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.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>The general idea of a keyword <code>vector</code> kept me thinking for quite a while.</p>
<p>Could such a keyword potentially replace a <code>Tuple</code>?</p>
<pre><code class="swift">let aTuple: (Int, Int, Int, Int, Int, Int, Int, Int) = (1,2,3,4,5,6,7,8)
let aVector: vector(8) Int = (1,2,3,4,5,6,7,8)
// or `Int vector(8)`
// or `vector(of: 8) Int`
// or `Int vector(of: 8)`
</code></pre>
<p>It’s way easier to write and it reads well to.</p>
<p>There are other potential designs vor such a keyword that I could think of:</p>
<pre><code class="swift">#vector(Int, 8)
#vector(8, Int)
#vector(of: 8, Int)
</code></pre>
<p>Or we could combine the idea of vectors with tuples. By that I mean that we still should be able to write labeled tuples/vectors like:</p>
<pre><code class="swift">typealias MyType = (a: Int, b: Int) // labeled `vector(2) Int`
</code></pre>
<p>As for variadic generics:</p>
<pre><code class="swift">func foo<vector T>(a: vector(3) String, b: T) {
print(a.0)
print(a.1)
print(a.2)
print(b)
}
</code></pre>
<p>When using vectors inside the angle brackets, <code>vector T</code> represents an arbitrary number of n individual, independent type parameters such as <code>T1</code>, <code>T2</code>, … , <code>Tn</code>. And we also could limit the number of the generic parameters we want. </p>
<pre><code class="swift">func boo<vector(2) T>(a: T) {
// here we know the exact boundary and it's safe to use the index of the vector
print(type(of: a.0)) // T1
print(type(of: a.1)) // T2
print(type(of: a.2)) // T3
}
</code></pre>
<p>We should also be able to define a variable boundary which can only be using in other vectors of the same scope.</p>
<pre><code class="swift">let a: vector(8) Int = (1,1,1,1,1,1,1,1)
let b: vector(8) Int = (1,1,1,1,1,1,1,1)
// vectors can be passed by tuples/vectors
// here is `x` a variable boundary
func add(a: vector(x) Int, b: vector(x) Int) -> vector(x) Int {
return a + b
}
add(a: a, b: b) // returns (2,2,2,2,2,2,2,2)
</code></pre>
<p>The Swift community also want to extend tuples one day. We should be able to this with vectors as well:</p>
<pre><code class="swift">extension (Int, Int) { … }
// VS:
extension vector(2) Int { … }
</code></pre>
<p>Vectors would fully eliminate that ugly <code>…</code> pre-/postfix and leave it only for ranges.</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_1479924784515928064" 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 22. November 2016 um 12:49:39, Karl (<a href="mailto:razielim@gmail.com">razielim@gmail.com</a>) schrieb:</p> <blockquote type="cite" class="clean_bq"><span><div><span style="color: rgb(0, 0, 0); font-family: 'helvetica Neue', helvetica; 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-size-adjust: auto; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;">I’m okay with prefix … in the generic parameter list, but I don’t think variable declarations should have any annotation at all. We don’t declare an array as `array var myList: String`.</span></div></span></blockquote></div><div class="bloop_markdown"><p></p></div></body></html>