Constructor (object-oriented programming): Difference between revisions

Revision as of 15:59, 6 October 2018

Revision as of 23:12, 24 January 2019

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Hello there

=> #<ExampleClass:0x007fb3f4299118>

</source>

=== OCaml ===

In [[OCaml (programming language)|OCaml]], there is one constructor. Parameters are defined right after the class name. They can be used to initialize instance variables and are accessible throughout the class. An anonymous hidden method called <code>initializer</code> allows to evaluate an expression immediately after the object has been built.

<ref>[http://caml.inria.fr/pub/docs/manual-ocaml/index.html]</ref>

<source lang="ocaml">

class person first_name last_name =

object

val full_name = first_name ^ " " ^ last_name

initializer

print_endline("Hello there, I am " ^ full_name ^ ".")

method get_last_name = last_name

end;;

let alonzo = new person "Alonzo" "Church" in (*Hello there, I am Alonzo Church.*)

print_endline alonzo#get_last_name (*Church*)

</source>