...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
#include <boost/exception/errinfo_at_line.hpp>
#include <boost/exception/error_info.hpp> namespace boost { typedef error_info<struct errinfo_at_line_,int> errinfo_at_line; }
This type is designed to be used as a standard error_info instance for transporting a relevant text file line number, for example in parse error exceptions deriving from 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; }