allocator.hpp
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//
// allocator.hpp
// ~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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 ALLOCATOR_HPP
#define ALLOCATOR_HPP
#include <boost/aligned_storage.hpp>
// Represents a single connection from a client.
class allocator
{
public:
allocator()
: in_use_(false)
{
}
void* allocate(std::size_t n)
{
if (in_use_ || n >= 1024)
return ::operator new(n);
in_use_ = true;
return static_cast<void*>(&space_);
}
void deallocate(void* p)
{
if (p != static_cast<void*>(&space_))
::operator delete(p);
else
in_use_ = false;
}
private:
allocator(const allocator&);
allocator& operator=(const allocator&);
// Whether the reusable memory space is currently in use.
bool in_use_;
// The reusable memory space made available by the allocator.
boost::aligned_storage<1024>::type space_;
};
#endif // ALLOCATOR_HPP