// however all other solutions to format the message are terribly
// ugly (since thay must use a static and shared buffer ...)
std::stringstream s;
- if (where)
- s << where << ": ";
- s << "(" << err << ") " << std::strerror(err);
+ if (where_)
+ s << where_ << ": ";
+ s << "(" << code_ << ") " << description();
buffer_ = s.str();
}
-prefix_ char const * senf::SystemException::what()
- const throw()
+prefix_ void senf::throwErrno(char const * where, int code)
{
- return buffer_.c_str();
+ switch (code) {
+
+ // BOOST_PP_REPEAT is limited to 256 repetitions. The max errno value I found in any header file
+ // was somewhere around 530 or so. I assume going to 1024 will be good enough. This explicit
+ // code will be optimized into a jump table by g++ (which is more efficient than trying to do
+ // the table oneself)
+
+# define ExceptionCase(z, n, data) case n: throw ErrnoException<n>(where);
+ BOOST_PP_REPEAT(256, ExceptionCase, _) ;
+# undef ExceptionCase
+
+# define ExceptionCase(z, n, data) case 256+n: throw ErrnoException<256+n>(where);
+ BOOST_PP_REPEAT(256, ExceptionCase, _) ;
+# undef ExceptionCase
+
+# define ExceptionCase(z, n, data) case 512+n: throw ErrnoException<512+n>(where);
+ BOOST_PP_REPEAT(256, ExceptionCase, _) ;
+# undef ExceptionCase
+
+# define ExceptionCase(z, n, data) case 768+n: throw ErrnoException<768+n>(where);
+ BOOST_PP_REPEAT(256, ExceptionCase, _) ;
+# undef ExceptionCase
+
+ default:
+ throw SystemException(where, code);
+ }
}
///////////////////////////////cc.e////////////////////////////////////////