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Re: [Cbor] CDDL Module Design

Michael Richardson <mcr@sandelman.ca> Wed, 01 July 2020 21:40 UTC

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From: Michael Richardson <mcr@sandelman.ca>
To: Carsten Bormann <cabo@tzi.org>, cbor@ietf.org, Jim Schaad <ietf@augustcellars.com>
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Date: Wed, 01 Jul 2020 17:40:39 -0400
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Subject: Re: [Cbor] CDDL Module Design
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Michael Richardson <mcr+ietf@sandelman.ca> wrote:
    >> On 2020-07-01, at 05:54, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
    >>>
    >>> I prefer that the statement not be a pre-processor-like hack.

    >> The C/C++ preprocessor may be considered a hack because it operates at
    >> a lexical level.  We should not make that mistake.  Apart from that, it
    >> does useful things.

    >> Or, in other words, your hack may be my perfect layering.

    > I agree.
    > As has been pointed out in
    > https://www.goodreads.com/book/show/44919.Working_Effectively_with_Legacy_Code

    > the preprocessor is a really good tool for inserting shims.

The word I wanted was "seams", not shims.
C gives you pre-processor seams, and link seams.
Java lets you have neither.

A seam is a way to replace some function, usually something low-level like
"open(2)" or "socket(2)" so that in a unit test you can feed in test data
rather than live data.

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