text: 
  // Copyright 2005-2009 Daniel James.
  // 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)
  
  // A non-portable hash function form non-zero floats on x86.
  //
  // Even if you're on an x86 platform, this might not work if their floating
  // point isn't set up as this expects. So this should only be used if it's
  // absolutely certain that it will work.
  
  #if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_X86_HEADER)
  #define BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_X86_HEADER
  
  #include <carve/external/boost/cstdint.hpp>
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1020)
  # pragma once
  #endif
  
  namespace boost
  {
      namespace hash_detail
      {
          inline void hash_float_combine(std::size_t& seed, std::size_t value)
          {
              seed ^= value + (seed<<6) + (seed>>2);
          }
  
          inline std::size_t float_hash_impl(float v)
          {
              boost::uint32_t* ptr = (boost::uint32_t*)&v;
              std::size_t seed = *ptr;
              return seed;
          }
  
          inline std::size_t float_hash_impl(double v)
          {
              boost::uint32_t* ptr = (boost::uint32_t*)&v;
              std::size_t seed = *ptr++;
              hash_float_combine(seed, *ptr);
              return seed;
          }
  
          inline std::size_t float_hash_impl(long double v)
          {
              boost::uint32_t* ptr = (boost::uint32_t*)&v;
              std::size_t seed = *ptr++;
              hash_float_combine(seed, *ptr++);
              hash_float_combine(seed, *(boost::uint16_t*)ptr);
              return seed;
          }
      }
  }
  
  #endif
  