整理

include/boost/predef/library/std/_prefix.h

@@ -0,0 +1,23 @@
+/*
+Copyright Rene Rivera 2008-2013
+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_PREDEF_LIBRARY_STD__PREFIX_H
+#define BOOST_PREDEF_LIBRARY_STD__PREFIX_H
+
+/*
+We need to include an STD header to gives us the context
+of which library we are using. The "smallest" code-wise header
+seems to be <exception>. Boost uses <utility> but as far
+as I can tell (RR) it's not a stand-alone header in most
+implementations. Using <exception> also has the benefit of
+being available in EC++, so we get a chance to make this work
+for embedded users. And since it's not a header impacted by TR1
+there's no magic needed for inclusion in the face of the
+Boost.TR1 library.
+*/
+#include <boost/predef/detail/_exception.h>
+
+#endif