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/*
Copyright © 2011, 2012 MLstate

This file is part of OPA.

OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.

OPA is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
more details.

You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*/


/**
* {1 Types defined in this module}
*/

/**
* The type of mutable element.
* @param 'a The type contained in the element.
* get returns the content of the mutable element.
* set changes the content of the mutable element.
*/
type Mutable.t('a) = {get: -> 'a; set: 'a -> void}

/**
* {1 About this module}
*
* It provides a way to have a mutable state.
*
* e.g.
*
* state = Mutable.create("initial state content")
* println(state.get())
* state.set("new state content")
*
*/
Mutable =
{{
   make(init:'a): Mutable.t('a) =
        r = Reference.create(init)
        {{
           get() = Reference.get(r)
           set(x)= Reference.set(r, x)
        }}

}}

@opacapi
Mutable_make = Mutable.make

@opacapi Mutable_set(mutable,v) : Mutable.t('a) = mutable.set(v)
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