some_type operator()()
+		{
+		return create_value_from_type<T>;
+		}
+	};
+
+Loki::GenData<parameter_tl, ExtractDataType> gen;
+std::vector<user_defined_type> stuff;
+gen(std::back_inserter(stuff));
+*******************************************************************************/
+namespace Loki
+{
+	namespace TL
+		{
+		template<typename T>
+		struct name_from_type
+			{
+			const char* operator()()
+				{
+				return typeid(T).name();
+				}
+			};
+
+    template <class TList, template <class> class GenFunc>
+    struct IterateTypes;
+     
+    template <class T1, class T2, template <class> class GenFunc>
+    struct IterateTypes<Typelist<T1, T2>, GenFunc>
+        : public IterateTypes<T1, GenFunc>
+        , public IterateTypes<T2, GenFunc>
+    {
+    template<class II>
+    void operator()(II& ii)
+        {
+        typedef IterateTypes<T1, GenFunc> head_t;
+        typedef IterateTypes<T2, GenFunc> tail_t;
+        head_t::operator()(ii);
+		tail_t::operator()(ii);
+		}
+    };
+     
+    template <class AtomicType, template <class> class GenFunc>
+    struct IterateTypes
+    {
+    template<class II>
+    void operator()(II& ii)
+        {
+        typedef GenFunc<AtomicType> genfunc_t;
+        *ii = genfunc_t()();
+        ++ii;
+        }
+    };
+    
+    template <template <class> class GenFunc>
+    struct IterateTypes<NullType, GenFunc>
+    {
+    template<class II>
+    void operator()(II& ii)
+        {}
+    };
+	}//ns TL
+}//ns Loki
+
+////////////////////////////////////////////////////////////////////////////////
+// Change log:
+// 9/20/02 Named changed from GenData to IterateTypes
+////////////////////////////////////////////////////////////////////////////////