Re: New syntax: (: MODULE-NAME VARIABLE-NAME)

[Marius Vollmer <mvo@zagadka.de>]

Neil Jerram <neil@ossau.uklinux.net> writes:

> OK.  One other specification query: will `:' only work if the relevant
> binding is exported?

Yes, I think that's more disciplined.  Here is the actual code:

    ;; The following macro allows one to write, for example,
    ;;
    ;;    (: (ice-9 pretty-print) pretty-print)
    ;;
    ;; to refer directly to the pretty-print variable in module (ice-9
    ;; pretty-print).  It works by looking up the variable and inserting
    ;; it directly into the code.  This is understood by the evaluator.
    ;; Indeed, all references to global variables are memoized into such
    ;; variable objects.

    (define-macro (: mod-name var-name)
      (let ((var (module-variable (resolve-interface mod-name) var-name)))
        (if (not var)
            (error "no such public variable" (list ': mod-name var-name)))
        var))


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