TIP #473: Allow a Defined Target Namespace in oo::copy

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TIP #473: Allow a Defined Target Namespace in oo::copy

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 Version:      $Revision: 1.1 $
 Author:       Donal Fellows <dkf_at_users.sf.net>
 State:        Draft
 Type:         Project
 Tcl-Version:  8.6.7
 Vote:         Pending
 Created:      Tuesday, 06 June 2017
 URL:          http://purl.org/tcl/tip/473.html
 WebEdit:      http://purl.org/tcl/tip/edit/473



 This TIP adds functionality to *oo::copy* to allow the created copy to
 have a defined namespace, much as *oo::class*'s *createWithNamespace*
 method allows such a namespace to be given on normal object creation.


 Due to an oversight, the *oo::copy* command is missing the ability to
 have an explicit namespace name specified to use as the instance
 namespace of the target object. It was always intended to have this
 (and the functionality is there in the C API), but it was omitted from
 the Tcl-level interface.

 Having this capability allows objects to be used as factories for
 namespaces, which is in many ways an inversion of the way that TclOO
 was designed (with namespaces as the basis for objects). It was
 requested by Nathan Coulter as a way to enable more complex behaviour
 in Rivet and NaviServer. See Tcl Issue dd3b844fda
 [<URL:http://core.tcl.tk/tcl/tktview/dd3b844fdabdeae5fcb0>] for more


 I propose to add one more optional argument to *oo::copy*,
 /targetNamespace/, that if provided and non-empty will be the name of a
 namespace (resolved relative to the current namespace if not an
 absolute name) that will be the name of the newly created target
 object's instance namespace. The named namespace must not already
 exist. Note that specifying the /targetObject/ as the empty string will
 cause the object's command to be automatically chosen.

       *oo::copy* /sourceObject/ ?/targetObject/? ?/targetNamespace/?

 The meaning of the result of the command is unchanged.


 See the oo-copy-ns branch.


 This document has been placed in the public domain.


 TIP AutoGenerator - written by Donal K. Fellows

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