// Custom includes
#include <exception>
#include <string>
+#include <boost/preprocessor/repeat.hpp>
+#include <boost/preprocessor/cat.hpp>
//#include "Exception.mpp"
///////////////////////////////hh.p////////////////////////////////////////
/** \brief Exception handling standard UNIX errors (errno)
- This exception is thrown to signal generic errno failures.
+ This exception is thrown to signal generic \c errno failures. In addition to the \c errno
+ number (the code()), this class manages optional origin information. This parameter should
+ be provided to further describe, in what context the exception was created.
- \todo make where and err accessors and make the member vars private
+ This exception should not be used directly. Instead the derived class ErrnoException should
+ be thrown via one of the senf::throwErrno() helpers.
- \idea Add a template class derived from SystemException which
- takes the error number as a numeric argument. This allows
- catching specific errno conditions: ErrnoException<EPIPE> etc.
-
- \idea Add a generic error thrower which takes the origin
- string and errno value as an argument and will throw a
- corresponding template class instance. This would just be a
- big switch statement containing all possible errno values,
- probably created using some macro metaprogramming.
+ \see ErrnoException
*/
class SystemException : public std::exception
{
public:
- explicit SystemException(int err); ///< SystemException without error lokus info
- /**< \param[in] err error number (the errno value) */
- SystemException(char const * where, int err); ///< SystemException with error location info
+ SystemException(); ///< SystemException without error location infor
+ /**< The error code is taken from the current value of the
+ global \c errno variable */
+
+ explicit SystemException(int code); ///< SystemException without error location info
+ /**< \param[in] code error number (the \c errno value) */
+
+ explicit SystemException(char const * where); ///< SystemException with error location info
+ /**< The error code is taken from the current value of the
+ global \c errno variable
+ \param[in] where description of error origin */
+
+ SystemException(char const * where, int code); ///< SystemException with error location info
/**< \param[in] where description of error origin
- \param[in] err error number (the errno value) */
+ \param[in] code error number (the \c errno value) */
virtual char const * what() const throw(); ///< Return verbose error description
- char const * where; ///< Error origin
- int err; ///< Error number
+ char const * where() const; ///< Error origin
+ int code() const; ///< Error code (\c errno number)
+ char const * description() const; ///< Error description (strerror() value)
+
+ bool anyOf(int c0, int c1=0, int c2=0, int c3=0, int c4=0, int c5=0,
+ int c6=0, int c7=0, int c8=0, int c9=0);
+ ///< \c true, if code() is one of \a c0 ... \a c9
virtual ~SystemException() throw();
private:
void init();
+
+ char const * const where_;
+ int const code_; // This must be const to make the derived ErrnoException
+ // class a valid derived class.
std::string buffer_;
};
+ /** \brief Error specific system exception
+
+ This template restricts the generic SystemException to a specific, compile-time constant
+ error number \p Code. This allows a specific \c errno number to be cached explicitly.
+
+ This exception is normally thrown via one of the senf::throwErrno() helpers. These helpers
+ take the numeric \c errno value (either from the \c errno variable or from their
+ argument) and will throw the corresponding ErrnoException:
+ \code
+ if ((fd = ::open(filename, O_RDWR)) < 0)
+ senf::throwErrno("open()");
+ \endcode
+ */
+ template <int Code>
+ class ErrnoException : public SystemException
+ {
+ public:
+ static int const fixed_code = Code;
+
+ ErrnoException(); ///< ErrnoException without error location information
+ explicit ErrnoException(char const * where);
+ ///< ErrnoException with error location information
+ };
+
+
+ /** \brief Throw ErrnoException based on current \c errno value
+ \related ErrnoException
+ */
+ void throwErrno();
+
+ /** \brief Throw ErrnoException based on current \c errno value (with location info)
+ \related ErrnoException
+ */
+ void throwErrno(char const * where);
+
+ /** \brief Throw ErrnoException based on given \c errno value
+ \related ErrnoException
+ */
+ void throwErrno(int code);
+
+ /** \brief Throw ErrnoException based on given \c errno value (with location info)
+ \related ErrnoException
+ */
+ void throwErrno(char const * where, int code);
+
enum NoThrow_t { nothrow };
}
///////////////////////////////hh.e////////////////////////////////////////
#include "Exception.cci"
//#include "Exception.ct"
-//#include "Exception.cti"
+#include "Exception.cti"
#endif
\f
projects / senf.git / blobdiff