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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>CCFQueue (containers.CCFQueue)</title><link rel="stylesheet" href="../../odoc.css"/><meta charset="utf-8"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body><div class="content"><header><nav><a href="../index.html">Up</a> – <a href="../index.html">containers</a> » CCFQueue</nav><h1>Module <code>CCFQueue</code></h1><h2 id="functional-queues"><a href="#functional-queues" class="anchor"></a>Functional queues</h2><nav class="toc"><ul><li><a href="#basics">Basics</a></li><li><a href="#individual-extraction">Individual extraction</a></li><li><a href="#global-operations">Global Operations</a></li><li><a href="#conversions">Conversions</a></li></ul></nav></header><dl><dt class="spec type" id="type-sequence"><a href="#type-sequence" class="anchor"></a><code><span class="keyword">type </span>'a sequence</code><code><span class="keyword"> = </span>(<span class="type-var">'a</span> <span>-></span> unit) <span>-></span> unit</code></dt><dt class="spec type" id="type-klist"><a href="#type-klist" class="anchor"></a><code><span class="keyword">type </span>'a klist</code><code><span class="keyword"> = </span>unit <span>-></span> [ `Nil<span class="keyword"> | </span>`Cons of <span class="type-var">'a</span><span class="keyword"> * </span><span class="type-var">'a</span> <a href="index.html#type-klist">klist</a> ]</code></dt><dt class="spec type" id="type-equal"><a href="#type-equal" class="anchor"></a><code><span class="keyword">type </span>'a equal</code><code><span class="keyword"> = </span><span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span> <span>-></span> bool</code></dt><dt class="spec type" id="type-printer"><a href="#type-printer" class="anchor"></a><code><span class="keyword">type </span>'a printer</code><code><span class="keyword"> = </span>Format.formatter <span>-></span> <span class="type-var">'a</span> <span>-></span> unit</code></dt></dl><section><header><h2 id="basics"><a href="#basics" class="anchor"></a>Basics</h2></header><dl><dt class="spec type" id="type-t"><a href="#type-t" class="anchor"></a><code><span class="keyword">type </span>+'a t</code></dt><dd><p>Queue containing elements of type 'a</p></dd></dl><dl><dt class="spec value" id="val-empty"><a href="#val-empty" class="anchor"></a><code><span class="keyword">val </span>empty : <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-is_empty"><a href="#val-is_empty" class="anchor"></a><code><span class="keyword">val </span>is_empty : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> bool</code></dt><dt class="spec value" id="val-singleton"><a href="#val-singleton" class="anchor"></a><code><span class="keyword">val </span>singleton : <span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-doubleton"><a href="#val-doubleton" class="anchor"></a><code><span class="keyword">val </span>doubleton : <span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt></dl><dl><dt class="spec exception" id="exception-Empty"><a href="#exception-Empty" class="anchor"></a><code><span class="keyword">exception </span></code><code><span class="exception">Empty</span></code></dt></dl><dl><dt class="spec value" id="val-cons"><a href="#val-cons" class="anchor"></a><code><span class="keyword">val </span>cons : <span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dd><p>Push element at the front of the queue.</p></dd></dl><dl><dt class="spec value" id="val-snoc"><a href="#val-snoc" class="anchor"></a><code><span class="keyword">val </span>snoc : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dd><p>Push element at the end of the queue.</p></dd></dl><dl><dt class="spec value" id="val-take_front"><a href="#val-take_front" class="anchor"></a><code><span class="keyword">val </span>take_front : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> (<span class="type-var">'a</span><span class="keyword"> * </span><span class="type-var">'a</span> <a href="index.html#type-t">t</a>) option</code></dt><dd><p>Get and remove the first element.</p></dd></dl><dl><dt class="spec value" id="val-take_front_exn"><a href="#val-take_front_exn" class="anchor"></a><code><span class="keyword">val </span>take_front_exn : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span><span class="keyword"> * </span><span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dd><p>Same as <a href="index.html#val-take_front"><code>take_front</code></a>, but fails on empty queues.</p><dl><dt>raises Empty</dt><dd><p>if the queue is empty.</p></dd></dl></dd></dl><dl><dt class="spec value" id="val-take_front_l"><a href="#val-take_front_l" class="anchor"></a><code><span class="keyword">val </span>take_front_l : int <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> list<span class="keyword"> * </span><span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dd><p><code>take_front_l n q</code> takes at most <code>n</code> elements from the front of <code>q</code>, and returns them wrapped in a list.</p><dl><dt>raises Invalid_argument</dt><dd><p>if n<0.</p></dd></dl></dd></dl><dl><dt class="spec value" id="val-take_front_while"><a href="#val-take_front_while" class="anchor"></a><code><span class="keyword">val </span>take_front_while : (<span class="type-var">'a</span> <span>-></span> bool) <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> list<span class="keyword"> * </span><span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-take_back"><a href="#val-take_back" class="anchor"></a><code><span class="keyword">val </span>take_back : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> (<span class="type-var">'a</span> <a href="index.html#type-t">t</a><span class="keyword"> * </span><span class="type-var">'a</span>) option</code></dt><dd><p>Take last element.</p></dd></dl><dl><dt class="spec value" id="val-take_back_exn"><a href="#val-take_back_exn" class="anchor"></a><code><span class="keyword">val </span>take_back_exn : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a><span class="keyword"> * </span><span class="type-var">'a</span></code></dt><dd><p>Same as <a href="index.html#val-take_back"><code>take_back</code></a>, but fails on empty queues.</p><dl><dt>raises Empty</dt><dd><p>if the queue is empty.</p></dd></dl></dd></dl><dl><dt class="spec value" id="val-take_back_l"><a href="#val-take_back_l" class="anchor"></a><code><span class="keyword">val </span>take_back_l : int <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a><span class="keyword"> * </span><span class="type-var">'a</span> list</code></dt><dd><p><code>take_back_l n q</code> removes and returns the last <code>n</code> elements of <code>q</code>. The elements are in the order of the queue, that is, the head of the returned list is the first element to appear via <a href="index.html#val-take_front"><code>take_front</code></a>. <code>take_back_l 2 (of_list [1;2;3;4]) = of_list [1;2], [3;4]</code>.</p><dl><dt>raises Invalid_argument</dt><dd><p>if n<0.</p></dd></dl></dd></dl><dl><dt class="spec value" id="val-take_back_while"><a href="#val-take_back_while" class="anchor"></a><code><span class="keyword">val </span>take_back_while : (<span class="type-var">'a</span> <span>-></span> bool) <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a><span class="keyword"> * </span><span class="type-var">'a</span> list</code></dt></dl></section><section><header><h2 id="individual-extraction"><a href="#individual-extraction" class="anchor"></a>Individual extraction</h2></header><dl><dt class="spec value" id="val-first"><a href="#val-first" class="anchor"></a><code><span class="keyword">val </span>first : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> option</code></dt><dd><p>First element of the queue.</p></dd></dl><dl><dt class="spec value" id="val-last"><a href="#val-last" class="anchor"></a><code><span class="keyword">val </span>last : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> option</code></dt><dd><p>Last element of the queue.</p></dd></dl><dl><dt class="spec value" id="val-first_exn"><a href="#val-first_exn" class="anchor"></a><code><span class="keyword">val </span>first_exn : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span></code></dt><dd><p>Same as <a href="index.html#val-first"><code>first</code></a> but</p><dl><dt>raises Empty</dt><dd><p>if the queue is empty.</p></dd></dl></dd></dl><dl><dt class="spec value" id="val-last_exn"><a href="#val-last_exn" class="anchor"></a><code><span class="keyword">val </span>last_exn : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span></code></dt><dt class="spec value" id="val-nth"><a href="#val-nth" class="anchor"></a><code><span class="keyword">val </span>nth : int <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> option</code></dt><dd><p>Return the <code>i</code>-th element of the queue in logarithmic time.</p></dd></dl><dl><dt class="spec value" id="val-nth_exn"><a href="#val-nth_exn" class="anchor"></a><code><span class="keyword">val </span>nth_exn : int <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span></code></dt><dd><p>Unsafe version of <a href="index.html#val-nth"><code>nth</code></a>.</p><dl><dt>raises Not_found</dt><dd><p>if the index is wrong.</p></dd></dl></dd></dl><dl><dt class="spec value" id="val-tail"><a href="#val-tail" class="anchor"></a><code><span class="keyword">val </span>tail : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dd><p>Queue deprived of its first element. Does nothing on empty queues.</p></dd></dl><dl><dt class="spec value" id="val-init"><a href="#val-init" class="anchor"></a><code><span class="keyword">val </span>init : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dd><p>Queue deprived of its last element. Does nothing on empty queues.</p></dd></dl></section><section><header><h2 id="global-operations"><a href="#global-operations" class="anchor"></a>Global Operations</h2></header><dl><dt class="spec value" id="val-append"><a href="#val-append" class="anchor"></a><code><span class="keyword">val </span>append : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dd><p>Append two queues. Elements from the second one come after elements of the first one. Linear in the size of the second queue.</p></dd></dl><dl><dt class="spec value" id="val-rev"><a href="#val-rev" class="anchor"></a><code><span class="keyword">val </span>rev : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dd><p>Reverse the queue, <code>O(n)</code> complexity.</p><dl><dt>since</dt><dd>0.10</dd></dl></dd></dl><dl><dt class="spec value" id="val-map"><a href="#val-map" class="anchor"></a><code><span class="keyword">val </span>map : (<span class="type-var">'a</span> <span>-></span> <span class="type-var">'b</span>) <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'b</span> <a href="index.html#type-t">t</a></code></dt><dd><p>Map values.</p></dd></dl><dl><dt class="spec value" id="val-(>|=)"><a href="#val-(>|=)" class="anchor"></a><code><span class="keyword">val </span>(>|=) : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> (<span class="type-var">'a</span> <span>-></span> <span class="type-var">'b</span>) <span>-></span> <span class="type-var">'b</span> <a href="index.html#type-t">t</a></code></dt><dd><p>Synonym to <a href="index.html#val-map"><code>map</code></a>.</p></dd></dl><dl><dt class="spec value" id="val-size"><a href="#val-size" class="anchor"></a><code><span class="keyword">val </span>size : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> int</code></dt><dd><p>Number of elements in the queue (constant time).</p></dd></dl><dl><dt class="spec value" id="val-fold"><a href="#val-fold" class="anchor"></a><code><span class="keyword">val </span>fold : (<span class="type-var">'b</span> <span>-></span> <span class="type-var">'a</span> <span>-></span> <span class="type-var">'b</span>) <span>-></span> <span class="type-var">'b</span> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'b</span></code></dt><dt class="spec value" id="val-iter"><a href="#val-iter" class="anchor"></a><code><span class="keyword">val </span>iter : (<span class="type-var">'a</span> <span>-></span> unit) <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> unit</code></dt><dt class="spec value" id="val-equal"><a href="#val-equal" class="anchor"></a><code><span class="keyword">val </span>equal : <span class="type-var">'a</span> <a href="index.html#type-equal">equal</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <a href="index.html#type-equal">equal</a></code></dt></dl></section><section><header><h2 id="conversions"><a href="#conversions" class="anchor"></a>Conversions</h2></header><dl><dt class="spec value" id="val-of_list"><a href="#val-of_list" class="anchor"></a><code><span class="keyword">val </span>of_list : <span class="type-var">'a</span> list <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-to_list"><a href="#val-to_list" class="anchor"></a><code><span class="keyword">val </span>to_list : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> list</code></dt><dt class="spec value" id="val-add_seq_front"><a href="#val-add_seq_front" class="anchor"></a><code><span class="keyword">val </span>add_seq_front : <span class="type-var">'a</span> <a href="index.html#type-sequence">sequence</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-add_seq_back"><a href="#val-add_seq_back" class="anchor"></a><code><span class="keyword">val </span>add_seq_back : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-sequence">sequence</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-to_seq"><a href="#val-to_seq" class="anchor"></a><code><span class="keyword">val </span>to_seq : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-sequence">sequence</a></code></dt><dt class="spec value" id="val-of_seq"><a href="#val-of_seq" class="anchor"></a><code><span class="keyword">val </span>of_seq : <span class="type-var">'a</span> <a href="index.html#type-sequence">sequence</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-to_klist"><a href="#val-to_klist" class="anchor"></a><code><span class="keyword">val </span>to_klist : <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-klist">klist</a></code></dt><dt class="spec value" id="val-of_klist"><a href="#val-of_klist" class="anchor"></a><code><span class="keyword">val </span>of_klist : <span class="type-var">'a</span> <a href="index.html#type-klist">klist</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-(--)"><a href="#val-(--)" class="anchor"></a><code><span class="keyword">val </span>(--) : int <span>-></span> int <span>-></span> int <a href="index.html#type-t">t</a></code></dt><dd><p><code>a -- b</code> is the integer range from <code>a</code> to <code>b</code>, both included.</p><dl><dt>since</dt><dd>0.10</dd></dl></dd></dl><dl><dt class="spec value" id="val-(--^)"><a href="#val-(--^)" class="anchor"></a><code><span class="keyword">val </span>(--^) : int <span>-></span> int <span>-></span> int <a href="index.html#type-t">t</a></code></dt><dd><p><code>a -- b</code> is the integer range from <code>a</code> to <code>b</code>, where <code>b</code> is excluded.</p><dl><dt>since</dt><dd>0.17</dd></dl></dd></dl><dl><dt class="spec value" id="val-pp"><a href="#val-pp" class="anchor"></a><code><span class="keyword">val </span>pp : <span class="type-var">'a</span> <a href="index.html#type-printer">printer</a> <span>-></span> <span class="type-var">'a</span> <a href="index.html#type-t">t</a> <a href="index.html#type-printer">printer</a></code></dt><dd><dl><dt>since</dt><dd>0.13</dd></dl></dd></dl></section></div></body></html> |