| //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 demonstrates the intended use of various commonly used |
| //error_info typedefs provided by Boost Exception. |
| |
| #include <boost/exception/errinfo_api_function.hpp> |
| #include <boost/exception/errinfo_at_line.hpp> |
| #include <boost/exception/errinfo_errno.hpp> |
| #include <boost/exception/errinfo_file_handle.hpp> |
| #include <boost/exception/errinfo_file_name.hpp> |
| #include <boost/exception/errinfo_file_open_mode.hpp> |
| #include <boost/exception/info.hpp> |
| #include <boost/throw_exception.hpp> |
| #include <boost/shared_ptr.hpp> |
| #include <boost/weak_ptr.hpp> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <exception> |
| |
| struct error : virtual std::exception, virtual boost::exception { }; |
| struct file_error : virtual error { }; |
| struct file_open_error: virtual file_error { }; |
| struct file_read_error: virtual file_error { }; |
| |
| boost::shared_ptr<FILE> |
| open_file( char const * file, char const * mode ) |
| { |
| if( FILE * f=fopen(file,mode) ) |
| return boost::shared_ptr<FILE>(f,fclose); |
| else |
| BOOST_THROW_EXCEPTION( |
| file_open_error() << |
| boost::errinfo_api_function("fopen") << |
| boost::errinfo_errno(errno) << |
| boost::errinfo_file_name(file) << |
| boost::errinfo_file_open_mode(mode) ); |
| } |
| |
| size_t |
| read_file( boost::shared_ptr<FILE> const & f, void * buf, size_t size ) |
| { |
| size_t nr=fread(buf,1,size,f.get()); |
| if( ferror(f.get()) ) |
| BOOST_THROW_EXCEPTION( |
| file_read_error() << |
| boost::errinfo_api_function("fread") << |
| boost::errinfo_errno(errno) << |
| boost::errinfo_file_handle(f) ); |
| return nr; |
| } |
