text: //
  // Copyright 2009 Christian Henning
  //
  // 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_GIL_EXTENSION_IO_RAW_DETAIL_IS_ALLOWED_HPP
  #define BOOST_GIL_EXTENSION_IO_RAW_DETAIL_IS_ALLOWED_HPP
  
  #include <boost/gil/extension/io/raw/tags.hpp>
  #include <boost/gil/io/base.hpp>
  
  namespace boost { namespace gil { namespace detail {
  
  template< typename View >
  bool is_allowed( const image_read_info< raw_tag >& info
                 , mpl::true_   // is read_and_no_convert
                 )
  {
      using pixel_t = typename get_pixel_type<View>::type;
      using num_channel_t = typename num_channels<pixel_t>::value_type;
      using channel_t = typename channel_traits<typename element_type<typename View::value_type>::type>::value_type;
  
      const num_channel_t dst_samples_per_pixel = num_channels< pixel_t >::value;
      const unsigned int  dst_bits_per_pixel    = detail::unsigned_integral_num_bits< channel_t >::value;
      const bool          is_type_signed        = boost::is_signed< channel_t >::value;
  
      return( dst_samples_per_pixel == info._samples_per_pixel &&
              dst_bits_per_pixel    == static_cast<unsigned int>(info._bits_per_pixel) &&
              !is_type_signed );
  }
  
  template< typename View >
  bool is_allowed( const image_read_info< raw_tag >& /* info */
                 , mpl::false_  // is read_and_convert
                 )
  {
      return true;
  }
  
  } // namespace detail
  } // namespace gil
  } // namespace boost
  
  #endif
  