[REBOL] Re: adding set-words to a context from outside
Hi Anton, try Once upon a time Anton Rolls spoketh thus: Does anyone know how to add words to an object from outside that object? For example, take an empty object o: o: context [] ; Now some voodoo stuff happens ; here that adds a word to o o: make o [a: none] ; and the result... probe o make object! [ a: none ] But remember, that 'make doesn't create deep copies, so you might run into some surprises, if you tried to assign this to another word. But setting it back to the same is safe. kind regards, Ingo -- To unsubscribe from this list, please send an email to [EMAIL PROTECTED] with unsubscribe in the subject, without the quotes.
[REBOL] Re: adding set-words to a context from outside
Hi, sorry for butting in... but if you do: obj_a: make object! [ attrib1: 1 ] obj_ptr: obj_a obj_b: make obj_a [ attrib2: 2 ] Am I right in saying that obj_ptr still references obj_a which only has one element? so is there a way to grow an object? cause in some circustances, you cannot replace all references to an object (especially when code is dynamic and there is no way to know how many references exist). -Max -- Maxim Olivier-Adlhoch -- - Original Message - From: Ingo Hohmann [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, October 12, 2001 5:06 AM Subject: [REBOL] Re: adding set-words to a context from outside Hi Anton, try Once upon a time Anton Rolls spoketh thus: Does anyone know how to add words to an object from outside that object? For example, take an empty object o: o: context [] ; Now some voodoo stuff happens ; here that adds a word to o o: make o [a: none] ; and the result... probe o make object! [ a: none ] But remember, that 'make doesn't create deep copies, so you might run into some surprises, if you tried to assign this to another word. But setting it back to the same is safe. kind regards, Ingo -- To unsubscribe from this list, please send an email to [EMAIL PROTECTED] with unsubscribe in the subject, without the quotes. -- To unsubscribe from this list, please send an email to [EMAIL PROTECTED] with unsubscribe in the subject, without the quotes.
[REBOL] Re: adding set-words to a context from outside
Hi, Max sorry for butting in... but if you do: obj_a: make object! [ attrib1: 1 ] obj_ptr: obj_a obj_b: make obj_a [ attrib2: 2 ] Am I right in saying that obj_ptr still references obj_a which only has one element? so is there a way to grow an object? cause in some circustances, you cannot replace all references to an object (especially when code is dynamic and there is no way to know how many references exist). no, but you can use a method to emulate the growth, here it is: obj_a: make object! [ attrib1: 1 ] obj_ptr: obj_a obj_b: make obj_a [ attrib2: 2 ] obj_a/self: obj_b ;- To transparent access the grown object, you must always refer the fields of obj_a with 'self: probe obj_a/self/attrib1 probe obj_a/self/attrib2 The drawback is that obj_a always remains in memory. Another method is to put all the objects to grown in a block and refers to them always with the block name: bl: reduce [ make object! [ attrib1: 1 ] ] obj_a: does [bl/1] get in obj_a 'attrib1 bl/1: make bl/1 [attrib2: 2 ] get in obj_a 'attrib2 You can make it with another object: oo: context [o1: context [a: 1]] oo/o1/a == 1 oo/o1: make oo/o1 [b: 2] oo/o1/a == 1 oo/o1/b == 2 You must never resolve the pointer to o1. -Max --- Ciao Romano -- To unsubscribe from this list, please send an email to [EMAIL PROTECTED] with unsubscribe in the subject, without the quotes.
