Imported existing code

libraries/include/boost/asio/detail/handler_alloc_helpers.hpp

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+//
+// handler_alloc_helpers.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// 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)
+//
+
+#ifndef BOOST_ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP
+#define BOOST_ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <boost/detail/workaround.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/handler_alloc_hook.hpp>
+#include <boost/asio/detail/noncopyable.hpp>
+
+// Calls to asio_handler_allocate and asio_handler_deallocate must be made from
+// a namespace that does not contain any overloads of these functions. The
+// boost_asio_handler_alloc_helpers namespace is defined here for that purpose.
+namespace boost_asio_handler_alloc_helpers {
+
+template <typename Handler>
+inline void* allocate(std::size_t s, Handler* h)
+{
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+  return ::operator new(s);
+#else
+  using namespace boost::asio;
+  return asio_handler_allocate(s, h);
+#endif
+}
+
+template <typename Handler>
+inline void deallocate(void* p, std::size_t s, Handler* h)
+{
+#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))
+  ::operator delete(p);
+#else
+  using namespace boost::asio;
+  asio_handler_deallocate(p, s, h);
+#endif
+}
+
+} // namespace boost_asio_handler_alloc_helpers
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+// Traits for handler allocation.
+template <typename Handler, typename Object>
+struct handler_alloc_traits
+{
+  typedef Handler handler_type;
+  typedef Object value_type;
+  typedef Object* pointer_type;
+  BOOST_STATIC_CONSTANT(std::size_t, value_size = sizeof(Object));
+};
+
+template <typename Alloc_Traits>
+class handler_ptr;
+
+// Helper class to provide RAII on uninitialised handler memory.
+template <typename Alloc_Traits>
+class raw_handler_ptr
+  : private noncopyable
+{
+public:
+  typedef typename Alloc_Traits::handler_type handler_type;
+  typedef typename Alloc_Traits::value_type value_type;
+  typedef typename Alloc_Traits::pointer_type pointer_type;
+  BOOST_STATIC_CONSTANT(std::size_t, value_size = Alloc_Traits::value_size);
+
+  // Constructor allocates the memory.
+  raw_handler_ptr(handler_type& handler)
+    : handler_(handler),
+      pointer_(static_cast<pointer_type>(
+            boost_asio_handler_alloc_helpers::allocate(value_size, &handler_)))
+  {
+  }
+
+  // Destructor automatically deallocates memory, unless it has been stolen by
+  // a handler_ptr object.
+  ~raw_handler_ptr()
+  {
+    if (pointer_)
+      boost_asio_handler_alloc_helpers::deallocate(
+          pointer_, value_size, &handler_);
+  }
+
+private:
+  friend class handler_ptr<Alloc_Traits>;
+  handler_type& handler_;
+  pointer_type pointer_;
+};
+
+// Helper class to provide RAII on uninitialised handler memory.
+template <typename Alloc_Traits>
+class handler_ptr
+  : private noncopyable
+{
+public:
+  typedef typename Alloc_Traits::handler_type handler_type;
+  typedef typename Alloc_Traits::value_type value_type;
+  typedef typename Alloc_Traits::pointer_type pointer_type;
+  BOOST_STATIC_CONSTANT(std::size_t, value_size = Alloc_Traits::value_size);
+  typedef raw_handler_ptr<Alloc_Traits> raw_ptr_type;
+
+  // Take ownership of existing memory.
+  handler_ptr(handler_type& handler, pointer_type pointer)
+    : handler_(handler),
+      pointer_(pointer)
+  {
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  handler_ptr(raw_ptr_type& raw_ptr)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type)
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3, a4))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4,
+      Arg5& a5)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3, a4, a5))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5, typename Arg6>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4,
+      Arg5& a5, Arg6& a6)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3, a4, a5, a6))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5, typename Arg6, typename Arg7>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4,
+      Arg5& a5, Arg6& a6, Arg7& a7)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(a1, a2, a3, a4, a5, a6, a7))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Construct object in raw memory and take ownership if construction succeeds.
+  template <typename Arg1, typename Arg2, typename Arg3, typename Arg4,
+      typename Arg5, typename Arg6, typename Arg7, typename Arg8>
+  handler_ptr(raw_ptr_type& raw_ptr, Arg1& a1, Arg2& a2, Arg3& a3, Arg4& a4,
+      Arg5& a5, Arg6& a6, Arg7& a7, Arg8& a8)
+    : handler_(raw_ptr.handler_),
+      pointer_(new (raw_ptr.pointer_) value_type(
+            a1, a2, a3, a4, a5, a6, a7, a8))
+  {
+    raw_ptr.pointer_ = 0;
+  }
+
+  // Destructor automatically deallocates memory, unless it has been released.
+  ~handler_ptr()
+  {
+    reset();
+  }
+
+  // Get the memory.
+  pointer_type get() const
+  {
+    return pointer_;
+  }
+
+  // Release ownership of the memory.
+  pointer_type release()
+  {
+    pointer_type tmp = pointer_;
+    pointer_ = 0;
+    return tmp;
+  }
+
+  // Explicitly destroy and deallocate the memory.
+  void reset()
+  {
+    if (pointer_)
+    {
+      pointer_->value_type::~value_type();
+      boost_asio_handler_alloc_helpers::deallocate(
+          pointer_, value_size, &handler_);
+      pointer_ = 0;
+    }
+  }
+
+private:
+  handler_type& handler_;
+  pointer_type pointer_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_HANDLER_ALLOC_HELPERS_HPP