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<html xmlns="http://www.w3.org/1999/xhtml"
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    >BundledPatterns2</title
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  ><body
  ><div id="package-header"
    ><span class="caption empty"
      >&nbsp;</span
      ><ul class="links" id="page-menu"
      ><li
	><a href="#"
	  >Contents</a
	  ></li
	><li
	><a href="#"
	  >Index</a
	  ></li
	></ul
      ></div
    ><div id="content"
    ><div id="module-header"
      ><table class="info"
	><tr
	  ><th
	    >Safe Haskell</th
	    ><td
	    >Safe-Inferred</td
	    ></tr
	  ><tr
	  ><th
	    >Language</th
	    ><td
	    >Haskell2010</td
	    ></tr
	  ></table
	><p class="caption"
	>BundledPatterns2</p
	></div
      ><div id="synopsis"
      ><details id="syn"
	><summary
	  >Synopsis</summary
	  ><ul class="details-toggle" data-details-id="syn"
	  ><li class="src short"
	    ><span class="keyword"
	      >data</span
	      > <a href="#"
	      >Vec</a
	      > :: <a href="#" title="GHC.TypeLits"
	      >Nat</a
	      > -&gt; * -&gt; * <span class="keyword"
	      >where</span
	      ><ul class="subs"
	      ><li
		><span class="keyword"
		  >pattern</span
		  > <a href="#"
		  >(:&gt;)</a
		  > :: a -&gt; <a href="#" title="BundledPatterns2"
		  >Vec</a
		  > n a -&gt; <a href="#" title="BundledPatterns2"
		  >Vec</a
		  > (n <a href="#" title="Bug310"
		  >+</a
		  > 1) a</li
		><li
		><span class="keyword"
		  >pattern</span
		  > <a href="#"
		  >Empty</a
		  > :: <a href="#" title="BundledPatterns2"
		  >Vec</a
		  > 0 a</li
		></ul
	      ></li
	    ><li class="src short"
	    ><span class="keyword"
	      >data</span
	      > <a href="#"
	      >RTree</a
	      > :: <a href="#" title="GHC.TypeLits"
	      >Nat</a
	      > -&gt; * -&gt; * <span class="keyword"
	      >where</span
	      ><ul class="subs"
	      ><li
		><span class="keyword"
		  >pattern</span
		  > <a href="#"
		  >LR</a
		  > :: a -&gt; <a href="#" title="BundledPatterns2"
		  >RTree</a
		  > 0 a</li
		><li
		><span class="keyword"
		  >pattern</span
		  > <a href="#"
		  >BR</a
		  > :: <a href="#" title="BundledPatterns2"
		  >RTree</a
		  > d a -&gt; <a href="#" title="BundledPatterns2"
		  >RTree</a
		  > d a -&gt; <a href="#" title="BundledPatterns2"
		  >RTree</a
		  > (d <a href="#" title="Bug310"
		  >+</a
		  > 1) a</li
		></ul
	      ></li
	    ></ul
	  ></details
	></div
      ><div id="interface"
      ><h1
	>Documentation</h1
	><div class="top"
	><p class="src"
	  ><span class="keyword"
	    >data</span
	    > <a id="t:Vec" class="def"
	    >Vec</a
	    > :: <a href="#" title="GHC.TypeLits"
	    >Nat</a
	    > -&gt; * -&gt; * <span class="keyword"
	    >where</span
	    > <a href="#" class="selflink"
	    >#</a
	    ></p
	  ><div class="doc"
	  ><p
	    >Fixed size vectors.</p
	    ><ul
	    ><li
	      >Lists with their length encoded in their type</li
	      ><li
	      ><code
		><a href="#" title="BundledPatterns2"
		  >Vec</a
		  ></code
		>tor elements have an <strong
		>ASCENDING</strong
		> subscript starting from 0 and
   ending at <code
		><code
		  ><a href="#" title="Data.List"
		    >length</a
		    ></code
		  > - 1</code
		>.</li
	      ></ul
	    ></div
	  ><div class="subs bundled-patterns"
	  ><p class="caption"
	    >Bundled Patterns</p
	    ><table
	    ><tr
	      ><td class="src"
		><span class="keyword"
		  >pattern</span
		  > <a id="v::-62-" class="def"
		  >(:&gt;)</a
		  > :: a -&gt; <a href="#" title="BundledPatterns2"
		  >Vec</a
		  > n a -&gt; <a href="#" title="BundledPatterns2"
		  >Vec</a
		  > (n <a href="#" title="Bug310"
		  >+</a
		  > 1) a <span class="fixity"
		  >infixr 5</span
		  ><span class="rightedge"
		  ></span
		  ></td
		><td class="doc"
		><p
		  >Add an element to the head of a vector.</p
		  ><pre class="screen"
		  ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >3:&gt;4:&gt;5:&gt;Nil
</code
		      ></strong
		    >&lt;3,4,5&gt;
<code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >let x = 3:&gt;4:&gt;5:&gt;Nil
</code
		      ></strong
		    ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >:t x
</code
		      ></strong
		    >x :: Num a =&gt; Vec 3 a
</pre
		  ><p
		  >Can be used as a pattern:</p
		  ><pre class="screen"
		  ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >let f (x :&gt; y :&gt; _) = x + y
</code
		      ></strong
		    ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >:t f
</code
		      ></strong
		    >f :: Num a =&gt; Vec ((n + 1) + 1) a -&gt; a
<code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >f (3:&gt;4:&gt;5:&gt;6:&gt;7:&gt;Nil)
</code
		      ></strong
		    >7
</pre
		  ><p
		  >Also in conjunctions with (<code
		    >:&lt;</code
		    >):</p
		  ><pre class="screen"
		  ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >let g (a :&gt; b :&gt; (_ :&lt; y :&lt; x)) = a + b +  x + y
</code
		      ></strong
		    ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >:t g
</code
		      ></strong
		    >g :: Num a =&gt; Vec ((((n + 1) + 1) + 1) + 1) a -&gt; a
<code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >g (1:&gt;2:&gt;3:&gt;4:&gt;5:&gt;Nil)
</code
		      ></strong
		    >12
</pre
		  ></td
		></tr
	      ><tr
	      ><td class="src"
		><span class="keyword"
		  >pattern</span
		  > <a id="v:Empty" class="def"
		  >Empty</a
		  > :: <a href="#" title="BundledPatterns2"
		  >Vec</a
		  > 0 a</td
		><td class="doc empty"
		>&nbsp;</td
		></tr
	      ></table
	    ></div
	  ></div
	><div class="top"
	><p class="src"
	  ><span class="keyword"
	    >data</span
	    > <a id="t:RTree" class="def"
	    >RTree</a
	    > :: <a href="#" title="GHC.TypeLits"
	    >Nat</a
	    > -&gt; * -&gt; * <span class="keyword"
	    >where</span
	    > <a href="#" class="selflink"
	    >#</a
	    ></p
	  ><div class="doc"
	  ><p
	    >Perfect depth binary tree.</p
	    ><ul
	    ><li
	      >Only has elements at the leaf of the tree</li
	      ><li
	      >A tree of depth <em
		>d</em
		> has <em
		>2^d</em
		> elements.</li
	      ></ul
	    ></div
	  ><div class="subs bundled-patterns"
	  ><p class="caption"
	    >Bundled Patterns</p
	    ><table
	    ><tr
	      ><td class="src"
		><span class="keyword"
		  >pattern</span
		  > <a id="v:LR" class="def"
		  >LR</a
		  > :: a -&gt; <a href="#" title="BundledPatterns2"
		  >RTree</a
		  > 0 a</td
		><td class="doc"
		><p
		  >Leaf of a perfect depth tree</p
		  ><pre class="screen"
		  ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >LR 1
</code
		      ></strong
		    >1
<code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >let x = LR 1
</code
		      ></strong
		    ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >:t x
</code
		      ></strong
		    >x :: Num a =&gt; RTree 0 a
</pre
		  ><p
		  >Can be used as a pattern:</p
		  ><pre class="screen"
		  ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >let f (LR a) (LR b) = a + b
</code
		      ></strong
		    ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >:t f
</code
		      ></strong
		    >f :: Num a =&gt; RTree 0 a -&gt; RTree 0 a -&gt; a
<code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >f (LR 1) (LR 2)
</code
		      ></strong
		    >3
</pre
		  ></td
		></tr
	      ><tr
	      ><td class="src"
		><span class="keyword"
		  >pattern</span
		  > <a id="v:BR" class="def"
		  >BR</a
		  > :: <a href="#" title="BundledPatterns2"
		  >RTree</a
		  > d a -&gt; <a href="#" title="BundledPatterns2"
		  >RTree</a
		  > d a -&gt; <a href="#" title="BundledPatterns2"
		  >RTree</a
		  > (d <a href="#" title="Bug310"
		  >+</a
		  > 1) a</td
		><td class="doc"
		><p
		  >Branch of a perfect depth tree</p
		  ><pre class="screen"
		  ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >BR (LR 1) (LR 2)
</code
		      ></strong
		    >&lt;1,2&gt;
<code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >let x = BR (LR 1) (LR 2)
</code
		      ></strong
		    ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >:t x
</code
		      ></strong
		    >x :: Num a =&gt; RTree 1 a
</pre
		  ><p
		  >Case be used a pattern:</p
		  ><pre class="screen"
		  ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >let f (BR (LR a) (LR b)) = LR (a + b)
</code
		      ></strong
		    ><code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >:t f
</code
		      ></strong
		    >f :: Num a =&gt; RTree 1 a -&gt; RTree 0 a
<code class="prompt"
		    >&gt;&gt;&gt; </code
		    ><strong class="userinput"
		    ><code
		      >f (BR (LR 1) (LR 2))
</code
		      ></strong
		    >3
</pre
		  ></td
		></tr
	      ></table
	    ></div
	  ></div
	></div
      ></div
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>