ucx: src/ucx/list.h@deb0035635eb (annotated)

src/ucx/list.h@deb0035635eb (annotated)

src/ucx/list.h

Fri, 11 May 2018 17:40:16 +0200

author: Mike Becker <universe@uap-core.de>
date: Fri, 11 May 2018 17:40:16 +0200
changeset 291: deb0035635eb
parent 277: f819fe5e20f5
child 293: d994325445f1
permissions: -rw-r--r--

adds ucx_list_prepend_once() and ucx_list_prepend_once_a()

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright
  *      notice, this list of conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright
  *      notice, this list of conditions and the following disclaimer in the
  *      documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
 /**
  * Doubly linked list implementation.
  *
  * @file   list.h
  * @author Mike Becker
  * @author Olaf Wintermann
  */
 #ifndef UCX_LIST_H
 #define	UCX_LIST_H
 #include "ucx.h"
 #include "allocator.h"
 #ifdef	__cplusplus
 extern "C" {
 #endif
 /**
  * Loop statement for UCX lists.
  *
  * The first argument is the name of the iteration variable. The scope of
  * this variable is limited to the <code>UCX_FOREACH</code> statement.
  *
  * The second argument is a pointer to the list. In most cases this will be the
  * pointer to the first element of the list, but it may also be an arbitrary
  * element of the list. The iteration will then start with that element.
  *
  * @param list The first element of the list
  * @param elem The variable name of the element
  */
 #define UCX_FOREACH(elem,list) \
         for (UcxList* elem = list ; elem != NULL ; elem = elem->next)
 /**
  * UCX list type.
  * @see UcxList
  */
 typedef struct UcxList UcxList;
 /**
  * UCX list structure.
  */
 struct UcxList {
     /**
      * List element payload.
      */
     void    *data;
     /**
      * Pointer to the next list element or <code>NULL</code>, if this is the
      * last element.
      */
     UcxList *next;
     /**
      * Pointer to the previous list element or <code>NULL</code>, if this is
      * the first element.
      */
     UcxList *prev;
 };
 /**
  * Creates an element-wise copy of a list.
  *
  * This function clones the specified list by creating new list elements and
  * copying the data with the specified copy_func(). If no copy_func() is
  * specified, a shallow copy is created and the new list will reference the
  * same data as the source list.
  *
  * @param list the list to copy
  * @param cpyfnc a pointer to the function that shall copy an element (may be
  * <code>NULL</code>)
  * @param data additional data for the copy_func()
  * @return a pointer to the copy
  */
 UcxList *ucx_list_clone(UcxList *list, copy_func cpyfnc, void* data);
 /**
  * Creates an element-wise copy of a list using a UcxAllocator.
  *
  * See ucx_list_clone() for details.
  *
  * You might want to pass the allocator via the <code>data</code> parameter,
  * to access it within the copy function for making deep copies.
  *
  * @param allocator the allocator to use
  * @param list the list to copy
  * @param cpyfnc a pointer to the function that shall copy an element (may be
  * <code>NULL</code>)
  * @param data additional data for the copy_func()
  * @return a pointer to the copy
  * @see ucx_list_clone()
  */
 UcxList *ucx_list_clone_a(UcxAllocator *allocator, UcxList *list,
         copy_func cpyfnc, void* data);
 /**
  * Compares two UCX lists element-wise by using a compare function.
  *
  * Each element of the two specified lists are compared by using the specified
  * compare function and the additional data. The type and content of this
  * additional data depends on the cmp_func() used.
  *
  * If the list pointers denote elements within a list, the lists are compared
  * starting with the denoted elements. Thus any previous elements are not taken
  * into account. This might be useful to check, if certain list tails match
  * each other.
  *
  * @param list1 the first list
  * @param list2 the second list
  * @param cmpfnc the compare function
  * @param data additional data for the compare function
  * @return 1, if and only if the two lists equal element-wise, 0 otherwise
  */
 int ucx_list_equals(const UcxList *list1, const UcxList *list2,
         cmp_func cmpfnc, void* data);
 /**
  * Destroys the entire list.
  *
  * The members of the list are not automatically freed, so ensure they are
  * otherwise referenced or destroyed by ucx_list_free_contents().
  * Otherwise, a memory leak is likely to occur.
  *
  * <b>Caution:</b> the argument <b>MUST</b> denote an entire list (i.e. a call
  * to ucx_list_first() on the argument must return the argument itself)
  *
  * @param list the list to free
  * @see ucx_list_free_contents()
  */
 void ucx_list_free(UcxList *list);
 /**
  * Destroys the entire list using a UcxAllocator.
  *
  * See ucx_list_free() for details.
  *
  * @param allocator the allocator to use
  * @param list the list to free
  * @see ucx_list_free()
  */
 void ucx_list_free_a(UcxAllocator *allocator, UcxList *list);
 /**
  * Destroys the contents of the specified list by calling the specified
  * destructor on each of them.
  *
  * Note, that the contents are not usable afterwards and the list should be
  * destroyed with ucx_list_free().
  *
  * If no destructor is specified (<code>NULL</code>), stdlib's free() is used.
  *
  * @param list the list for which the contents shall be freed
  * @param destr optional destructor function
  * @see ucx_list_free()
  */
 void ucx_list_free_content(UcxList* list, ucx_destructor destr);
 /**
  * Inserts an element at the end of the list.
  *
  * This is generally an O(n) operation, as the end of the list is retrieved with
  * ucx_list_last().
  *
  * @param list the list where to append the data, or <code>NULL</code> to
  * create a new list
  * @param data the data to insert
  * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to
  * the newly created list otherwise
  */
 UcxList *ucx_list_append(UcxList *list, void *data);
 /**
  * Inserts an element at the end of the list using a UcxAllocator.
  *
  * See ucx_list_append() for details.
  *
  * @param allocator the allocator to use
  * @param list the list where to append the data, or <code>NULL</code> to
  * create a new list
  * @param data the data to insert
  * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to
  * the newly created list otherwise
  * @see ucx_list_append()
  */
 UcxList *ucx_list_append_a(UcxAllocator *allocator, UcxList *list, void *data);
 /**
  * Inserts an element at the end of the list, if it is not present in the list.
  *
  *
  * @param list the list where to append the data, or <code>NULL</code> to
  * create a new list
  * @param data the data to insert
  * @param cmpfnc the compare function
  * @param cmpdata additional data for the compare function
  * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to
  * the newly created list otherwise
  * @see ucx_list_append()
  */
 UcxList *ucx_list_append_once(UcxList *list, void *data,
         cmp_func cmpfnc, void *cmpdata);
 /**
  * Inserts an element at the end of the list, if it is not present in the list,
  * using a UcxAllocator.
  *
  * @param allocator the allocator to use
  * @param list the list where to append the data, or <code>NULL</code> to
  * create a new list
  * @param data the data to insert
  * @param cmpfnc the compare function
  * @param cmpdata additional data for the compare function
  * @return <code>list</code>, if it is not <code>NULL</code> or a pointer to
  * the newly created list otherwise
  * @see ucx_list_append_a()
  */
 UcxList *ucx_list_append_once_a(UcxAllocator *allocator,
         UcxList *list, void *data, cmp_func cmpfnc, void *cmpdata);
 /**
  * Inserts an element at the beginning of the list, if it is not present
  * in the list.
  *
  *
  * @param list the list where to prepend the data, or <code>NULL</code> to
  * create a new list
  * @param data the data to insert
  * @param cmpfnc the compare function
  * @param cmpdata additional data for the compare function
  * @return a pointer to the new list head
  * @see ucx_list_prepend()
  */
 UcxList *ucx_list_prepend_once(UcxList *list, void *data,
         cmp_func cmpfnc, void *cmpdata);
 /**
  * Inserts an element at the beginning of the list, if it is not present in
  * the list, using a UcxAllocator.
  *
  * @param allocator the allocator to use
  * @param list the list where to prepend the data, or <code>NULL</code> to
  * create a new list
  * @param data the data to insert
  * @param cmpfnc the compare function
  * @param cmpdata additional data for the compare function
  * @return a pointer to the new list head
  * @see ucx_list_prepend_a()
  */
 UcxList *ucx_list_prepend_once_a(UcxAllocator *allocator,
         UcxList *list, void *data, cmp_func cmpfnc, void *cmpdata);
 /**
  * Inserts an element at the beginning of the list.
  *
  * You <i>should</i> overwrite the old list pointer by calling
  * <code>mylist = ucx_list_prepend(mylist, mydata);</code>. However, you may
  * also perform successive calls of ucx_list_prepend() on the same list pointer,
  * as this function always searchs for the head of the list with
  * ucx_list_first().
  *
  * @param list the list where to insert the data or <code>NULL</code> to create
  * a new list
  * @param data the data to insert
  * @return a pointer to the new list head
  */
 UcxList *ucx_list_prepend(UcxList *list, void *data);
 /**
  * Inserts an element at the beginning of the list using a UcxAllocator.
  *
  * See ucx_list_prepend() for details.
  *
  * @param allocator the allocator to use
  * @param list the list where to insert the data or <code>NULL</code> to create
  * a new list
  * @param data the data to insert
  * @return a pointer to the new list head
  * @see ucx_list_prepend()
  */
 UcxList *ucx_list_prepend_a(UcxAllocator *allocator, UcxList *list, void *data);
 /**
  * Concatenates two lists.
  *
  * Either of the two arguments may be <code>NULL</code>.
  *
  * This function modifies the references to the next/previous element of
  * the last/first element of <code>list1</code>/<code>
  * list2</code>.
  *
  * @param list1 first list
  * @param list2 second list
  * @return if <code>list1</code> is <code>NULL</code>, <code>list2</code> is
  * returned, otherwise <code>list1</code> is returned
  */
 UcxList *ucx_list_concat(UcxList *list1, UcxList *list2);
 /**
  * Returns the first element of a list.
  *
  * If the argument is the list pointer, it is directly returned. Otherwise
  * this function traverses to the first element of the list and returns the
  * list pointer.
  *
  * @param elem one element of the list
  * @return the first element of the list, the specified element is a member of
  */
 UcxList *ucx_list_first(const UcxList *elem);
 /**
  * Returns the last element of a list.
  *
  * If the argument has no successor, it is the last element and therefore
  * directly returned. Otherwise this function traverses to the last element of
  * the list and returns it.
  *
  * @param elem one element of the list
  * @return the last element of the list, the specified element is a member of
  */
 UcxList *ucx_list_last(const UcxList *elem);
 /**
  * Returns the list element at the specified index.
  *
  * @param list the list to retrieve the element from
  * @param index index of the element to return
  * @return the element at the specified index or <code>NULL</code>, if the
  * index is greater than the list size
  */
 UcxList *ucx_list_get(const UcxList *list, size_t index);
 /**
  * Returns the index of an element.
  *
  * @param list the list where to search for the element
  * @param elem the element to find
  * @return the index of the element or -1 if the list does not contain the
  * element
  */
 ssize_t ucx_list_indexof(const UcxList *list, const UcxList *elem);
 /**
  * Returns the element count of the list.
  *
  * @param list the list whose elements are counted
  * @return the element count
  */
 size_t ucx_list_size(const UcxList *list);
 /**
  * Returns the index of an element containing the specified data.
  *
  * This function uses a cmp_func() to compare the data of each list element
  * with the specified data. If no cmp_func is provided, the pointers are
  * compared.
  *
  * If the list contains the data more than once, the index of the first
  * occurrence is returned.
  *
  * @param list the list where to search for the data
  * @param elem the element data
  * @param cmpfnc the compare function
  * @param data additional data for the compare function
  * @return the index of the element containing the specified data or -1 if the
  * data is not found in this list
  */
 ssize_t ucx_list_find(UcxList *list, void *elem, cmp_func cmpfnc, void *data);
 /**
  * Checks, if a list contains a specific element.
  *
  * An element is found, if ucx_list_find() returns a value greater than -1.
  *
  * @param list the list where to search for the data
  * @param elem the element data
  * @param cmpfnc the compare function
  * @param data additional data for the compare function
  * @return 1, if and only if the list contains the specified element data
  * @see ucx_list_find()
  */
 int ucx_list_contains(UcxList *list, void *elem, cmp_func cmpfnc, void *data);
 /**
  * Sorts a UcxList with natural merge sort.
  *
  * This function uses O(n) additional temporary memory for merge operations
  * that is automatically freed after each merge.
  *
  * As the head of the list might change, you <b>MUST</b> call this function
  * as follows: <code>mylist = ucx_list_sort(mylist, mycmpfnc, mydata);</code>.
  *
  * @param list the list to sort
  * @param cmpfnc the function that shall be used to compare the element data
  * @param data additional data for the cmp_func()
  * @return the sorted list
  */
 UcxList *ucx_list_sort(UcxList *list, cmp_func cmpfnc, void *data);
 /**
  * Removes an element from the list.
  *
  * If the first element is removed, the list pointer changes. So it is
  * <i>highly recommended</i> to <i>always</i> update the pointer by calling
  * <code>mylist = ucx_list_remove(mylist, myelem);</code>.
  *
  * @param list the list from which the element shall be removed
  * @param element the element to remove
  * @return returns the updated list pointer or <code>NULL</code>, if the list
  * is now empty
  */
 UcxList *ucx_list_remove(UcxList *list, UcxList *element);
 /**
  * Removes an element from the list using a UcxAllocator.
  *
  * See ucx_list_remove() for details.
  *
  * @param allocator the allocator to use
  * @param list the list from which the element shall be removed
  * @param element the element to remove
  * @return returns the updated list pointer or <code>NULL</code>, if the list
  * @see ucx_list_remove()
  */
 UcxList *ucx_list_remove_a(UcxAllocator *allocator, UcxList *list,
         UcxList *element);
 #ifdef	__cplusplus
 }
 #endif
 #endif	/* UCX_LIST_H */

Mercurial > hg > ucx / annotate

src/ucx/list.h@deb0035635eb (annotated)

src/ucx/list.h