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+//
+// detail/thread_info_base.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2014 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_THREAD_INFO_BASE_HPP
+#define BOOST_ASIO_DETAIL_THREAD_INFO_BASE_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <climits>
+#include <cstddef>
+#include <boost/asio/detail/noncopyable.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class thread_info_base
+ : private noncopyable
+{
+public:
+ thread_info_base()
+ : reusable_memory_(0)
+ {
+ }
+
+ ~thread_info_base()
+ {
+ if (reusable_memory_)
+ ::operator delete(reusable_memory_);
+ }
+
+ static void* allocate(thread_info_base* this_thread, std::size_t size)
+ {
+ if (this_thread && this_thread->reusable_memory_)
+ {
+ void* const pointer = this_thread->reusable_memory_;
+ this_thread->reusable_memory_ = 0;
+
+ unsigned char* const mem = static_cast<unsigned char*>(pointer);
+ if (static_cast<std::size_t>(mem[0]) >= size)
+ {
+ mem[size] = mem[0];
+ return pointer;
+ }
+
+ ::operator delete(pointer);
+ }
+
+ void* const pointer = ::operator new(size + 1);
+ unsigned char* const mem = static_cast<unsigned char*>(pointer);
+ mem[size] = (size <= UCHAR_MAX) ? static_cast<unsigned char>(size) : 0;
+ return pointer;
+ }
+
+ static void deallocate(thread_info_base* this_thread,
+ void* pointer, std::size_t size)
+ {
+ if (size <= UCHAR_MAX)
+ {
+ if (this_thread && this_thread->reusable_memory_ == 0)
+ {
+ unsigned char* const mem = static_cast<unsigned char*>(pointer);
+ mem[0] = mem[size];
+ this_thread->reusable_memory_ = pointer;
+ return;
+ }
+ }
+
+ ::operator delete(pointer);
+ }
+
+private:
+ void* reusable_memory_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_THREAD_INFO_BASE_HPP