[Pitch #2] Function builders

ktoso · November 28, 2020, 7:52am

You may have ended up reading outdated documents @Anachron.

This is the "pitch thread", while the feature now known as "result builders" has already been accepted (after revisions): SE-0289 (review #2): Result Builders - #141 by compnerd so refer to that thread what the status quo is.

What you are mentioning with buildDeclaration sounds to me exactly like the feature I mentioned early on when working on some internal DSLs, and it's right now in the "future directions" section:

github.com

apple/swift-evolution/blob/main/proposals/0289-result-builders.md#transforming-declarations

# Result builders

* Proposal: [SE-0289](0289-result-builders.md)
* Authors: [John McCall](https://github.com/rjmccall), [Doug Gregor](https://github.com/DougGregor)
* Review Manager: [Saleem Abdulrasool](https://github.com/compnerd)
* Status: **Implemented (Swift 5.4)**
* Previous Revisions: [1st](https://github.com/apple/swift-evolution/blob/51c99447562e749b23f82184c99c0ddfb07a71df/proposals/0289-function-builders.md)

Table of Contents
=================
   * [Result builders](#result-builders)
      * [Changes from the first revision](#changes-from-the-first-revision)
      * [Introduction](#introduction)
      * [Motivation](#motivation)
      * [Detailed design](#detailed-design)
         * [Result builder types](#result-builder-types)
         * [Result builder attributes](#result-builder-attributes)
         * [Result-building methods](#result-building-methods)
         * [The result builder transform](#the-result-builder-transform)
            * [Statement blocks](#statement-blocks)

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The full motivation post is here: Function builders and "including" let declarations in built result