ceph/src/boost/libs/asio/test/latency/allocator.hpp

   1 //
   2 // allocator.hpp
   3 // ~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef ALLOCATOR_HPP
  12 #define ALLOCATOR_HPP
  13
  14 #include <boost/aligned_storage.hpp>
  15
  16 // Represents a single connection from a client.
  17 class allocator
  18 {
  19 public:
  20   allocator()
  21     : in_use_(false)
  22   {
  23   }
  24
  25   void* allocate(std::size_t n)
  26   {
  27     if (in_use_ || n >= 1024)
  28       return ::operator new(n);
  29     in_use_ = true;
  30     return static_cast<void*>(&space_);
  31   }
  32
  33   void deallocate(void* p)
  34   {
  35     if (p != static_cast<void*>(&space_))
  36       ::operator delete(p);
  37     else
  38       in_use_ = false;
  39   }
  40
  41 private:
  42   allocator(const allocator&);
  43   allocator& operator=(const allocator&);
  44
  45   // Whether the reusable memory space is currently in use.
  46   bool in_use_;
  47
  48   // The reusable memory space made available by the allocator.
  49   boost::aligned_storage<1024>::type space_;
  50 };
  51
  52 #endif // ALLOCATOR_HPP