text: /*
  (c) 2014 Glen Joseph Fernandes
  <glenjofe -at- gmail.com>
  
  Distributed under the Boost Software
  License, Version 1.0.
  http://boost.org/LICENSE_1_0.txt
  */
  #ifndef BOOST_ALIGN_DETAIL_ALIGN_HPP
  #define BOOST_ALIGN_DETAIL_ALIGN_HPP
  
  #include <boost/assert.hpp>
  #include <boost/align/detail/address.hpp>
  #include <boost/align/detail/is_alignment.hpp>
  #include <cstddef>
  
  namespace boost {
  namespace alignment {
  
  inline void* align(std::size_t alignment, std::size_t size,
      void*& ptr, std::size_t& space)
  {
      BOOST_ASSERT(detail::is_alignment(alignment));
      std::size_t n = detail::address(ptr) & (alignment - 1);
      if (n != 0) {
          n = alignment - n;
      }
      void* p = 0;
      if (n <= space && size <= space - n) {
          p = static_cast<char*>(ptr) + n;
          ptr = p;
          space -= n;
      }
      return p;
  }
  
  } /* .alignment */
  } /* .boost */
  
  #endif
  