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+/* Copyright 2003-2013 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See Boost website at http://www.boost.org/
+ */
+
+#ifndef BOOST_DETAIL_ALLOCATOR_UTILITIES_HPP
+#define BOOST_DETAIL_ALLOCATOR_UTILITIES_HPP
+
+#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
+#include <boost/detail/workaround.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <cstddef>
+#include <memory>
+#include <new>
+
+namespace boost{
+
+namespace detail{
+
+/* Allocator adaption layer. Some stdlibs provide allocators without rebind
+ * and template ctors. These facilities are simulated with the external
+ * template class rebind_to and the aid of partial_std_allocator_wrapper.
+ */
+
+namespace allocator{
+
+/* partial_std_allocator_wrapper inherits the functionality of a std
+ * allocator while providing a templatized ctor and other bits missing
+ * in some stdlib implementation or another.
+ */
+
+template<typename Type>
+class partial_std_allocator_wrapper:public std::allocator<Type>
+{
+public:
+  /* Oddly enough, STLport does not define std::allocator<void>::value_type
+   * when configured to work without partial template specialization.
+   * No harm in supplying the definition here unconditionally.
+   */
+
+  typedef Type value_type;
+
+  partial_std_allocator_wrapper(){};
+
+  template<typename Other>
+  partial_std_allocator_wrapper(const partial_std_allocator_wrapper<Other>&){}
+
+  partial_std_allocator_wrapper(const std::allocator<Type>& x):
+    std::allocator<Type>(x)
+  {
+  };
+
+#if defined(BOOST_DINKUMWARE_STDLIB)
+  /* Dinkumware guys didn't provide a means to call allocate() without
+   * supplying a hint, in disagreement with the standard.
+   */
+
+  Type* allocate(std::size_t n,const void* hint=0)
+  {
+    std::allocator<Type>& a=*this;
+    return a.allocate(n,hint);
+  }
+#endif
+
+};
+
+/* Detects whether a given allocator belongs to a defective stdlib not
+ * having the required member templates.
+ * Note that it does not suffice to check the Boost.Config stdlib
+ * macros, as the user might have passed a custom, compliant allocator.
+ * The checks also considers partial_std_allocator_wrapper to be
+ * a standard defective allocator.
+ */
+
+#if defined(BOOST_NO_STD_ALLOCATOR)&&\
+  (defined(BOOST_HAS_PARTIAL_STD_ALLOCATOR)||defined(BOOST_DINKUMWARE_STDLIB))
+
+template<typename Allocator>
+struct is_partial_std_allocator
+{
+  BOOST_STATIC_CONSTANT(bool,
+    value=
+      (is_same<
+        std::allocator<BOOST_DEDUCED_TYPENAME Allocator::value_type>,
+        Allocator
+      >::value)||
+      (is_same<
+        partial_std_allocator_wrapper<
+          BOOST_DEDUCED_TYPENAME Allocator::value_type>,
+        Allocator
+      >::value));
+};
+
+#else
+
+template<typename Allocator>
+struct is_partial_std_allocator
+{
+  BOOST_STATIC_CONSTANT(bool,value=false);
+};
+
+#endif
+
+/* rebind operations for defective std allocators */
+
+template<typename Allocator,typename Type>
+struct partial_std_allocator_rebind_to
+{
+  typedef partial_std_allocator_wrapper<Type> type;
+};
+
+/* rebind operation in all other cases */
+
+template<typename Allocator>
+struct rebinder
+{
+  template<typename Type>
+  struct result
+  {
+      typedef typename Allocator::BOOST_NESTED_TEMPLATE 
+          rebind<Type>::other other;
+  };
+};
+
+template<typename Allocator,typename Type>
+struct compliant_allocator_rebind_to
+{
+  typedef typename rebinder<Allocator>::
+      BOOST_NESTED_TEMPLATE result<Type>::other type;
+};
+
+/* rebind front-end */
+
+template<typename Allocator,typename Type>
+struct rebind_to:
+  mpl::eval_if_c<
+    is_partial_std_allocator<Allocator>::value,
+    partial_std_allocator_rebind_to<Allocator,Type>,
+    compliant_allocator_rebind_to<Allocator,Type>
+  >
+{
+};
+
+/* allocator-independent versions of construct and destroy */
+
+template<typename Type>
+void construct(void* p,const Type& t)
+{
+  new (p) Type(t);
+}
+
+#if BOOST_WORKAROUND(BOOST_MSVC,BOOST_TESTED_AT(1500))
+/* MSVC++ issues spurious warnings about unreferencend formal parameters
+ * in destroy<Type> when Type is a class with trivial dtor.
+ */
+
+#pragma warning(push)
+#pragma warning(disable:4100)  
+#endif
+
+template<typename Type>
+void destroy(const Type* p)
+{
+
+#if BOOST_WORKAROUND(__SUNPRO_CC,BOOST_TESTED_AT(0x590))
+  const_cast<Type*>(p)->~Type();
+#else
+  p->~Type();
+#endif
+
+}
+
+#if BOOST_WORKAROUND(BOOST_MSVC,BOOST_TESTED_AT(1500))
+#pragma warning(pop)
+#endif
+
+} /* namespace boost::detail::allocator */
+
+} /* namespace boost::detail */
+
+} /* namespace boost */
+
+#endif