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A linked list in an inconsistent state, caused by application of the naive lock-free deletion algorithm. Dotted lines are links that exist in intermediate states; solid lines represent the final state. Deletion of the node holding a has executed simultaneously with insertion of b after a, causing the insertion to be undone.
The first and last nodes of a doubly linked list for all practical applications are immediately accessible (i.e., accessible without traversal, and usually called head and tail) and therefore allow traversal of the list from the beginning or end of the list, respectively: e.g., traversing the list from beginning to end, or from end to beginning, in a search of the list for a node with specific ...
In a doubly linked list, one can insert or delete a node in a constant number of operations given only that node's address. To do the same in a singly linked list, one must have the address of the pointer to that node, which is either the handle for the whole list (in case of the first node) or the link field in the previous node. Some ...
To link to a section within the same article, one can simply prefix the name of the section header with the pound sign ("#") nested in square brackets, for example ("#"): [[#Promotion to rook or bishop|§ promotion to a rook or bishop]]. Prefix the label of a wikilink that targets a section header with the section symbol ("§").
Grammars of this type can match anything that can be matched by a regular grammar, and furthermore, can handle the concept of recursive "nesting" ("every A is eventually followed by a matching B"), such as the question of whether a given string contains correctly nested parentheses. The rules of Context-free grammars are purely local, however ...
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This is used to see a list of the pages that link to (or redirect to, or transclude) the current page. These are sometimes referred to as backlinks. It is possible to make a wikilink to the "What links here" list for a particular page; to do this type [[Special:WhatLinksHere/Page name]], replacing Page name with the title of the target page ...
Both of these make unrolled linked lists more attractive. Because unrolled linked list nodes each store a count next to the next field, retrieving the kth element of an unrolled linked list (indexing) can be done in n/m + 1 cache misses, up to a factor of m better than ordinary linked lists. Additionally, if the size of each element is small ...