[swift-evolution] 100% bikeshed topic: DictionaryLiteral

Gwendal Roué gwendal.roue at gmail.com
Tue Jan 9 01:06:29 CST 2018

> Le 9 janv. 2018 à 06:40, Nevin Brackett-Rozinsky via swift-evolution <swift-evolution at swift.org> a écrit :
> The ulterior question of whether preserving “DictionaryLiteral” is worthwhile, is apparently out of scope. Personally, I have a hard time imagining a compelling use-case outside of the standard library, and I doubt it’s being used “in the wild” (I checked several projects in the source-compatibility suite and found zero occurrences).

DictionaryLiteral is worthwhile. The SQLite library GRDB uses DictionaryLiteral in order to build database rows (which may have duplicated column names, and whose column ordering is important). This is mostly useful for tests:

    let row = try Row.fetchOne(db, "SELECT 1 AS a, 2 AS a")!
    XCTAssertEqual(row, ["a": 1, "a": 2])

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