<html><head><style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
padding:1em;
margin:auto;
background:#fefefe;
}
h1, h2, h3, h4, h5, h6 {
font-weight: bold;
}
h1 {
color: #000000;
font-size: 28pt;
}
h2 {
border-bottom: 1px solid #CCCCCC;
color: #000000;
font-size: 24px;
}
h3 {
font-size: 18px;
}
h4 {
font-size: 16px;
}
h5 {
font-size: 14px;
}
h6 {
color: #777777;
background-color: inherit;
font-size: 14px;
}
hr {
height: 0.2em;
border: 0;
color: #CCCCCC;
background-color: #CCCCCC;
display: inherit;
}
p, blockquote, ul, ol, dl, li, table, pre {
margin: 15px 0;
}
a, a:visited {
color: #4183C4;
background-color: inherit;
text-decoration: none;
}
#message {
border-radius: 6px;
border: 1px solid #ccc;
display:block;
width:100%;
height:60px;
margin:6px 0px;
}
button, #ws {
font-size: 12 pt;
padding: 4px 6px;
border-radius: 5px;
border: 1px solid #bbb;
background-color: #eee;
}
code, pre, #ws, #message {
font-family: Monaco;
font-size: 10pt;
border-radius: 3px;
background-color: #F8F8F8;
color: inherit;
}
code {
border: 1px solid #EAEAEA;
margin: 0 2px;
padding: 0 5px;
}
pre {
border: 1px solid #CCCCCC;
overflow: auto;
padding: 4px 8px;
}
pre > code {
border: 0;
margin: 0;
padding: 0;
}
#ws { background-color: #f8f8f8; }
.bloop_markdown table {
border-collapse: collapse;
font-family: Helvetica, arial, freesans, clean, sans-serif;
color: rgb(51, 51, 51);
font-size: 15px; line-height: 25px;
padding: 0; }
.bloop_markdown table tr {
border-top: 1px solid #cccccc;
background-color: white;
margin: 0;
padding: 0; }
.bloop_markdown table tr:nth-child(2n) {
background-color: #f8f8f8; }
.bloop_markdown table tr th {
font-weight: bold;
border: 1px solid #cccccc;
margin: 0;
padding: 6px 13px; }
.bloop_markdown table tr td {
border: 1px solid #cccccc;
margin: 0;
padding: 6px 13px; }
.bloop_markdown table tr th :first-child, table tr td :first-child {
margin-top: 0; }
.bloop_markdown table tr th :last-child, table tr td :last-child {
margin-bottom: 0; }
.bloop_markdown blockquote{
border-left: 4px solid #dddddd;
padding: 0 15px;
color: #777777; }
blockquote > :first-child {
margin-top: 0; }
blockquote > :last-child {
margin-bottom: 0; }
code, pre, #ws, #message {
word-break: normal;
word-wrap: normal;
}
hr {
display: inherit;
}
.bloop_markdown :first-child {
-webkit-margin-before: 0;
}
code, pre, #ws, #message {
font-family: Menlo, Consolas, Liberation Mono, Courier, monospace;
}
.send { color:#77bb77; }
.server { color:#7799bb; }
.error { color:#AA0000; }</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="bloop_markdown"><p>Are anonymous enum cases still in Swift 4 scope?</p>
<p></p></div><div class="bloop_original_html"><style>body{font-family:Helvetica,Arial;font-size:13px}</style><div id="bloop_customfont" style="font-family:Helvetica,Arial;font-size:13px; color: rgba(0,0,0,1.0); margin: 0px; line-height: auto;"><br></div> <br> <div id="bloop_sign_1489571932277189888" class="bloop_sign"><div style="font-family:helvetica,arial;font-size:13px">-- <br>Adrian Zubarev<br>Sent with Airmail</div></div> <br><p class="airmail_on">Am 9. März 2017 um 15:00:48, Matthew Johnson via swift-evolution (<a href="mailto:swift-evolution@swift.org">swift-evolution@swift.org</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div><div></div><div>+1. Combining this with overloaded cases will be very nice for some kinds of enums.<br><br>Sent from my iPad<br><br>> On Mar 8, 2017, at 9:09 PM, Daniel Duan via swift-evolution <swift-evolution@swift.org> wrote:<br>> <br>> Hi all,<br>> <br>> During review for the first revision of SE-0155, Dave Abraham suggested that we should allow enum cases without base names. So here’s a (rough) draft of a proposal for this feature. Please read and share your thoughts!<br>> <br>> # Anonymous Enum Cases<br>> <br>> * Proposal: [SE-NNNN](NNNN-anonymous-enum-cases.md)<br>> * Authors: [Daniel Duan](https://github.com/dduan)<br>> * Review Manager: TBD<br>> * Status: **Awaiting review**<br>> <br>> ## Introduction<br>> <br>> This proposal adds anonymous cases to Swift's enum.<br>> <br>> ## Motivation<br>> <br>> Naming things is a tough task for programmer. This is one merit of features such<br>> as anonymous function and tuples: users can use them in a limited scope and skip<br>> the mind burden of coming up with names. We can expand this convenience to enums<br>> by allowing user to declare, construct and pattern match anonymous cases.<br>> <br>> ## Proposed solution<br>> <br>> Add anonymous cases to Swift's enum.<br>> <br>> ## Detailed design<br>> <br>> Anonymous enums can be declared with this syntax:<br>> <br>> ```swift<br>> enum Foo {<br>> case (Int)<br>> case (label0: Int, label1: String)<br>> }<br>> ```<br>> <br>> Anonymous case without any associated values is not allowed.<br>> <br>> Anonymous case values can be constructed with constructors with the enum's name<br>> being their base name. Following the example:<br>> <br>> ```swift<br>> Foo(42) // constructs `Foo` case corresponding to `case (Int)`<br>> Foo(label0: 0, labe1: "hello") // value of type Foo, 2nd case.<br>> Foo(label0: label1:)(0, "hello") // constructs the same value, SE-0155 syntax<br>> ```<br>> <br>> For pattern matching, rules remain the same as regular cases, execpt, naturally,<br>> the base name shall be skipped.<br>> <br>> ```swift<br>> case .(let x) = Foo(42) // x has value 42<br>> case .(label0: let a, label1: let b) = Foo(label0: 0, label1: "hello") // ok<br>> ```<br>> <br>> ## Source compatibility<br>> <br>> This is additive. It's fully source compatible with Swift 3.<br>> <br>> ## Effect on ABI stability<br>> <br>> This feature adds new possibilities to symbols exposed by enum declarations.<br>> <br>> ## Effect on API resilience<br>> <br>> ## Alternatives considered<br>> <br>> It may seem "regular" to make user use `_` in place of base name in<br>> declarations. The author think that's a perspective that only makes sense for<br>> language designer/compiler implementors. To a user, the syntax chosen in this<br>> proposal is clear and succinct.<br>> <br>> <br>> <br>> _______________________________________________<br>> swift-evolution mailing list<br>> swift-evolution@swift.org<br>> https://lists.swift.org/mailman/listinfo/swift-evolution<br><br>_______________________________________________<br>swift-evolution mailing list<br>swift-evolution@swift.org<br>https://lists.swift.org/mailman/listinfo/swift-evolution<br></div></div></span></blockquote></div><div class="bloop_markdown"><p></p></div></body></html>