ceph/src/boost/boost/gil/io/get_write_device.hpp

   1 //
   2 // Copyright 2012 Christian Henning
   3 //
   4 // Distributed under the Boost Software License, Version 1.0
   5 // See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt
   7 //
   8 #ifndef BOOST_GIL_IO_GET_WRITE_DEVICE_HPP
   9 #define BOOST_GIL_IO_GET_WRITE_DEVICE_HPP
  10
  11 #include <boost/gil/detail/mp11.hpp>
  12 #include <boost/gil/io/device.hpp>
  13 #include <boost/gil/io/path_spec.hpp>
  14
  15 #include <type_traits>
  16
  17 namespace boost { namespace gil {
  18
  19 template <typename T, typename FormatTag, class Enable = void>
  20 struct get_write_device {};
  21
  22 template <typename Device, typename FormatTag>
  23 struct get_write_device
  24 <
  25     Device,
  26     FormatTag,
  27     typename std::enable_if
  28     <
  29         mp11::mp_and
  30         <
  31             detail::is_adaptable_output_device<FormatTag, Device>,
  32             is_format_tag<FormatTag>
  33         >::value
  34     >::type
  35 >
  36 {
  37     using type =
  38         typename detail::is_adaptable_output_device<FormatTag, Device>::device_type;
  39 };
  40
  41 template <typename String, typename FormatTag>
  42 struct get_write_device
  43 <
  44     String,
  45     FormatTag,
  46     typename std::enable_if
  47     <
  48         mp11::mp_and
  49         <
  50             detail::is_supported_path_spec<String>,
  51             is_format_tag<FormatTag>
  52         >::value
  53     >::type
  54 >
  55 {
  56     using type = detail::file_stream_device<FormatTag>;
  57 };
  58
  59 }} // namespace boost::gil
  60
  61 #endif