spir <[email protected]> wrote:
Hello,
The reference states:
ThrowStatement:
throw Expression ;
Expression is evaluated and must be an Object reference. The Object
reference is thrown as an exception.
throw new Exception("message");
The example uses an Excpetion type, but the somewhat comment contradicts
it. Can one really use any kind of object as exception?
Absolutely. It is however heavily discouraged.
How does D then handle it?
The way it does any other exception. You may catch it using
catch(Object o).
I was expecting (from exp with other language) there to be a root Error
or Exception type implementating base exception mechanics and/or an
imposed interface to comply with (esp a kind of string method returning
what text to write out when the exception is not caught).
How does this work, and how to use it concretely?
There is a base class Exception and Error, as well as the base interface
Throwable, which the aforementioned implement. Using this is more of a
convention than absolute necessity, but it is used all over Phobos and
druntime, and it is heavily discouraged not to use those as bases.
On a sidenote, one should usually only catch Exceptions, not Errors, as
the latter is supposed to be used for non-recoverable errors.
--
Simen
