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exception/example/cloning_1.cpp

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//Copyright (c) 2006-2008 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/enable_exception_cloning.hpp>
#include <boost/exception/info.hpp>
#include <stdio.h>
#include <errno.h>
typedef boost::error_info<struct tag_errno,int> errno_info;
class file_read_error: public boost::exception { };
void
file_read( FILE * f, void * buffer, size_t size )
{
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if( size!=fread(buffer,1,size,f) )
throw boost::enable_exception_cloning(file_read_error()) << errno_info(errno);
}