package batteries

  1. Overview
  2. Docs
A community-maintained standard library extension

Install 

dune-project
 Dependency

github.com Edit opam file Versions (15)

Authors

  1. O
    OCaml batteries-included team

Maintainers

  1. C
    Cedric Cellier <rixed@happyleptic.org>
  2. F
    Francois Berenger <unixjunkie@sdf.org>
  3. Gabriel Scherer
  4. T
    Thibault Suzanne <thi.suzanne@gmail.com>

Sources

v3.3.0.tar.gz
sha256=40d18485911e343500a5636bbf1d84e2ee32f924fe87e5fd13a37641a4d8f226
md5=fe4da12b678a82faaeda4e58492ea871

doc/batteries.unthreaded/BatGlobal/index.html

Module BatGlobal

Mutable global variable.

Often in OCaml you want to have a global variable, which is mutable and uninitialized when declared. You can use a 'a option ref but this is not very convenient. The Global module provides functions to easily create and manipulate such variables.

  • author Nicolas Cannasse
  • author David Teller (boilerplate code)
type 'a t

Abstract type of a global

exception Global_not_initialized of string

Raised when a global variable is accessed without first having been assigned a value. The parameter contains the name of the global.

val empty : string -> 'a t

Returns an new named empty global. The name of the global can be any string. It identifies the global and makes debugging easier. Using the same string twice will not return the same global twice, but will create two globals with the same name.

val name : 'a t -> string

Retrieve the name of a global.

val set : 'a t -> 'a -> unit

Set the global value contents.

val get_exn : 'a t -> 'a

Get the global value contents - raise Global_not_initialized if not defined.

val get : 'a t -> 'a option

Return None if the global is undefined, else Some v where v is the current global value contents.

val undef : 'a t -> unit

Reset the global value contents to undefined.

val isdef : 'a t -> bool

Return true if the global value has been set.