Re: [Pharo-users] How do Smalltalk disambiguate messages?

Oct. 16, 2016


      Oops, that should be..

    | array lookupClosure performClosure |
    lookupClosure := [].
    lookupClosure := [:cls :selector |
         (cls == nil)
             ifTrue: [Warning signal: ('method lookup failure: ',
    selector)].
         cls methodDictionary
             at: selector
             ifPresent: [:meth | meth]
             ifAbsent: [lookupClosure value: cls superclass value:
    selector]].
    performClosure := [ :receiver :selector :args |
         (lookupClosure value: receiver class value: selector)
             valueWithReceiver: receiver arguments: args ].
    array := { 1 }.
    performClosure value: array value: #at:put: value: {1. 'Hello, world'}.
    array inspect.


On 10/16/2016 10:03 AM, Charlie Robbats wrote:
...
and a little block cleanup:
| array lookupClosure performClosure |
    lookupClosure := [].
    lookupClosure := [:cls :selector |
        (cls == nil)
            ifTrue: [Warning signal: ('method lookup failure: ',
    selector)].
        cls methodDictionary
            at: selector
            ifPresent: [:meth | meth]
            ifAbsent: [lookupClosure value: cls superclass value:
    selector]].
    performClosure := [ :receiver :args |
        (lookupClosure value: array class value: #at:put:)
            valueWithReceiver: array arguments: args ].
    array := { 1 }.
    performClosure value: array value: {1. 'Hello, world'}.
    array inspect.
Charlie
On 10/16/2016 9:54 AM, Charlie Robbats wrote:
...
Here's a little change to get your #perform:withArguments: implemented.
| array lookupClosure method |
array := { 1 }.
lookupClosure := [].
lookupClosure := [:cls :selector |
    (cls == nil)
        ifTrue: [Warning signal: ('method lookup failure: ', selector)].
    cls methodDictionary
        at: selector
"        ifPresent: [:meth | Smalltalk tools browser openOnMethod: 
meth]"
        ifPresent: [:meth | meth]
        ifAbsent: [lookupClosure value: cls superclass value: 
selector]].
method := lookupClosure value: Array value: #at:put:.
method valueWithReceiver: array arguments: {1. 'Hello, world'}.
array
On 10/16/2016 9:32 AM, Ben Coman wrote:
...
On Sun, Oct 16, 2016 at 9:11 PM, Charlie Robbats
<charlie.robbats@gmail.com> wrote:
...
Here, Dmitry, try this code in playground...maybe helps you understand
| lookupClosure |
lookupClosure := [].
lookupClosure := [:cls :selector |
     (cls == nil)
         ifTrue: [Warning signal: ('selector lookup failure: ', 
selector)].
     (cls methodDictionary
         at: selector
         ifAbsent: [nil])
             ifNil: [lookupClosure value: cls superclass value: 
selector]
             ifNotNil: [:meth | Smalltalk tools browser 
openOnMethod: meth]].
lookupClosure value: Array value: #at:put:.
Nice example.  Slightly improved...
| lookupClosure |
lookupClosure := [].
lookupClosure := [:cls :selector |
     (cls == nil)
         ifTrue: [Warning signal: ('selector lookup failure: ', 
selector)].
     cls methodDictionary
         at: selector
         ifPresent: [:meth | Smalltalk tools browser openOnMethod: 
meth]
         ifAbsent: [lookupClosure value: cls superclass value: 
selector]].
lookupClosure value: Array value: #at:put:.
cheers -ben