pointer: add pointer align function

Makefile.am

@@ -250,6 +250,7 @@ UTIL_FILES   =			\
     point.cpp			\
     point.hpp			\
     point.ipp			\
+    pointer.hpp			\
     polynomial.cpp		\
     polynomial.hpp		\
     polynomial.ipp		\

pointer.hpp

@@ -0,0 +1,37 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2011 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifndef __POINTER_HPP
+#define __POINTER_HPP
+
+#include <cstddef>
+#include <cstdint>
+
+
+namespace util {
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename T>
+    T*
+    align (T *_ptr, size_t alignment)
+    {
+        auto ptr = reinterpret_cast<uintptr_t> (_ptr);
+        if (ptr % alignment)
+            ptr += alignment - ptr % alignment;
+        return reinterpret_cast<T*> (ptr);
+    }
+}
+
+#endif