Exception handling

Files
file	exceptions.hh
	A few common exception classes.

Classes
class	Dune::Exception
	Base class for Dune-Exceptions. More...
struct	Dune::ExceptionHook
	Base class to add a hook to the Dune::Exception. More...
class	Dune::IOError
	Default exception class for I/O errors. More...
class	Dune::MathError
	Default exception class for mathematical errors. More...
class	Dune::RangeError
	Default exception class for range errors. More...
class	Dune::NotImplemented
	Default exception for dummy implementations. More...
class	Dune::SystemError
	Default exception class for OS errors. More...
class	Dune::OutOfMemoryError
	Default exception if memory allocation fails. More...
class	Dune::InvalidStateException
	Default exception if a function was called while the object is not in a valid state for that function. More...
class	Dune::ParallelError
	Default exception if an error in the parallel communication of the programm occurred. More...

Macros
#define	DUNE_THROW(E, m)

Functions
void	Dune::Exception::message (const std::string &msg)
	store string in internal message buffer
virtual const char *	Dune::Exception::what () const noexcept
	output internal message buffer
static void	Dune::Exception::registerHook (ExceptionHook *hook)
	add a functor which is called before a Dune::Exception is emitted (see Dune::ExceptionHook) More...
static void	Dune::Exception::clearHook ()
	remove all hooks

Detailed Description

The Dune-exceptions are designed to allow a simple derivation of subclasses and to accept a text written in the '<<' syntax.

Example of usage:

#include <dune/common/exceptions.hh>
 
...
 
class FileNotFoundError : public Dune::IOError {};
 
...
 
void fileopen (std::string name) {
std::ifstream file;
 
file.open(name.c_str());
 
if (file == 0)
 DUNE_THROW(FileNotFoundError, "File " << name << " not found!");
 
...
 
file.close();
}
 
...
 
int main () {
try {
 ...
} catch (Dune::IOError &e) {
 std::cerr << "I/O error: " << e << std::endl;
 return 1;
} catch (Dune::Exception &e) {
 std::cerr << "Generic Dune error: " << e << std::endl;
 return 2;
}
}

See also

exceptions.hh for detailed info

Macro Definition Documentation

DUNE_THROW

#define DUNE_THROW	(		E,
			m
	)

Value:

                              do { E th__ex; std::ostringstream th__out; \
                              th__out << THROWSPEC(E) << m; th__ex.message(th__out.str()); throw th__ex; \
} while (0)

Macro to throw an exception

#include <dune/common/exceptions.hh>

Parameters

E	exception class derived from Dune::Exception
m	reason for this exception in ostream-notation

Example:

if (filehandle == 0)
 DUNE_THROW(FileError, "Could not open " << filename << " for reading!");

DUNE_THROW automatically adds information about the exception thrown to the text.

Note

you can add a hook to be called before a Dune::Exception is emitted, e.g. to add additional information to the exception, or to invoke a debugger during parallel debugging. (see Dune::ExceptionHook)

Function Documentation

registerHook()

void Dune::Exception::registerHook ( ExceptionHook *  hook )

static

add a functor which is called before a Dune::Exception is emitted (see Dune::ExceptionHook)

See also

Dune::ExceptionHook