<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jul 13, 2016, at 5:39 PM, Dave Abrahams 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=""><br style="font-family: Palatino-Roman; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Palatino-Roman; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">on Wed Jul 13 2016, Brent Royal-Gordon <</span><a href="mailto:swift-evolution@swift.org" style="font-family: Palatino-Roman; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">swift-evolution@swift.org</a><span style="font-family: Palatino-Roman; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">> wrote:</span><br style="font-family: Palatino-Roman; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><blockquote type="cite" style="font-family: Palatino-Roman; font-size: 14px; font-style: normal; font-variant-caps: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-weight: normal;" class="">I think grouping these into a type is a sensible approach, but I don't<br class="">like that</span><b class=""> it allows the creation of meaningless MemoryLayout<br class="">instances</b>. The simplest fix would be to make `MemoryLayout` an empty<br class="">enum instead of an empty struct. This would convey that no<br class="">MemoryLayout instances do or can exist.<br class=""></blockquote><br style="font-family: Palatino-Roman; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><span style="font-family: Palatino-Roman; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">+1.</span><br style="font-family: Palatino-Roman; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""></div></blockquote></div><br class=""><div class="">+1 as well.</div><div class=""><br class=""></div><div class=""><pre style="box-sizing: border-box; font-family: monospace, serif; font-size: 17px; white-space: pre-wrap; word-wrap: break-word; color: rgb(5, 0, 0); background-color: rgb(255, 254, 254);" class="">/// Accesses the memory layout of `T` through its
/// `size`, `stride`, and `alignment` properties
public enum MemoryLayout {
/// Returns the contiguous memory footprint of `T`.
///
/// Does not include any dynamically-allocated or "remote"
/// storage. In particular, `MemoryLayout.size`, when
/// `T` is a class type, is the same regardless of how many
/// stored properties `T` has.
public static var size: Int { return _sizeof(T.self) }
/// For instances of `T` in an `Array`, returns the number of
/// bytes from the start of one instance to the start of the
/// next. This is the same as the number of bytes moved when an
/// `UnsafePointer` is incremented. `T` may have a lower minimal
/// alignment that trades runtime performance for space
/// efficiency. The result is always positive.
public static var stride: Int { return _strideof(T.self) }
/// Returns the default memory alignment of `T`.
public static var alignment: Int { return _alignof(T.self) }
}</pre><div class=""><br class=""></div></div><div class=""><br class=""></div><div class="">-- E</div><div class=""><br class=""></div></body></html>