add boost on mac

macx64/include/boost/gil/io/get_write_device.hpp

@@ -0,0 +1,62 @@
+//
+// Copyright 2012 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_IO_GET_WRITE_DEVICE_HPP
+#define BOOST_GIL_IO_GET_WRITE_DEVICE_HPP
+
+#include <boost/gil/io/device.hpp>
+#include <boost/gil/io/path_spec.hpp>
+
+#include <boost/mpl/and.hpp>
+
+#include <type_traits>
+
+namespace boost { namespace gil {
+
+template <typename T, typename FormatTag, class Enable = void>
+struct get_write_device {};
+
+template <typename Device, typename FormatTag>
+struct get_write_device
+<
+    Device,
+    FormatTag,
+    typename std::enable_if
+    <
+        mpl::and_
+        <
+            detail::is_adaptable_output_device<FormatTag, Device>,
+            is_format_tag<FormatTag>
+        >::value
+    >::type
+>
+{
+    using type =
+        typename detail::is_adaptable_output_device<FormatTag, Device>::device_type;
+};
+
+template <typename String, typename FormatTag>
+struct get_write_device
+<
+    String,
+    FormatTag,
+    typename std::enable_if
+    <
+        mpl::and_
+        <
+            detail::is_supported_path_spec<String>,
+            is_format_tag<FormatTag>
+        >::value
+    >::type
+>
+{
+    using type = detail::file_stream_device<FormatTag>;
+};
+
+}} // namespace boost::gil
+
+#endif