early-access version 3088

externals/vcpkg/buildtrees/boost-exception/src/ost-1.79.0-1b4bdfb5ca.clean/example/cloning_1.cpp

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+//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 to enable cloning when throwing a boost::exception.
+
+#include <boost/exception/info.hpp>
+#include <boost/exception/errinfo_errno.hpp>
+#include <stdio.h>
+#include <errno.h>
+
+struct file_read_error: virtual boost::exception { };
+
+void
+file_read( FILE * f, void * buffer, size_t size )
+    {
+    if( size!=fread(buffer,1,size,f) )
+        throw boost::enable_current_exception(file_read_error()) <<
+            boost::errinfo_errno(errno);
+    }