[Boost-commit] svn:boost r67593 - sandbox/gil/boost/gil/extension/io2

Subject: [Boost-commit] svn:boost r67593 - sandbox/gil/boost/gil/extension/io2
From: dsaritz_at_[hidden]
Date: 2011-01-02 15:45:40

Author: psiha
Date: 2011-01-02 15:45:39 EST (Sun, 02 Jan 2011)
New Revision: 67593
URL: http://svn.boost.org/trac/boost/changeset/67593

Log:
Improved reader_for diagnostics.
Minor stylistic change.
Text files modified: 
   sandbox/gil/boost/gil/extension/io2/formatted_image.hpp |     8 ++++++--                                
   1 files changed, 6 insertions(+), 2 deletions(-)

Modified: sandbox/gil/boost/gil/extension/io2/formatted_image.hpp
==============================================================================
--- sandbox/gil/boost/gil/extension/io2/formatted_image.hpp	(original)
+++ sandbox/gil/boost/gil/extension/io2/formatted_image.hpp	2011-01-02 15:45:39 EST (Sun, 02 Jan 2011)
@@ -521,7 +521,11 @@
 
     template <typename Source>
     struct reader_for
-        : public mpl::at<typename formatted_image_traits<Impl>::readers, Source> {};
+        : public mpl::at<typename formatted_image_traits<Impl>::readers, Source>
+    {
+        // The backend does not seem to provide a reader for the specified target...
+        BOOST_STATIC_ASSERT(( !is_same<typename reader_for<Source>::type, mpl::void_>::value ));
+    };
 
     template <typename Target>
     struct writer_for
@@ -581,7 +585,7 @@
             :
             base ( image ),
             impl_( impl  )
-            {}
+        {}
 
         template <class Image>
         void apply() { impl_.copy_to( base::apply<Image>(), dimensions_policy(), formats_policy() ); }