Module BatReturnSource

Local exceptions/labels/goto/return.

This module defines a mechanism akin to SML's exception generators or to a generalization of C's return, i.e. the ability to define local labels, which may be used for immediately terminating an expression and returning a value. By opposition to usual OCaml exceptions, this mechanism

• allows polymorphic return values
• makes accidental exception catching slightly harder (while a local exception can escape its scope, it cannot be caught again by accident from this module).

Example:

  let find_in_array a e =
    label (fun label ->
      for i = 0 to Array.length a - 1 do
        if Array.get a i = e then return label (Some i)
      done;
      None)

• author David Teller

@documents Return