gil/io/get_write_device.hpp

0001 //
0002 // Copyright 2012 Christian Henning
0003 //
0004 // Distributed under the Boost Software License, Version 1.0
0005 // See accompanying file LICENSE_1_0.txt or copy at
0006 // http://www.boost.org/LICENSE_1_0.txt
0007 //
0008 #ifndef BOOST_GIL_IO_GET_WRITE_DEVICE_HPP
0009 #define BOOST_GIL_IO_GET_WRITE_DEVICE_HPP
0010
0011 #include <boost/gil/detail/mp11.hpp>
0012 #include <boost/gil/io/device.hpp>
0013 #include <boost/gil/io/path_spec.hpp>
0014
0015 #include <type_traits>
0016
0017 namespace boost { namespace gil {
0018
0019 template <typename T, typename FormatTag, class Enable = void>
0020 struct get_write_device {};
0021
0022 template <typename Device, typename FormatTag>
0023 struct get_write_device
0024 <
0025     Device,
0026     FormatTag,
0027     typename std::enable_if
0028     <
0029         mp11::mp_and
0030         <
0031             detail::is_adaptable_output_device<FormatTag, Device>,
0032             is_format_tag<FormatTag>
0033         >::value
0034     >::type
0035 >
0036 {
0037     using type =
0038         typename detail::is_adaptable_output_device<FormatTag, Device>::device_type;
0039 };
0040
0041 template <typename String, typename FormatTag>
0042 struct get_write_device
0043 <
0044     String,
0045     FormatTag,
0046     typename std::enable_if
0047     <
0048         mp11::mp_and
0049         <
0050             detail::is_supported_path_spec<String>,
0051             is_format_tag<FormatTag>
0052         >::value
0053     >::type
0054 >
0055 {
0056     using type = detail::file_stream_device<FormatTag>;
0057 };
0058
0059 }} // namespace boost::gil
0060
0061 #endif