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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_GHC -O2 #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK prune #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span> <span class='hs-comment'>-- For the IsList and IsString instances</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 708</span>
<a name="line-7"></a><span class='hs-comment'>{-# LANGUAGE PatternSynonyms, ViewPatterns #-}</span>
<a name="line-8"></a><span class='hs-cpp'>#endif</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-11"></a><span class='hs-comment'>-- |</span>
<a name="line-12"></a><span class='hs-comment'>-- Module : Data.DList</span>
<a name="line-13"></a><span class='hs-comment'>-- Copyright : (c) 2006-2009 Don Stewart, 2013-2016 Sean Leather</span>
<a name="line-14"></a><span class='hs-comment'>-- License : See LICENSE file</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-- Maintainer : sean.leather@gmail.com</span>
<a name="line-17"></a><span class='hs-comment'>-- Stability : stable</span>
<a name="line-18"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-19"></a><span class='hs-comment'>--</span>
<a name="line-20"></a><span class='hs-comment'>-- Difference lists: a data structure for /O(1)/ append on lists.</span>
<a name="line-21"></a><span class='hs-comment'>--</span>
<a name="line-22"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>DList</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 800</span>
<a name="line-27"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>DList</span><span class='hs-layout'>(</span><span class='hs-conid'>Nil</span><span class='hs-layout'>,</span> <span class='hs-conid'>Cons</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-cpp'>#else</span>
<a name="line-29"></a> <span class='hs-layout'>(</span> <span class='hs-conid'>DList</span>
<a name="line-30"></a><span class='hs-cpp'>#endif</span>
<a name="line-31"></a>
<a name="line-32"></a> <span class='hs-comment'>-- * Construction</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fromList</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toList</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>apply</span>
<a name="line-36"></a>
<a name="line-37"></a> <span class='hs-comment'>-- * Basic functions</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>empty</span>
<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>singleton</span>
<a name="line-40"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>cons</span>
<a name="line-41"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>snoc</span>
<a name="line-42"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>append</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>concat</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>replicate</span>
<a name="line-45"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>list</span>
<a name="line-46"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>head</span>
<a name="line-47"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tail</span>
<a name="line-48"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unfoldr</span>
<a name="line-49"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldr</span>
<a name="line-50"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>map</span>
<a name="line-51"></a>
<a name="line-52"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 708 && __GLASGOW_HASKELL__ < 800</span>
<a name="line-53"></a> <span class='hs-comment'>-- * Pattern Synonyms</span>
<a name="line-54"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pattern</span> <span class='hs-conid'>Nil</span>
<a name="line-55"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>pattern</span> <span class='hs-conid'>Cons</span>
<a name="line-56"></a><span class='hs-cpp'>#endif</span>
<a name="line-57"></a>
<a name="line-58"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-59"></a>
<a name="line-60"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>concat</span><span class='hs-layout'>,</span> <span class='hs-varid'>foldr</span><span class='hs-layout'>,</span> <span class='hs-varid'>map</span><span class='hs-layout'>,</span> <span class='hs-varid'>head</span><span class='hs-layout'>,</span> <span class='hs-varid'>tail</span><span class='hs-layout'>,</span> <span class='hs-varid'>replicate</span><span class='hs-layout'>)</span>
<a name="line-61"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>List</span>
<a name="line-62"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>DeepSeq</span> <span class='hs-layout'>(</span><span class='hs-conid'>NFData</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-63"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>M</span>
<a name="line-64"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Function</span> <span class='hs-layout'>(</span><span class='hs-varid'>on</span><span class='hs-layout'>)</span>
<a name="line-65"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span> <span class='hs-layout'>(</span><span class='hs-conid'>IsString</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-66"></a>
<a name="line-67"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Foldable</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>F</span>
<a name="line-68"></a>
<a name="line-69"></a><span class='hs-cpp'>#if !MIN_VERSION_base(4,8,0)</span>
<a name="line-70"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-71"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Foldable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Foldable</span><span class='hs-layout'>)</span>
<a name="line-72"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span><span class='hs-layout'>(</span><span class='hs-conid'>Applicative</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-73"></a><span class='hs-cpp'>#endif</span>
<a name="line-74"></a>
<a name="line-75"></a><span class='hs-cpp'>#if MIN_VERSION_base(4,9,0)</span>
<a name="line-76"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Semigroup</span> <span class='hs-layout'>(</span><span class='hs-conid'>Semigroup</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-77"></a><span class='hs-cpp'>#endif</span>
<a name="line-78"></a>
<a name="line-79"></a><span class='hs-cpp'>#ifdef __GLASGOW_HASKELL__</span>
<a name="line-80"></a>
<a name="line-81"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Read</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lexeme</span><span class='hs-layout'>(</span><span class='hs-conid'>Ident</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>lexP</span><span class='hs-layout'>,</span> <span class='hs-varid'>parens</span><span class='hs-layout'>,</span> <span class='hs-varid'>prec</span><span class='hs-layout'>,</span> <span class='hs-varid'>readPrec</span><span class='hs-layout'>,</span> <span class='hs-varid'>readListPrec</span><span class='hs-layout'>,</span>
<a name="line-82"></a> <span class='hs-varid'>readListPrecDefault</span><span class='hs-layout'>)</span>
<a name="line-83"></a>
<a name="line-84"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 708</span>
<a name="line-85"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span> <span class='hs-layout'>(</span><span class='hs-conid'>IsList</span><span class='hs-layout'>)</span>
<a name="line-86"></a><span class='hs-comment'>-- This is for the IsList methods, which conflict with fromList, toList:</span>
<a name="line-87"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span>
<a name="line-88"></a><span class='hs-cpp'>#endif</span>
<a name="line-89"></a>
<a name="line-90"></a><span class='hs-cpp'>#endif</span>
<a name="line-91"></a>
<a name="line-92"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span><span class='hs-layout'>(</span><span class='hs-conid'>Alternative</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><|></span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-93"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span> <span class='hs-layout'>(</span><span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="DList"></a><span class='hs-comment'>-- | A difference list is a function that, given a list, returns the original</span>
<a name="line-96"></a><a name="DList"></a><span class='hs-comment'>-- contents of the difference list prepended to the given list.</span>
<a name="line-97"></a><a name="DList"></a><span class='hs-comment'>--</span>
<a name="line-98"></a><a name="DList"></a><span class='hs-comment'>-- This structure supports /O(1)/ append and snoc operations on lists, making it</span>
<a name="line-99"></a><a name="DList"></a><span class='hs-comment'>-- very useful for append-heavy uses (esp. left-nested uses of 'List.++'), such</span>
<a name="line-100"></a><a name="DList"></a><span class='hs-comment'>-- as logging and pretty printing.</span>
<a name="line-101"></a><a name="DList"></a><span class='hs-comment'>--</span>
<a name="line-102"></a><a name="DList"></a><span class='hs-comment'>-- Here is an example using DList as the state type when printing a tree with</span>
<a name="line-103"></a><a name="DList"></a><span class='hs-comment'>-- the Writer monad:</span>
<a name="line-104"></a><a name="DList"></a><span class='hs-comment'>--</span>
<a name="line-105"></a><a name="DList"></a><span class='hs-comment'>-- > import Control.Monad.Writer</span>
<a name="line-106"></a><a name="DList"></a><span class='hs-comment'>-- > import Data.DList</span>
<a name="line-107"></a><a name="DList"></a><span class='hs-comment'>-- ></span>
<a name="line-108"></a><a name="DList"></a><span class='hs-comment'>-- > data Tree a = Leaf a | Branch (Tree a) (Tree a)</span>
<a name="line-109"></a><a name="DList"></a><span class='hs-comment'>-- ></span>
<a name="line-110"></a><a name="DList"></a><span class='hs-comment'>-- > flatten_writer :: Tree x -> DList x</span>
<a name="line-111"></a><a name="DList"></a><span class='hs-comment'>-- > flatten_writer = snd . runWriter . flatten</span>
<a name="line-112"></a><a name="DList"></a><span class='hs-comment'>-- > where</span>
<a name="line-113"></a><a name="DList"></a><span class='hs-comment'>-- > flatten (Leaf x) = tell (singleton x)</span>
<a name="line-114"></a><a name="DList"></a><span class='hs-comment'>-- > flatten (Branch x y) = flatten x >> flatten y</span>
<a name="line-115"></a><a name="DList"></a><span class='hs-comment'>--</span>
<a name="line-116"></a><a name="DList"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DL</span> <span class='hs-layout'>{</span> <span class='hs-varid'>unDL</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-layout'>}</span>
<a name="line-117"></a>
<a name="line-118"></a><a name="fromList"></a><span class='hs-comment'>-- | Convert a list to a dlist</span>
<a name="line-119"></a><span class='hs-definition'>fromList</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-120"></a><span class='hs-definition'>fromList</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DL</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-121"></a><span class='hs-comment'>{-# INLINE fromList #-}</span>
<a name="line-122"></a>
<a name="line-123"></a><a name="toList"></a><span class='hs-comment'>-- | Convert a dlist to a list</span>
<a name="line-124"></a><span class='hs-definition'>toList</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-125"></a><span class='hs-definition'>toList</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unDL</span>
<a name="line-126"></a><span class='hs-comment'>{-# INLINE toList #-}</span>
<a name="line-127"></a>
<a name="line-128"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 708</span>
<a name="line-129"></a><span class='hs-comment'>-- | A unidirectional pattern synonym using 'toList' in a view pattern and</span>
<a name="line-130"></a><span class='hs-comment'>-- matching on @[]@</span>
<a name="line-131"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-132"></a><a name="pattern"></a><span class='hs-definition'>pattern</span> <span class='hs-conid'>Nil</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-133"></a><span class='hs-cpp'>#endif</span>
<a name="line-134"></a><span class='hs-definition'>pattern</span> <span class='hs-conid'>Nil</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-135"></a>
<a name="line-136"></a><span class='hs-comment'>-- | A unidirectional pattern synonym using 'toList' in a view pattern and</span>
<a name="line-137"></a><span class='hs-comment'>-- matching on @x:xs@ such that you have the pattern @Cons x xs@</span>
<a name="line-138"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 710</span>
<a name="line-139"></a><span class='hs-definition'>pattern</span> <span class='hs-conid'>Cons</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-140"></a><span class='hs-cpp'>#endif</span>
<a name="line-141"></a><span class='hs-definition'>pattern</span> <span class='hs-conid'>Cons</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-142"></a><span class='hs-cpp'>#endif</span>
<a name="line-143"></a>
<a name="line-144"></a><a name="apply"></a><span class='hs-comment'>-- | Apply a dlist to a list to get the underlying list with an extension</span>
<a name="line-145"></a><span class='hs-comment'>--</span>
<a name="line-146"></a><span class='hs-comment'>-- > apply (fromList xs) ys = xs ++ ys</span>
<a name="line-147"></a><span class='hs-definition'>apply</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-148"></a><span class='hs-definition'>apply</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unDL</span>
<a name="line-149"></a>
<a name="line-150"></a><a name="empty"></a><span class='hs-comment'>-- | Create a dlist containing no elements</span>
<a name="line-151"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-152"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DL</span> <span class='hs-varid'>id</span>
<a name="line-153"></a><span class='hs-comment'>{-# INLINE empty #-}</span>
<a name="line-154"></a>
<a name="line-155"></a><a name="singleton"></a><span class='hs-comment'>-- | Create dlist with a single element</span>
<a name="line-156"></a><span class='hs-definition'>singleton</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-157"></a><span class='hs-definition'>singleton</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DL</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span>
<a name="line-158"></a><span class='hs-comment'>{-# INLINE singleton #-}</span>
<a name="line-159"></a>
<a name="line-160"></a><span class='hs-comment'>-- | /O(1)/. Prepend a single element to a dlist</span>
<a name="line-161"></a><span class='hs-keyword'>infixr</span> <span class='hs-varop'>`cons`</span>
<a name="line-162"></a><a name="cons"></a><span class='hs-definition'>cons</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-163"></a><span class='hs-definition'>cons</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DL</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unDL</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-164"></a><span class='hs-comment'>{-# INLINE cons #-}</span>
<a name="line-165"></a>
<a name="line-166"></a><span class='hs-comment'>-- | /O(1)/. Append a single element to a dlist</span>
<a name="line-167"></a><span class='hs-keyword'>infixl</span> <span class='hs-varop'>`snoc`</span>
<a name="line-168"></a><a name="snoc"></a><span class='hs-definition'>snoc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-169"></a><span class='hs-definition'>snoc</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DL</span> <span class='hs-layout'>(</span><span class='hs-varid'>unDL</span> <span class='hs-varid'>xs</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-170"></a><span class='hs-comment'>{-# INLINE snoc #-}</span>
<a name="line-171"></a>
<a name="line-172"></a><a name="append"></a><span class='hs-comment'>-- | /O(1)/. Append dlists</span>
<a name="line-173"></a><span class='hs-definition'>append</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-174"></a><span class='hs-definition'>append</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>ys</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DL</span> <span class='hs-layout'>(</span><span class='hs-varid'>unDL</span> <span class='hs-varid'>xs</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unDL</span> <span class='hs-varid'>ys</span><span class='hs-layout'>)</span>
<a name="line-175"></a><span class='hs-comment'>{-# INLINE append #-}</span>
<a name="line-176"></a>
<a name="line-177"></a><a name="concat"></a><span class='hs-comment'>-- | /O(spine)/. Concatenate dlists</span>
<a name="line-178"></a><span class='hs-definition'>concat</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-179"></a><span class='hs-definition'>concat</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>append</span> <span class='hs-varid'>empty</span>
<a name="line-180"></a><span class='hs-comment'>{-# INLINE concat #-}</span>
<a name="line-181"></a>
<a name="line-182"></a><a name="replicate"></a><span class='hs-comment'>-- | /O(n)/. Create a dlist of the given number of elements</span>
<a name="line-183"></a><span class='hs-definition'>replicate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-184"></a><span class='hs-definition'>replicate</span> <span class='hs-varid'>n</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DL</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>let</span> <span class='hs-varid'>go</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>xs</span>
<a name="line-185"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-186"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>go</span> <span class='hs-varid'>n</span>
<a name="line-187"></a><span class='hs-comment'>{-# INLINE replicate #-}</span>
<a name="line-188"></a>
<a name="line-189"></a><a name="list"></a><span class='hs-comment'>-- | /O(n)/. List elimination for dlists</span>
<a name="line-190"></a><span class='hs-definition'>list</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-191"></a><span class='hs-definition'>list</span> <span class='hs-varid'>nill</span> <span class='hs-varid'>consit</span> <span class='hs-varid'>dl</span> <span class='hs-keyglyph'>=</span>
<a name="line-192"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>toList</span> <span class='hs-varid'>dl</span> <span class='hs-keyword'>of</span>
<a name="line-193"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>nill</span>
<a name="line-194"></a> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>consit</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromList</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-195"></a>
<a name="line-196"></a><a name="head"></a><span class='hs-comment'>-- | /O(n)/. Return the head of the dlist</span>
<a name="line-197"></a><span class='hs-definition'>head</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-198"></a><span class='hs-definition'>head</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>list</span> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-str'>"Data.DList.head: empty dlist"</span><span class='hs-layout'>)</span> <span class='hs-varid'>const</span>
<a name="line-199"></a>
<a name="line-200"></a><a name="tail"></a><span class='hs-comment'>-- | /O(n)/. Return the tail of the dlist</span>
<a name="line-201"></a><span class='hs-definition'>tail</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-202"></a><span class='hs-definition'>tail</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>list</span> <span class='hs-layout'>(</span><span class='hs-varid'>error</span> <span class='hs-str'>"Data.DList.tail: empty dlist"</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>flip</span> <span class='hs-varid'>const</span><span class='hs-layout'>)</span>
<a name="line-203"></a>
<a name="line-204"></a><a name="unfoldr"></a><span class='hs-comment'>-- | /O(n)/. Unfoldr for dlists</span>
<a name="line-205"></a><span class='hs-definition'>unfoldr</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span>
<a name="line-206"></a><span class='hs-definition'>unfoldr</span> <span class='hs-varid'>pf</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span>
<a name="line-207"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>pf</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>of</span>
<a name="line-208"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>empty</span>
<a name="line-209"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>cons</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-varid'>unfoldr</span> <span class='hs-varid'>pf</span> <span class='hs-varid'>b'</span><span class='hs-layout'>)</span>
<a name="line-210"></a>
<a name="line-211"></a><a name="foldr"></a><span class='hs-comment'>-- | /O(n)/. Foldr over difference lists</span>
<a name="line-212"></a><span class='hs-definition'>foldr</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-213"></a><span class='hs-definition'>foldr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>b</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-214"></a><span class='hs-comment'>{-# INLINE foldr #-}</span>
<a name="line-215"></a>
<a name="line-216"></a><a name="map"></a><span class='hs-comment'>-- | /O(n)/. Map over difference lists.</span>
<a name="line-217"></a><span class='hs-definition'>map</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DList</span> <span class='hs-varid'>b</span>
<a name="line-218"></a><span class='hs-definition'>map</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varid'>cons</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>empty</span>
<a name="line-219"></a><span class='hs-comment'>{-# INLINE map #-}</span>
<a name="line-220"></a>
<a name="line-221"></a><a name="instance%20Eq%20(DList%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Eq</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-222"></a> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span> <span class='hs-varop'>`on`</span> <span class='hs-varid'>toList</span>
<a name="line-223"></a>
<a name="line-224"></a><a name="instance%20Ord%20(DList%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-225"></a> <span class='hs-varid'>compare</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>compare</span> <span class='hs-varop'>`on`</span> <span class='hs-varid'>toList</span>
<a name="line-226"></a>
<a name="line-227"></a><span class='hs-comment'>-- The Read and Show instances were adapted from Data.Sequence.</span>
<a name="line-228"></a>
<a name="line-229"></a><a name="instance%20Read%20(DList%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Read</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-230"></a><span class='hs-cpp'>#ifdef __GLASGOW_HASKELL__</span>
<a name="line-231"></a> <span class='hs-varid'>readPrec</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parens</span> <span class='hs-varop'>$</span> <span class='hs-varid'>prec</span> <span class='hs-num'>10</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-232"></a> <span class='hs-conid'>Ident</span> <span class='hs-str'>"fromList"</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexP</span>
<a name="line-233"></a> <span class='hs-varid'>dl</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readPrec</span>
<a name="line-234"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromList</span> <span class='hs-varid'>dl</span><span class='hs-layout'>)</span>
<a name="line-235"></a> <span class='hs-varid'>readListPrec</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readListPrecDefault</span>
<a name="line-236"></a><span class='hs-cpp'>#else</span>
<a name="line-237"></a> <span class='hs-varid'>readsPrec</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readParen</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varop'>></span> <span class='hs-num'>10</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-238"></a> <span class='hs-layout'>(</span><span class='hs-str'>"fromList"</span><span class='hs-layout'>,</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lex</span> <span class='hs-varid'>r</span>
<a name="line-239"></a> <span class='hs-layout'>(</span><span class='hs-varid'>dl</span><span class='hs-layout'>,</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>reads</span> <span class='hs-varid'>s</span>
<a name="line-240"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromList</span> <span class='hs-varid'>dl</span><span class='hs-layout'>,</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-241"></a><span class='hs-cpp'>#endif</span>
<a name="line-242"></a>
<a name="line-243"></a><a name="instance%20Show%20(DList%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Show</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-244"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>p</span> <span class='hs-varid'>dl</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showParen</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varop'>></span> <span class='hs-num'>10</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-245"></a> <span class='hs-varid'>showString</span> <span class='hs-str'>"fromList "</span> <span class='hs-varop'>.</span> <span class='hs-varid'>shows</span> <span class='hs-layout'>(</span><span class='hs-varid'>toList</span> <span class='hs-varid'>dl</span><span class='hs-layout'>)</span>
<a name="line-246"></a>
<a name="line-247"></a><a name="instance%20Monoid%20(DList%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-248"></a> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-249"></a> <span class='hs-varid'>mappend</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>append</span>
<a name="line-250"></a>
<a name="line-251"></a><a name="instance%20Functor%20DList"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-conid'>DList</span> <span class='hs-keyword'>where</span>
<a name="line-252"></a> <span class='hs-varid'>fmap</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span>
<a name="line-253"></a> <span class='hs-comment'>{-# INLINE fmap #-}</span>
<a name="line-254"></a>
<a name="line-255"></a><a name="instance%20Applicative%20DList"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Applicative</span> <span class='hs-conid'>DList</span> <span class='hs-keyword'>where</span>
<a name="line-256"></a> <span class='hs-varid'>pure</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>singleton</span>
<a name="line-257"></a> <span class='hs-comment'>{-# INLINE pure #-}</span>
<a name="line-258"></a> <span class='hs-layout'>(</span><span class='hs-varop'><*></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ap</span>
<a name="line-259"></a>
<a name="line-260"></a><a name="instance%20Alternative%20DList"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Alternative</span> <span class='hs-conid'>DList</span> <span class='hs-keyword'>where</span>
<a name="line-261"></a> <span class='hs-varid'>empty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-262"></a> <span class='hs-layout'>(</span><span class='hs-varop'><|></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>append</span>
<a name="line-263"></a>
<a name="line-264"></a><a name="instance%20Monad%20DList"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-conid'>DList</span> <span class='hs-keyword'>where</span>
<a name="line-265"></a> <span class='hs-varid'>m</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>k</span>
<a name="line-266"></a> <span class='hs-comment'>-- = concat (toList (fmap k m))</span>
<a name="line-267"></a> <span class='hs-comment'>-- = (concat . toList . fromList . List.map k . toList) m</span>
<a name="line-268"></a> <span class='hs-comment'>-- = concat . List.map k . toList $ m</span>
<a name="line-269"></a> <span class='hs-comment'>-- = List.foldr append empty . List.map k . toList $ m</span>
<a name="line-270"></a> <span class='hs-comment'>-- = List.foldr (append . k) empty . toList $ m</span>
<a name="line-271"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varid'>append</span> <span class='hs-varop'>.</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span> <span class='hs-varid'>empty</span> <span class='hs-varid'>m</span>
<a name="line-272"></a> <span class='hs-comment'>{-# INLINE (>>=) #-}</span>
<a name="line-273"></a>
<a name="line-274"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pure</span>
<a name="line-275"></a> <span class='hs-comment'>{-# INLINE return #-}</span>
<a name="line-276"></a>
<a name="line-277"></a> <span class='hs-varid'>fail</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-278"></a> <span class='hs-comment'>{-# INLINE fail #-}</span>
<a name="line-279"></a>
<a name="line-280"></a><a name="instance%20MonadPlus%20DList"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>MonadPlus</span> <span class='hs-conid'>DList</span> <span class='hs-keyword'>where</span>
<a name="line-281"></a> <span class='hs-varid'>mzero</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-282"></a> <span class='hs-varid'>mplus</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>append</span>
<a name="line-283"></a>
<a name="line-284"></a><a name="instance%20Foldable%20DList"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Foldable</span> <span class='hs-conid'>DList</span> <span class='hs-keyword'>where</span>
<a name="line-285"></a> <span class='hs-varid'>fold</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mconcat</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-286"></a> <span class='hs-comment'>{-# INLINE fold #-}</span>
<a name="line-287"></a>
<a name="line-288"></a> <span class='hs-varid'>foldMap</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>F</span><span class='hs-varop'>.</span><span class='hs-varid'>foldMap</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-289"></a> <span class='hs-comment'>{-# INLINE foldMap #-}</span>
<a name="line-290"></a>
<a name="line-291"></a> <span class='hs-varid'>foldr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-292"></a> <span class='hs-comment'>{-# INLINE foldr #-}</span>
<a name="line-293"></a>
<a name="line-294"></a> <span class='hs-varid'>foldl</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-295"></a> <span class='hs-comment'>{-# INLINE foldl #-}</span>
<a name="line-296"></a>
<a name="line-297"></a> <span class='hs-varid'>foldr1</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr1</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-298"></a> <span class='hs-comment'>{-# INLINE foldr1 #-}</span>
<a name="line-299"></a>
<a name="line-300"></a> <span class='hs-varid'>foldl1</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl1</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-301"></a> <span class='hs-comment'>{-# INLINE foldl1 #-}</span>
<a name="line-302"></a>
<a name="line-303"></a><span class='hs-comment'>-- CPP: foldl', foldr' added to Foldable in 7.6.1</span>
<a name="line-304"></a><span class='hs-comment'>-- <a href="http://www.haskell.org/ghc/docs/7.6.1/html/users_guide/release-7-6-1.html">http://www.haskell.org/ghc/docs/7.6.1/html/users_guide/release-7-6-1.html</a></span>
<a name="line-305"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 706</span>
<a name="line-306"></a> <span class='hs-varid'>foldl'</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>List</span><span class='hs-varop'>.</span><span class='hs-varid'>foldl'</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-307"></a> <span class='hs-comment'>{-# INLINE foldl' #-}</span>
<a name="line-308"></a>
<a name="line-309"></a> <span class='hs-varid'>foldr'</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>F</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr'</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-310"></a> <span class='hs-comment'>{-# INLINE foldr' #-}</span>
<a name="line-311"></a><span class='hs-cpp'>#endif</span>
<a name="line-312"></a>
<a name="line-313"></a><a name="instance%20NFData%20(DList%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>NFData</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>NFData</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-314"></a> <span class='hs-varid'>rnf</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rnf</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toList</span>
<a name="line-315"></a> <span class='hs-comment'>{-# INLINE rnf #-}</span>
<a name="line-316"></a>
<a name="line-317"></a><a name="instance%20IsString%20(DList%20a)"></a><span class='hs-comment'>-- This is _not_ a flexible instance to allow certain uses of overloaded</span>
<a name="line-318"></a><a name="instance%20IsString%20(DList%20a)"></a><span class='hs-comment'>-- strings. See tests/OverloadedStrings.hs for an example and</span>
<a name="line-319"></a><a name="instance%20IsString%20(DList%20a)"></a><span class='hs-comment'>-- https://git.haskell.org/ghc.git/commitdiff/b225b234a6b11e42fef433dcd5d2a38bb4b466bf</span>
<a name="line-320"></a><a name="instance%20IsString%20(DList%20a)"></a><span class='hs-comment'>-- for the same change made to the IsString instance for lists.</span>
<a name="line-321"></a><a name="instance%20IsString%20(DList%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>IsString</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-322"></a> <span class='hs-varid'>fromString</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromList</span>
<a name="line-323"></a> <span class='hs-comment'>{-# INLINE fromString #-}</span>
<a name="line-324"></a>
<a name="line-325"></a><span class='hs-cpp'>#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 708</span>
<a name="line-326"></a><a name="instance%20IsList%20(DList%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>IsList</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-327"></a> <span class='hs-keyword'>type</span> <span class='hs-conid'>Item</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-328"></a> <span class='hs-varid'>fromList</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromList</span>
<a name="line-329"></a> <span class='hs-comment'>{-# INLINE fromList #-}</span>
<a name="line-330"></a> <span class='hs-varid'>toList</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toList</span>
<a name="line-331"></a> <span class='hs-comment'>{-# INLINE toList #-}</span>
<a name="line-332"></a><span class='hs-cpp'>#endif</span>
<a name="line-333"></a>
<a name="line-334"></a><span class='hs-cpp'>#if MIN_VERSION_base(4,9,0)</span>
<a name="line-335"></a><a name="instance%20Semigroup%20(DList%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Semigroup</span> <span class='hs-layout'>(</span><span class='hs-conid'>DList</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-336"></a> <span class='hs-layout'>(</span><span class='hs-varop'><></span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>append</span>
<a name="line-337"></a> <span class='hs-comment'>{-# INLINE (<>) #-}</span>
<a name="line-338"></a> <span class='hs-varid'>stimes</span> <span class='hs-varid'>n</span> <span class='hs-varid'>x</span>
<a name="line-339"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-str'>"Data.DList.stimes: negative multiplier"</span>
<a name="line-340"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rep</span> <span class='hs-varid'>n</span>
<a name="line-341"></a> <span class='hs-keyword'>where</span>
<a name="line-342"></a> <span class='hs-varid'>rep</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-343"></a> <span class='hs-varid'>rep</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'><></span> <span class='hs-varid'>rep</span> <span class='hs-layout'>(</span><span class='hs-varid'>pred</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span>
<a name="line-344"></a><span class='hs-cpp'>#endif</span>
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