Programmering i Ruby

Den Pragmatiske Programmerers Veiledning

Forrige < Innhold ^
Neste >
klassen Exception
Forelder: Object
Versjon: 1.6

Indeks:

exception backtrace exception message set_backtrace


Descendents of class Exception are used to communicate between raise methods and rescue statements in begin/end blocks. Exception objects carry information about the exception---its type (the exception's class name), an optional descriptive string, and optional traceback information.

klassemetoder
exception Exception.exception( [ aString ] ) -> anException

Creates and returns a new exception object, optionally setting the message to aString.

instansmetoder
backtrace exc.backtrace -> anArray

Returns any backtrace associated with the exception. The backtrace is an array of strings, each containing either ``filename:lineNo: in `method''' or ``filename:lineNo.''

def a
  raise "boom"
end

def b   a() end

begin   b() rescue => detail   print detail.backtrace.join("\n") end
produces:
prog.rb:2:in `a'
prog.rb:6:in `b'
prog.rb:10

exception exc.exception( [ aString ] ) -> anException or exc

With no argument, returns the receiver. Otherwise, creates a new exception object of the same class as the receiver, but with a different message.

message exc.message -> aString

Returns the message associated with this exception.

set_backtrace exc.set_backtrace( anArray ) -> anArray

Sets the backtrace information associated with exc. The argument must be an array of String objects in the format described in Exception#backtrace .


Forrige < Innhold ^
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Extracted from the book "Programming Ruby - The Pragmatic Programmer's Guide".
Translation to norwegian by Norway Ruby User Group.
Copyright for the english original authored by David Thomas and Andrew Hunt:
Copyright © 2001 Addison Wesley Longman, Inc.
This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at
http://www.opencontent.org/openpub/).

(Please note that the license for the original has changed from the above. The above is the license of the original version that was used as a foundation for the translation efforts.)

Copyright for the norwegian translation:
Copyright © 2002 Norway Ruby User Group.
This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at
http://www.opencontent.org/openpub/).
Distribution of substantively modified versions of this document is prohibited without the explicit permission of the copyright holder.
Distribution of the work or derivative of the work in any standard (paper) book form is prohibited unless prior permission is obtained from the copyright holder.