1 files changed, 31 insertions, 0 deletions
diff --git a/src/boost/libs/exception/example/info_tuple.cpp b/src/boost/libs/exception/example/info_tuple.cpp
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+++ b/src/boost/libs/exception/example/info_tuple.cpp
@@ -0,0 +1,31 @@
+//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)
+
+//This example shows how boost::tuple can be used to bundle the
+//name of the function that fails together with the reported errno.
+
+#include <boost/exception/info_tuple.hpp>
+#include <boost/exception/errinfo_file_name.hpp>
+#include <boost/exception/errinfo_api_function.hpp>
+#include <boost/exception/errinfo_errno.hpp>
+#include <boost/shared_ptr.hpp>
+#include <stdio.h>
+#include <string>
+#include <errno.h>
+
+typedef boost::tuple<boost::errinfo_api_function,boost::errinfo_errno> clib_failure;
+
+struct file_open_error: virtual boost::exception { };
+
+boost::shared_ptr<FILE>
+file_open( char const * name, char const * mode )
+    {
+    if( FILE * f=fopen(name,mode) )
+        return boost::shared_ptr<FILE>(f,fclose);
+    else
+        throw file_open_error() <<
+            boost::errinfo_file_name(name) <<
+            clib_failure("fopen",errno);
+    }