<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">I like the namespace-based approach to group these protocols together and I'm very happy to see some clarification happening in this group of protocols. However, I don't think the proposed new names communicate what they need to. The names listed in the "Alternatives Considered" section do a better job of describing the use and behavior of these protocols.</div><div class=""><br class=""></div><div class="">Primarily, the new names read like we're saying that a conforming type <i class="">is a</i> <i class="">literal</i>, compounding a common existing confusion between literals and types that can be initialized with a literal. Swift's type inference can sometimes make it seem like dark magic is afoot with literal conversions—for example, you need to understand an awful lot about the standard library to figure out why line 1 works here but not line 2:</div><div class=""><br class=""></div><div class=""><font face="Menlo" class=""> var x = [1, 2, 3, 4, 5]</font></div><div class=""><font face="Menlo" class=""> let y = [10, 20]</font></div><div class=""><font face="Menlo" class=""><br class=""></font></div><div class=""><font face="Menlo" class=""> x[1..<2] = [10, 20] // 1</font></div><div class=""><span style="font-family: Menlo;" class=""> x[1..<2] = y // 2</span></div><div class=""><br class=""></div><div class="">These new names are a (small) step in the wrong direction. While it's true that the type system doesn't have an <font face="Menlo" class="">IntegerLiteral</font> type, the language does have integer literals. If someone reads:</div><div class=""><br class=""></div><div class=""><font face="Menlo" class=""> extension MyInt : Syntax.IntegerLiteral { ... }</font></div><div class=""><br class=""></div><div class="">the implication is that <span style="font-family: Menlo;" class="">MyInt</span> is an integer literal, and therefore instances of <font face="Menlo" class="">MyInt</font> should be usable wherever an integer literal is usable. The existing "Convertible" wording may be a red herring, but it at least suggests that there's a difference between a literal and a concrete type.</div><div class=""><br class=""></div><div class="">In sum, I support a change like this and strongly recommend keeping some sort of adjective in the protocol name.</div><div class=""><br class=""></div><div class="">Nate</div><div class=""><br class=""></div><br class=""><div><blockquote type="cite" class=""><div class="">On Jun 23, 2016, at 10:31 AM, Matthew Johnson via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I have completed a draft of a proposal to move the `*LiteralConvertible` protocols into a `Syntax` namespace as suggested by the standard library team. <div class=""><br class=""></div><div class="">The draft can be found here: <a href="https://gist.github.com/anandabits/99dad2305d310874bd613b72b14eee56" class="">https://gist.github.com/anandabits/99dad2305d310874bd613b72b14eee56</a>. It is also included below.</div><div class=""><br class=""></div><div class="">I will submit a PR in the next day or two after incorporating any feedback.</div><div class=""><br class=""></div><div class="">-Matthew</div><div class=""><br class=""></div><div class=""><h1 id="literalsyntaxprotocols" style="font-size: 37px; line-height: 42px; margin-top: 42px; margin-bottom: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Literal Syntax Protocols</h1><ul style="margin-top: 21px; margin-bottom: 21px; padding-left: 1.5em; color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; font-size: 15px;" class=""><li style="font-size: 17px;" class="">Proposal: <a href="file:///Users/Matthew/Library/Containers/com.brettterpstra.marked2/Data/Library/Caches/Marked%202/Watchers/NNNN-literal-syntax-protocols.md" style="color: rgb(13, 110, 161); text-decoration: none; transition: color 0.2s ease-in-out; -webkit-transition: color 0.2s ease-in-out;" class="">SE-NNNN</a></li><li style="font-size: 17px;" class="">Author: <a href="https://github.com/anandabits" style="color: rgb(13, 110, 161); text-decoration: none; transition: color 0.2s ease-in-out; -webkit-transition: color 0.2s ease-in-out;" class="">Matthew Johnson</a></li><li style="font-size: 17px;" class="">Status: <strong style="line-height: 1;" class="">Awaiting review</strong></li><li style="font-size: 17px;" class="">Review manager: TBD</li></ul><h2 id="introduction" style="color: rgb(17, 17, 17); font-size: 27px; line-height: 42px; margin-top: 42px; margin-bottom: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Introduction</h2><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">This proposal renames the <code style="line-height: 1;" class="">*LiteralConvertible</code> protocols to <code style="line-height: 1;" class="">Syntax.*Literal</code>. </p><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">Swift-evolution thread: <a href="http://thread.gmane.org/gmane.comp.lang.swift.evolution/21290" style="color: rgb(13, 110, 161); text-decoration: none; transition: color 0.2s ease-in-out; -webkit-transition: color 0.2s ease-in-out;" class="">Revisiting SE–0041 Names</a></p><h2 id="motivation" style="color: rgb(17, 17, 17); font-size: 27px; line-height: 42px; margin-top: 42px; margin-bottom: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Motivation</h2><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">The standard library currently has protocols that use the term <code style="line-height: 1;" class="">Convertible</code> in two different ways. The <code style="line-height: 1;" class="">*LiteralConvertible</code> protocols use the meaning of converting <em style="line-height: 1;" class="">from</em> a literal. The <code style="line-height: 1;" class="">Custom(Debug)StringConvertible</code> protocols use the meaning of converting <em style="line-height: 1;" class="">to</em> a <code style="line-height: 1;" class="">String</code>. This causes confusion for developers attempting to name their own protocols following the precedence established by the standard library.</p><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">Further, the standard library team has observed:</p><pre style="margin-top: 21px; margin-bottom: 21px; tab-size: 4; color: rgb(17, 17, 17); font-size: 15px;" class=""><code class="applescript hljs" style="line-height: inherit; display: block; padding: 0.5em; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248); height: auto; background-position: initial initial; background-repeat: initial initial;">The <span class="hljs-string" style="color: rgb(221, 17, 68);">"literal"</span> protocols are <span class="hljs-keyword" style="font-weight: bold;">not</span> <span class="hljs-keyword" style="font-weight: bold;">about</span> conversion, they are <span class="hljs-keyword" style="font-weight: bold;">about</span> adopting a certain syntax provided <span class="hljs-keyword" style="font-weight: bold;">by</span> <span class="hljs-keyword" style="font-weight: bold;">the</span> language. <span class="hljs-string" style="color: rgb(221, 17, 68);">"Convertible"</span> <span class="hljs-keyword" style="font-weight: bold;">in</span> <span class="hljs-keyword" style="font-weight: bold;">the</span> <span class="hljs-property">name</span> <span class="hljs-keyword" style="font-weight: bold;">is</span> a red herring: a type can't be convertible <span class="hljs-keyword" style="font-weight: bold;">from</span> an <span class="hljs-type">integer</span> literal because there <span class="hljs-keyword" style="font-weight: bold;">is</span> no <span class="hljs-string" style="color: rgb(221, 17, 68);">"IntegerLiteral"</span> entity <span class="hljs-keyword" style="font-weight: bold;">in</span> <span class="hljs-keyword" style="font-weight: bold;">the</span> type system. The literal *becomes* typed <span class="hljs-keyword" style="font-weight: bold;">as</span> <span class="hljs-keyword" style="font-weight: bold;">the</span> corresponding literal type (e.g., Int <span class="hljs-keyword" style="font-weight: bold;">or</span> String), <span class="hljs-keyword" style="font-weight: bold;">and</span> <span class="hljs-keyword" style="font-weight: bold;">as</span> far <span class="hljs-keyword" style="font-weight: bold;">as</span> <span class="hljs-keyword" style="font-weight: bold;">the</span> user <span class="hljs-keyword" style="font-weight: bold;">at</span> <span class="hljs-keyword" style="font-weight: bold;">the</span> call site <span class="hljs-keyword" style="font-weight: bold;">is</span> concerned, there <span class="hljs-keyword" style="font-weight: bold;">is</span> no visible conversion (even <span class="hljs-keyword" style="font-weight: bold;">if</span> one <span class="hljs-keyword" style="font-weight: bold;">is</span> happening <span class="hljs-keyword" style="font-weight: bold;">behind</span> <span class="hljs-keyword" style="font-weight: bold;">the</span> scenes)
</code></pre><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class=""><a href="https://github.com/apple/swift-evolution/blob/master/proposals/0041-conversion-protocol-conventions.md" style="color: rgb(13, 110, 161); text-decoration: none; transition: color 0.2s ease-in-out; -webkit-transition: color 0.2s ease-in-out;" class="">An earlier proposal</a> was intended to address the first problem by introducing strong naming conventions for three kinds of conversion protocols (<em style="line-height: 1;" class="">from</em>, <em style="line-height: 1;" class="">to</em>, and <em style="line-height: 1;" class="">bidirectional</em>). The review highlighted the difficulity in establishing conventions that everyone is happy with. This proposal takes a different approach to solving the problem that originally inspired that proposal while also solving the awkwardness of the current names described by the standard library team.</p><h2 id="proposedsolution" style="color: rgb(17, 17, 17); font-size: 27px; line-height: 42px; margin-top: 42px; margin-bottom: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Proposed solution</h2><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">This proposal addresses both problems by introducing a <code style="line-height: 1;" class="">Syntax</code> “namespace” and moving the <code style="line-height: 1;" class="">*LiteralConvertible</code> protocols into that “namespace” while also renaming them. The proposal <strong style="line-height: 1;" class="">does not</strong> make any changes to the requirements of the protocols.</p><h2 id="detaileddesign" style="color: rgb(17, 17, 17); font-size: 27px; line-height: 42px; margin-top: 42px; margin-bottom: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Detailed design</h2><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">All of the <code style="line-height: 1;" class="">*LiteralConvertible</code> protocols will receive new <code style="line-height: 1;" class="">*Literal</code> names inside a <code style="line-height: 1;" class="">Syntax</code>namespace. </p><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">This namespace will initially be implemented using a case-less <code style="line-height: 1;" class="">enum</code>, but this detail may change in the future if submodules or namespaces are added to Swift. Swift does not currently allow protocols to be declared inside the scope of a type. In order to work around this limitation the protocols themselves will be declared using underscore-prefixed names internal to the standard library. Typealiases inside the <code style="line-height: 1;" class="">Syntax</code> enum will declare the names intended to be visible to user code.</p><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">This proposal does not change any requirements of these protocols. All requirements of all <code style="line-height: 1;" class="">*LiteralConvertible</code> protocols will remain exactly the same.</p><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">The following protocol declarations and names:</p><pre style="margin-top: 21px; margin-bottom: 21px; tab-size: 4; color: rgb(17, 17, 17); font-size: 15px;" class=""><code class="swift hljs" style="line-height: inherit; display: block; padding: 0.5em; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248); height: auto; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">NilLiteralConvertible</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">BooleanLiteralConvertible</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">FloatLiteralConvertible</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">IntegerLiteralConvertible</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">UnicodeScalarLiteralConvertible</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">ExtendedGraphemeClusterConvertible</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">StringLiteralLiteralConvertible</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">StringInterpolationLiteralConvertible</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">ArrayLiteralConvertible</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">DictionaryLiteralConvertible</span> </span>{ ... }</code></pre><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">Are changed as follows:</p><pre style="margin-top: 21px; margin-bottom: 21px; tab-size: 4; color: rgb(17, 17, 17); font-size: 15px;" class=""><code class="swift hljs" style="line-height: inherit; display: block; padding: 0.5em; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248); height: auto; background-position: initial initial; background-repeat: initial initial;">
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_NilLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_BooleanLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_IntegerLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_FloatLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_UnicodeScalarLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_ExtendedGraphemeClusterLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_StringLiteralLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_StringInterpolationLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_ArrayLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">protocol</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">_DictionaryLiteralSyntax</span> </span>{ ... }
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-comment" style="color: rgb(153, 153, 136); font-style: italic;">/* closed */</span> <span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">enum</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">Syntax</span> </span>{
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">NilLiteral</span> = _NilLiteralSyntax
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">BooleanLiteral</span> = _BooleanLiteralSyntax
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">IntegerLiteral</span> = _IntegerLiteralSyntax
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">FloatLiteral</span> = _FloatLiteralSyntax
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">UnicodeScalarLiteral</span> = _UnicodeScalarLiteralSyntax
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">ExtendedGraphemeClusterLiteral</span> = _ExtendedGraphemeClusterLiteralSyntax
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">StringLiteralLiteral</span> = _StringLiteralLiteralSyntax
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">StringInterplolationLiteral</span> = _StringInterpolationLiteralSyntax
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">ArrayrLiteral</span> = _ArrayLiteralSyntax
<span class="hljs-keyword" style="font-weight: bold;">public</span> <span class="hljs-keyword" style="font-weight: bold;">typealias</span> <span class="hljs-type">DictionaryLiteral</span> = _DictionaryLiteralSyntax
}</code></pre><h2 id="impactonexistingcode" style="color: rgb(17, 17, 17); font-size: 27px; line-height: 42px; margin-top: 42px; margin-bottom: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Impact on existing code</h2><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">All code that references any of the <code style="line-height: 1;" class="">*LiteralConvertible</code> protocols will need to be modified to reference the protocol via the new <code style="line-height: 1;" class="">Syntax.*Literal</code> name.</p><h2 id="alternativesconsidered" style="color: rgb(17, 17, 17); font-size: 27px; line-height: 42px; margin-top: 42px; margin-bottom: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Alternatives considered</h2><h3 id="protocolnames" style="color: rgb(17, 17, 17); margin: 21px 0px; font-size: 20px; line-height: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Protocol names</h3><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">Several commenters have suggested that the names in this proposal are confusing at the site of use:</p><pre style="margin-top: 21px; margin-bottom: 21px; tab-size: 4; color: rgb(17, 17, 17); font-size: 15px;" class=""><code class="swift hljs" style="line-height: inherit; display: block; padding: 0.5em; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248); height: auto; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">struct</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">Foo</span>: <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">Syntax</span>.<span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">IntegerLiteral</span> </span>{ ... }</code></pre><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">One alternative naming scheme would emphasize the semantic of initializing the type with a literal:</p><pre style="margin-top: 21px; margin-bottom: 21px; tab-size: 4; color: rgb(17, 17, 17); font-size: 15px;" class=""><code class="swift hljs" style="line-height: inherit; display: block; padding: 0.5em; color: rgb(51, 51, 51); background-color: rgb(248, 248, 248); height: auto; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-class"><span class="hljs-keyword" style="font-weight: bold;">struct</span> <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">Foo</span>: <span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">Syntax</span>.<span class="hljs-title" style="color: rgb(68, 85, 136); font-weight: bold;">IntegerLiteralInitializable</span> </span>{ ... }</code></pre><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">Discussion of the pros and cons of the proposed and alternative naming schemes is encouraged. The core team should feel free to make a final decision on the exact naming scheme used if they choose to accept this proposal.</p><h3 id="previousproposal" style="color: rgb(17, 17, 17); margin: 21px 0px; font-size: 20px; line-height: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Previous proposal</h3><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">This proposal is a follow up to <a href="https://github.com/apple/swift-evolution/blob/master/proposals/0041-conversion-protocol-conventions.md" style="color: rgb(13, 110, 161); text-decoration: none; transition: color 0.2s ease-in-out; -webkit-transition: color 0.2s ease-in-out;" class="">Updating Protocol Naming Conventions for Conversions</a>. Many related alternatives were explored during the discussion and review of that proposal.</p><h2 id="acknowledgements" style="color: rgb(17, 17, 17); font-size: 27px; line-height: 42px; margin-top: 42px; margin-bottom: 21px; font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif;" class="">Acknowledgements</h2><p style="color: rgb(17, 17, 17); font-family: 'Helvetica Neue', Helvetica, Arial, Verdana, sans-serif; word-wrap: break-word; margin: 1.3125em 0px; font-size: 1.1429em; line-height: 1.3125em;" class="">The design described in this proposal was suggested by Dave Abrahams, Dmitri Gribenko, and Maxim Moiseev.</p></div></div>_______________________________________________<br class="">swift-evolution mailing list<br class=""><a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a><br class="">https://lists.swift.org/mailman/listinfo/swift-evolution<br class=""></div></blockquote></div><br class=""></body></html>