ReadOnly Field or Property

[paulmansour]

Often I want a readonly public field that is set once and only once in the constructor. It seems the only to accomplish this is to make it propery, and define a getter function which simply returns the underlying private property. Is this correct? Any other way to do it? This takes a lot of boiler plate code. It seems that the constructor should allow the setting of read-only fields.

[StefanoLanzavecchia]

Another way would be to allow (like in Ruby) the execution of code, let's say when the script is fixed, to build automatically those properties.

[paulmansour]

Stefano, isn't that what happens now in a class in dyalog? It gets executed when fixed. The problem (for me) is that I want a read-only field instantiated when the instance is created, not when the class is created or fixed.

[StefanoLanzavecchia]

What I was suggesting was a way to obtain executing code the structure you proposed (i.e.: a property without the setter). The ":Property" in the script prevents this from happening and []FX'ing a function that ":implements" the property getter doesn't seem to work.

[JohnD|Dyalog]

Another way would be to allow (like in Ruby) the execution of code, let's say when the script is fixed, to build automatically those properties.

And I believe (memory's not what it was, and I'm too busy to check), that you can assign to a readonly field at class fix time.

[paulmansour]

John, I hope so, otherwise how would a readonly field every get a value? ;)