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diff --git a/boost/gil/io/typedefs.hpp b/boost/gil/io/typedefs.hpp
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+/*
+    Copyright 2007-2008 Christian Henning
+    Use, modification and distribution are subject to 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_IO_TYPEDEFS_HPP
+#define BOOST_GIL_IO_TYPEDEFS_HPP
+
+////////////////////////////////////////////////////////////////////////////////////////
+/// \file
+/// \brief
+/// \author Christian Henning \n
+///
+/// \date   2007-2008 \n
+///
+////////////////////////////////////////////////////////////////////////////////////////
+
+#include <vector>
+
+#include <boost/type_traits/is_base_of.hpp>
+
+#include <boost/gil/image.hpp>
+#include <boost/gil/utilities.hpp>
+
+#ifdef BOOST_GIL_IO_ENABLE_GRAY_ALPHA
+#include <boost/gil/extension/toolbox/color_spaces/gray_alpha.hpp>
+#endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA
+
+namespace boost { namespace gil { 
+
+struct double_zero { static double apply() { return 0.0; } };
+struct double_one  { static double apply() { return 1.0; } };
+
+typedef unsigned char byte_t;
+typedef std::vector< byte_t > byte_vector_t;
+
+typedef point2< std::ptrdiff_t > point_t;
+
+} // namespace gil
+} // namespace boost
+
+namespace boost { 
+
+template<> struct is_floating_point<gil::float32_t> : mpl::true_ {};
+template<> struct is_floating_point<gil::float64_t> : mpl::true_ {};
+
+} // namespace boost
+
+namespace boost { namespace gil {
+
+///@todo We should use boost::preprocessor here.
+
+typedef bit_aligned_image1_type<  1, gray_layout_t >::type gray1_image_t;
+typedef bit_aligned_image1_type<  2, gray_layout_t >::type gray2_image_t;
+typedef bit_aligned_image1_type<  4, gray_layout_t >::type gray4_image_t;
+typedef bit_aligned_image1_type<  6, gray_layout_t >::type gray6_image_t;
+typedef bit_aligned_image1_type< 10, gray_layout_t >::type gray10_image_t;
+typedef bit_aligned_image1_type< 12, gray_layout_t >::type gray12_image_t;
+typedef bit_aligned_image1_type< 14, gray_layout_t >::type gray14_image_t;
+typedef bit_aligned_image1_type< 24, gray_layout_t >::type gray24_image_t;
+
+typedef pixel< double, gray_layout_t       > gray64f_pixel_t;
+
+#ifdef BOOST_GIL_IO_ENABLE_GRAY_ALPHA
+typedef pixel<  uint8_t, gray_alpha_layout_t > gray_alpha8_pixel_t;
+typedef pixel< uint16_t, gray_alpha_layout_t > gray_alpha16_pixel_t;
+typedef pixel<   double, gray_alpha_layout_t > gray_alpha64f_pixel_t;
+#endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA
+
+typedef pixel< double, rgb_layout_t        > rgb64f_pixel_t;
+typedef pixel< double, rgba_layout_t       > rgba64f_pixel_t;
+typedef image< gray64f_pixel_t      , false > gray64f_image_t;
+
+#ifdef BOOST_GIL_IO_ENABLE_GRAY_ALPHA
+typedef image<  gray_alpha8_pixel_t, false  > gray_alpha8_image_t;
+typedef image<  gray_alpha16_pixel_t, false > gray_alpha16_image_t;
+typedef image< gray_alpha32f_pixel_t, false > gray_alpha32f_image_t;
+typedef image< gray_alpha32f_pixel_t, true  > gray_alpha32f_planar_image_t;
+typedef image< gray_alpha64f_pixel_t, false > gray_alpha64f_image_t;
+typedef image< gray_alpha64f_pixel_t, true  > gray_alpha64f_planar_image_t;
+
+#endif // BOOST_GIL_IO_ENABLE_GRAY_ALPHA
+
+typedef image< rgb64f_pixel_t       , false > rgb64f_image_t;
+typedef image< rgb64f_pixel_t       , true  > rgb64f_planar_image_t;
+typedef image< rgba64f_pixel_t      , false > rgba64f_image_t;
+typedef image< rgba64f_pixel_t      , true  > rgba64f_planar_image_t;
+
+} // namespace gil
+} // namespace boost
+
+#endif