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Class object.Throwable

The base class of all thrown objects.

All thrown objects must inherit from Throwable. Class Exception, which derives from this class, represents the category of thrown objects that are safe to catch and handle. In principle, one should not catch Throwable objects that are not derived from Exception, as they represent unrecoverable runtime errors. Certain runtime guarantees may fail to hold when these errors are thrown, making it unsafe to continue execution after catching them.

Inherits from

Fields

Name Type Description
file string The file name and line number of the D source code corresponding with where the error was thrown from.
info object.Throwable.TraceInfo The stack trace of where the error happened. This is an opaque object that can either be converted to string, or iterated over with foreach to extract the items in the stack trace (as strings).
line ulong The file name and line number of the D source code corresponding with where the error was thrown from.
msg string A message describing the error.
next Throwable A reference to the next error in the list. This is used when a new Throwable is thrown from inside a catch block. The originally caught Exception will be chained to the new Throwable via this field.

Methods

Name Description
toString Overrides Object.toString and returns the error message. Internally this forwards to the toString overload that takes a sink delegate.
toString The Throwable hierarchy uses a toString overload that takes a sink delegate to avoid GC allocations, which cannot be performed in certain error situations. Override this toString method to customize the error message.
factory Create instance of class specified by the fully qualified name classname. The class must either have no constructors or have a default constructor.
opCmp Compare with another Object obj.
opEquals Returns !=0 if this object does have the same contents as obj.
toHash Compute hash function for Object.

Authors

Walter Bright, Sean Kelly

License

Boost License 1.0.

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