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.\" ========================================================================
.\"
.IX Title "UR::DeletedRef 3pm"
.TH UR::DeletedRef 3pm "2016-10-31" "perl v5.24.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
UR::DeletedRef \- Represents an instance of a no\-longer\-existent object
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  my $obj = Some::Class\->get(123);
\&  
\&  $obj\->delete;
\&  print ref($obj),"\en";  # prints \*(AqUR::DeletedRef\*(Aq
\&  $obj\->some_method();   # generates an exception through Carp::confess
\&
\&  $obj\->resurrect; 
\&  print ref($obj),"\en";  # prints \*(AqSome::Class\*(Aq
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Object instances become UR::DeletedRefs when some part of the application 
calls \fIdelete()\fR or \fIunload()\fR on them, meaning that they no longer exist
in that Context.  The extant object reference is turned into a UR::DeletedRef
so that if that same reference is used in any capacity later in the program,
it will generate an exception through its \s-1AUTOLOAD\s0 to prevent using it by
mistake.
.PP
Note that UR::DeletedRef instances are different than Ghost objects.  When a
UR-based object is deleted through \fIdelete()\fR, a new Ghost object reference is
created from the data in the old object, and the old object reference is
re-blessed as a UR::DeletedRef.  Any variables still referencing the original
object now hold a reference to this UR::DeletedRef.  The Ghost object can be
retrieved by issuing a \fIget()\fR against the Ghost class.
.PP
Objects unloaded from the Context using \fIunload()\fR, or indirectly by rolling-back
a transaction which triggers unload of objects loaded during the transaction,
are also turned into UR::DeletedRefs.
.PP
You aren't likely to encounter UR::DeletedRefs in normal use.  What usually
happens is that an object will be deleted with \fIdelete()\fR (or \fIunload()\fR), the
lexical variable pointing to the DeletedRef will soon go out of scope and
the DeletedRef will then be garbage-colelcted.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
UR::Object, UR::Object::Ghost, UR::Context