Merging in changes trunk updates: adding standard error_info typedefs, updating the documentation.

[SVN r55094]

include/boost/exception/errinfo_errno.hpp

@@ -0,0 +1,35 @@
+//Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc.
+
+//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 UUID_F0EE17BE6C1211DE87FF459155D89593
+#define UUID_F0EE17BE6C1211DE87FF459155D89593
+
+#include "boost/exception/info.hpp"
+#include <errno.h>
+#include <string.h>
+
+namespace
+boost
+    {
+    typedef error_info<struct errinfo_errno_,int> errinfo_errno;
+
+    //Usage hint:
+    //if( c_function(....)!=0 )
+    //    BOOST_THROW_EXCEPTION(
+    //        failure() <<
+    //        errinfo_errno(errno) <<
+    //        errinfo_api_function("c_function") );
+    inline
+    std::string
+    to_string( errinfo_errno const & e )
+        {
+        std::ostringstream tmp;
+        int v=e.value();
+        tmp << v << ", \"" << strerror(v) << "\"";
+        return tmp.str();
+        }
+    }
+
+#endif