<div dir="ltr"><div><br></div>Oops. Kindly disregard my previous emails. Ben was kind enough to point out to me that I was confusing dictionary literals with DictionaryLiteral<div><br><div class="gmail_quote">On Tue, Jan 9, 2018 at 8:56 PM, Ben Cohen <span dir="ltr"><></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="auto"><div></div><div>Hi Charles,</div><div><br></div><div>The naming issue strikes again :)</div><div><br></div><div>Your code is making use of dictionary literals, not DictionaryLiteral. We are talking about the (clearly confusingly named!) DictionaryLiteral type, which is a type you can create from a dictionary literal. (See docs here: <a href="https://developer.apple.com/documentation/swift/dictionaryliteral" target="_blank">https://developer.apple.<wbr>com/documentation/swift/<wbr>dictionaryliteral</a>)</div><div><br></div><div>There’s no suggestion of getting rid of the ExpressibleByDictionaryLiteral capability. </div><div><br></div><div>“Ceci n’est pas une literal”</div><div> - Magritte</div><div><br>On Jan 9, 2018, at 8:26 PM, Charles Constant via swift-evolution <<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr">Hi Nevin (et al) <div><br></div><div>Here's the relevant section of my code. It's from a protocol I use called "ParameterSet" to extend OptionSets to contain small numbers (like an Enum with an associated type, but all the data is stored in the UInt). Wouldn't be my first choice to share, as it breaks KISS. Anyhow, the "<wbr>ExpressibleByDictionaryLiteral<wbr>" lets me specify a "params" template tersely. I only found out how to use the -Literal initializers last year. I love them.</div><div><div><br></div><div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>struct DrumNote: ParameterSet {</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span></div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>let rawValue: UInt</div><div><br></div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>static let params: [ParamType] = [ ["velocity":0...255], "flam", "roll", "reverse" ]</div><div><br></div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>static let</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>velocity<span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>= param(0),</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>flam<span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>= param(1),</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>roll<span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>= param(2),</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>reverse<span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>= param(3),</div><div><br></div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>// ...</div><div><br></div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>}</div><div><br></div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>enum ParamType: ExpressibleByStringLiteral, ExpressibleByDictionaryLiteral {</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span></div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>public init( dictionaryLiteral elements: (String,Any)... ) {</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>if let pair = elements.first as? (String,ClosedRange<<wbr>FloatLiteralType>) { self = .doub(pair.0,pair.1) }</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>else if let pair = elements.first as? (String,CountableClosedRange<<wbr>IntegerLiteralType>) { self = .int(pair.0, pair.1.lowerBound ... pair.1.upperBound ) }</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>else { fatalError("Can only init from Double...Double or Int...Int") }</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>}</div><div><br></div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>// ...</div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span></div><div><span class="gmail-m_4449909344175415166gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>}</div></div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 9, 2018 at 6:10 PM, Nevin Brackett-Rozinsky <span dir="ltr"><<a href="mailto:nevin.brackettrozinsky@gmail.com" target="_blank">nevin.brackettrozinsky@gmail.<wbr>com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Tue, Jan 9, 2018 at 7:47 PM, <a href="mailto:charles@charlesism.com" target="_blank">charles@charlesism.com</a> <span dir="ltr"><<a href="mailto:charlesism.com@gmail.com" target="_blank">charlesism.com@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="auto">I used a DictionaryLiteral only yesterday, and it turned what would have a typically unreadable array of Structs into something much more elegant. I'm pretty sure the only reason Literals (of all varieties) aren't used more often is because Swift programmers don't realize they are available and easy to implement. <br></div></blockquote><div><br></div><div>Could you provide an example of how you used DictionaryLiteral?</div><span class="gmail-m_4449909344175415166gmail-HOEnZb"><font color="#888888"><div><br></div><div>Nevin </div></font></span></div></div></div></blockquote></div><br></div></div></div></blockquote><blockquote type="cite">______________________________<wbr>_________________<br>swift-evolution mailing list<br><a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a><br><a href="https://lists.swift.org/mailman/listinfo/swift-evolution" target="_blank">https://lists.swift.org/<wbr>mailman/listinfo/swift-<wbr>evolution</a><br></blockquote><div><br></div></div></blockquote></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 9, 2018 at 8:26 PM, Charles Constant via swift-evolution <span dir="ltr"><<a href="mailto:swift-evolution@swift.org" target="_blank">swift-evolution@swift.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi Nevin (et al) <div><br></div><div>Here's the relevant section of my code. It's from a protocol I use called "ParameterSet" to extend OptionSets to contain small numbers (like an Enum with an associated type, but all the data is stored in the UInt). Wouldn't be my first choice to share, as it breaks KISS. Anyhow, the "<wbr>ExpressibleByDictionaryLiteral<wbr>" lets me specify a "params" template tersely. I only found out how to use the -Literal initializers last year. I love them.</div><div><div><br></div><div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>struct DrumNote: ParameterSet {</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span></div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>let rawValue: UInt</div><div><br></div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>static let params: [ParamType] = [ ["velocity":0...255], "flam", "roll", "reverse" ]</div><div><br></div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>static let</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>velocity<span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>= param(0),</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>flam<span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>= param(1),</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>roll<span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>= param(2),</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>reverse<span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>= param(3),</div><div><br></div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>// ...</div><div><br></div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>}</div><div><br></div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>enum ParamType: ExpressibleByStringLiteral, ExpressibleByDictionaryLiteral {</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span></div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>public init( dictionaryLiteral elements: (String,Any)... ) {</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>if let pair = elements.first as? (String,ClosedRange<<wbr>FloatLiteralType>) { self = .doub(pair.0,pair.1) }</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>else if let pair = elements.first as? (String,CountableClosedRange<<wbr>IntegerLiteralType>) { self = .int(pair.0, pair.1.lowerBound ... pair.1.upperBound ) }</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>else { fatalError("Can only init from Double...Double or Int...Int") }</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>}</div><div><br></div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>// ...</div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span></div><div><span class="gmail-m_6763855055537614895gmail-Apple-tab-span" style="white-space:pre-wrap"> </span>}</div></div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jan 9, 2018 at 6:10 PM, Nevin Brackett-Rozinsky <span dir="ltr"><<a href="mailto:nevin.brackettrozinsky@gmail.com" target="_blank">nevin.brackettrozinsky@gmail.<wbr>com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Tue, Jan 9, 2018 at 7:47 PM, <a href="mailto:charles@charlesism.com" target="_blank">charles@charlesism.com</a> <span dir="ltr"><<a href="mailto:charlesism.com@gmail.com" target="_blank">charlesism.com@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="auto"><div>I used a DictionaryLiteral only yesterday, and it turned what would have a typically unreadable array of Structs into something much more elegant. I'm pretty sure the only reason Literals (of all varieties) aren't used more often is because Swift programmers don't realize they are available and easy to implement. <br></div></div></blockquote><div><br></div><div>Could you provide an example of how you used DictionaryLiteral?</div><span class="gmail-m_6763855055537614895gmail-HOEnZb"><font color="#888888"><div><br></div><div>Nevin </div></font></span></div></div></div>
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