[m-rev.] Add `:- mutable' declaration to the language.

[Ian MacLarty]

On Thu, 1 Sep 2005, Ralph Becket wrote:

> Estimated hours taken: 24
> Branches: main
>
> Add `:- mutable' directives to the language, providing modules with private
> mutable variables.  A directives
>
> :- mutable(x, int, 0, ground, [thread_safe]).
>
> leads to the compiler generating the following:
>
> :- semipure pred get_x(int::out(ground)) is det.
> :- impure   pred set_x(int::in(ground)) is det.
> :-          pred initialise_mutable_x(io::di, io::uo) is det.

Can we have pure versions of get_x and set_x which take the I/O state?

Ian.

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