Scheme Request for Implementation 179,
"Nonempty Intervals and Generalized Arrays (Updated),"
by Bradley J. Lucier,
has gone into FINAL status.

The document and an archive of the discussion are available at <https://srfi.schemers.org/srfi-179/>.

Here's the abstract:

This SRFI specifies an array mechanism for Scheme. Arrays as defined
here are quite general; at their most basic, an array is simply a
mapping, or function, from multi-indices of exact integers
i₀, …, i_(d − 1) to Scheme values. The set of multi-indices
i₀, …, i_(d − 1) that are valid for a given array form the domain of
the array. In this SRFI, each array's domain consists of the cross
product of nonempty intervals of exact integers
[l₀, u₀) × [l₁, u₁) × ⋯ × [l_(d − 1), u_(d − 1)) of ℤ^(d), d-tuples of
integers. Thus, we introduce a data type called d-intervals, or more
briefly intervals, that encapsulates this notion. (We borrow this
terminology from, e.g., Elias Zakon's Basic Concepts of Mathematics.)
Specialized variants of arrays are specified to provide portable
programs with efficient representations for common use cases.

Here is the commit summary since the most recent draft:

- Add copy-on-failure? to specialized-array-reshape
- Announce Draft #10.
- Fix all errors reported by W3C HTML Validator.
- Convert to HTML 5.
- Add first R7RS module support
- Draft #11
- Remove trailing whitespace.
- Fix spelling.
- Fix capitalization, punctuation, and the like.
- Switch to new standard SRFI header.
- Fix link to match.
- Finalize.

Here are the diffs since the most recent draft:

<https://github.com/scheme-requests-for-implementation/srfi-179/compare/draft-11..final>

Many thanks to Bradley and to everyone who contributed to the discussion
of this SRFI.

Regards,



SRFI Editor

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