Dyalog Forums

Posted: **Sun Oct 25, 2020 12:32 pm**

I want to have some factory methods.

A parameter of a shared method with the name of a instance property masks this property if it creates an instance.

In the sample code an instance created by #createWrong has a public field #name insted of a property.

Code: Select all

:Class Text
    ∇ p←createOk name_
      :Access Public Shared
      p←#.⎕NEW ⎕THIS name_
    ∇
    ∇ p←createWrong name
      :Access Public Sharedhave som [i][i][/i][/i]
      p←#.⎕NEW ⎕THIS name
    ∇
    :Field Private m_name←'unnown'
    :Property name
    :Access Public
        ∇ r←get
          r←m_name
        ∇
    :EndProperty
    
    ∇ make1 name  
      :Implements Constructor
      :Access Public
      m_name←⌽name
    ∇
    ∇ r←show;∆ok
      :Access Public
      ∆ok←{≡/⍵:⍵,⊂'okay' ⋄ ⍵,⊂'wrong'}
      r←(⊂'#name:'),∆ok m_name name
    ∇
:EndClass

In the sample ccde has an instance created by #createWrong a public field with the name

Code: Select all

      (#.ok←Text.createOk'reteP').show
 #name:  Peter  Peter  okay 
      (#.wrong←Text.createWrong'luaP').show
 #name:  Paul  luaP  wrong 
      #.wrong.⎕NL¯2.1
 name

Posted: **Mon Oct 26, 2020 10:30 am**

I think this is just how it is and that you will need to use different names.

Code: Select all

:Class C
    :field public name
    ∇ Init name
      :Access public
      :Implements constructor
      name←name
    ∇
:EndClass

Code: Select all

      c←⎕NEW C 'John'
      c.name
VALUE ERROR
      c.name
            ∧

Compared to:

Code: Select all

:Class C
    :field public name
    ∇ Init arg
      :Access public
      :Implements constructor
      name←arg
    ∇
:EndClass

Code: Select all

      c←⎕NEW C 'John'
      c.name
John

Posted: **Wed Oct 28, 2020 6:33 am**

Surely this must be a bug? I understand that the name is shadowed while createWrong is on the stack, but it seems that the instance created with createWrong has managed to change the property name into a variable type. Setters and getters are no longer triggered at all?!

      (#.ok←Text.createOk'reteP').show
 #name:  Peter  Peter  okay 
      ok.⎕NC⊂'name'
¯2.3
      (#.wrong←Text.createWrong 'reteP').show
 #name:  Peter  reteP  wrong 
      wrong.⎕NC⊂'name'
¯2.1

Dyalog Forums

masking public property?

masking public property?

Re: masking public property?

Re: masking public property?