ZLISTX(3)

NAME
zlistx - Class for extended generic list container

SYNOPSIS

//  This is a stable class, and may not change except for emergencies. It
//  is provided in stable builds.
//  This class has draft methods, which may change over time. They are not
//  in stable releases, by default. Use --enable-drafts to enable.
// Destroy an item
typedef void (zlistx_destructor_fn) (
    void **item);
// Duplicate an item
typedef void * (zlistx_duplicator_fn) (
    const void *item);
// Compare two items, for sorting
typedef int (zlistx_comparator_fn) (
    const void *item1, const void *item2);
//  Create a new, empty list.
CZMQ_EXPORT zlistx_t *
    zlistx_new (void);
//  Destroy a list. If an item destructor was specified, all items in the
//  list are automatically destroyed as well.
CZMQ_EXPORT void
    zlistx_destroy (zlistx_t **self_p);
//  Add an item to the head of the list. Calls the item duplicator, if any,
//  on the item. Resets cursor to list head. Returns an item handle on
//  success, NULL if memory was exhausted.
CZMQ_EXPORT void *
    zlistx_add_start (zlistx_t *self, void *item);
//  Add an item to the tail of the list. Calls the item duplicator, if any,
//  on the item. Resets cursor to list head. Returns an item handle on
//  success, NULL if memory was exhausted.
CZMQ_EXPORT void *
    zlistx_add_end (zlistx_t *self, void *item);
//  Return the number of items in the list
CZMQ_EXPORT size_t
    zlistx_size (zlistx_t *self);
//  Return first item in the list, or null, leaves the cursor
CZMQ_EXPORT void *
    zlistx_head (zlistx_t *self);
//  Return last item in the list, or null, leaves the cursor
CZMQ_EXPORT void *
    zlistx_tail (zlistx_t *self);
//  Return the item at the head of list. If the list is empty, returns NULL.
//  Leaves cursor pointing at the head item, or NULL if the list is empty.
CZMQ_EXPORT void *
    zlistx_first (zlistx_t *self);
//  Return the next item. At the end of the list (or in an empty list),
//  returns NULL. Use repeated zlistx_next () calls to work through the list
//  from zlistx_first (). First time, acts as zlistx_first().
CZMQ_EXPORT void *
    zlistx_next (zlistx_t *self);
//  Return the previous item. At the start of the list (or in an empty list),
//  returns NULL. Use repeated zlistx_prev () calls to work through the list
//  backwards from zlistx_last (). First time, acts as zlistx_last().
CZMQ_EXPORT void *
    zlistx_prev (zlistx_t *self);
//  Return the item at the tail of list. If the list is empty, returns NULL.
//  Leaves cursor pointing at the tail item, or NULL if the list is empty.
CZMQ_EXPORT void *
    zlistx_last (zlistx_t *self);
//  Returns the value of the item at the cursor, or NULL if the cursor is
//  not pointing to an item.
CZMQ_EXPORT void *
    zlistx_item (zlistx_t *self);
//  Returns the handle of the item at the cursor, or NULL if the cursor is
//  not pointing to an item.
CZMQ_EXPORT void *
    zlistx_cursor (zlistx_t *self);
//  Returns the item associated with the given list handle, or NULL if passed
//  in handle is NULL. Asserts that the passed in handle points to a list element.
CZMQ_EXPORT void *
    zlistx_handle_item (void *handle);
//  Find an item in the list, searching from the start. Uses the item
//  comparator, if any, else compares item values directly. Returns the
//  item handle found, or NULL. Sets the cursor to the found item, if any.
CZMQ_EXPORT void *
    zlistx_find (zlistx_t *self, void *item);
//  Detach an item from the list, using its handle. The item is not modified,
//  and the caller is responsible for destroying it if necessary. If handle is
//  null, detaches the first item on the list. Returns item that was detached,
//  or null if none was. If cursor was at item, moves cursor to previous item,
//  so you can detach items while iterating forwards through a list.
CZMQ_EXPORT void *
    zlistx_detach (zlistx_t *self, void *handle);
//  Detach item at the cursor, if any, from the list. The item is not modified,
//  and the caller is responsible for destroying it as necessary. Returns item
//  that was detached, or null if none was. Moves cursor to previous item, so
//  you can detach items while iterating forwards through a list.
CZMQ_EXPORT void *
    zlistx_detach_cur (zlistx_t *self);
//  Delete an item, using its handle. Calls the item destructor if any is
//  set. If handle is null, deletes the first item on the list. Returns 0
//  if an item was deleted, -1 if not. If cursor was at item, moves cursor
//  to previous item, so you can delete items while iterating forwards
//  through a list.
CZMQ_EXPORT int
    zlistx_delete (zlistx_t *self, void *handle);
//  Move an item to the start of the list, via its handle.
CZMQ_EXPORT void
    zlistx_move_start (zlistx_t *self, void *handle);
//  Move an item to the end of the list, via its handle.
CZMQ_EXPORT void
    zlistx_move_end (zlistx_t *self, void *handle);
//  Remove all items from the list, and destroy them if the item destructor
//  is set.
CZMQ_EXPORT void
    zlistx_purge (zlistx_t *self);
//  Sort the list. If an item comparator was set, calls that to compare
//  items, otherwise compares on item value. The sort is not stable, so may
//  reorder equal items.
CZMQ_EXPORT void
    zlistx_sort (zlistx_t *self);
//  Create a new node and insert it into a sorted list. Calls the item
//  duplicator, if any, on the item. If low_value is true, starts searching
//  from the start of the list, otherwise searches from the end. Use the item
//  comparator, if any, to find where to place the new node. Returns a handle
//  to the new node, or NULL if memory was exhausted. Resets the cursor to the
//  list head.
CZMQ_EXPORT void *
    zlistx_insert (zlistx_t *self, void *item, bool low_value);
//  Move an item, specified by handle, into position in a sorted list. Uses
//  the item comparator, if any, to determine the new location. If low_value
//  is true, starts searching from the start of the list, otherwise searches
//  from the end.
CZMQ_EXPORT void
    zlistx_reorder (zlistx_t *self, void *handle, bool low_value);
//  Make a copy of the list; items are duplicated if you set a duplicator
//  for the list, otherwise not. Copying a null reference returns a null
//  reference.
CZMQ_EXPORT zlistx_t *
    zlistx_dup (zlistx_t *self);
//  Set a user-defined deallocator for list items; by default items are not
//  freed when the list is destroyed.
CZMQ_EXPORT void
    zlistx_set_destructor (zlistx_t *self, zlistx_destructor_fn destructor);
//  Set a user-defined duplicator for list items; by default items are not
//  copied when the list is duplicated.
CZMQ_EXPORT void
    zlistx_set_duplicator (zlistx_t *self, zlistx_duplicator_fn duplicator);
//  Set a user-defined comparator for zlistx_find and zlistx_sort; the method
//  must return -1, 0, or 1 depending on whether item1 is less than, equal to,
//  or greater than, item2.
CZMQ_EXPORT void
    zlistx_set_comparator (zlistx_t *self, zlistx_comparator_fn comparator);
//  Self test of this class.
CZMQ_EXPORT void
    zlistx_test (bool verbose);
#ifdef CZMQ_BUILD_DRAFT_API
//  *** Draft method, for development use, may change without warning ***
//  Unpack binary frame into a new list. Packed data must follow format
//  defined by zlistx_pack. List is set to autofree. An empty frame
//  unpacks to an empty list.
CZMQ_EXPORT zlistx_t *
    zlistx_unpack (zframe_t *frame);
//  *** Draft method, for development use, may change without warning ***
//  Serialize list to a binary frame that can be sent in a message.
//  The packed format is compatible with the 'strings' type implemented by zproto:
//
//     ; A list of strings
//     list            = list-count *longstr
//     list-count      = number-4
//
//     ; Strings are always length + text contents
//     longstr         = number-4 *VCHAR
//
//     ; Numbers are unsigned integers in network byte order
//     number-4        = 4OCTET
//  Caller owns return value and must destroy it when done.
CZMQ_EXPORT zframe_t *
    zlistx_pack (zlistx_t *self);
#endif // CZMQ_BUILD_DRAFT_API
Please add '@interface' section in '/home/builder/.termux-build/libczmq/src/doc/../src/zlistx.c'.

DESCRIPTION

Provides a generic doubly-linked list container. This container provides hooks for duplicator, comparator, and destructor functions. These tie into CZMQ and standard C semantics, so e.g. for string items you can use strdup, strcmp, and zstr_free. To store custom objects, define your own duplicator and comparator, and use the standard object destructor.

This is a reworking of the simpler zlist container. It is faster to insert and delete items anywhere in the list, and to keep ordered lists.

EXAMPLE

From zlistx_test method.

    zlistx_t *list = zlistx_new ();
    assert (list);
    assert (zlistx_size (list) == 0);
    //  Test operations on an empty list
    assert (zlistx_head (list) == NULL);
    assert (zlistx_first (list) == NULL);
    assert (zlistx_last (list) == NULL);
    assert (zlistx_next (list) == NULL);
    assert (zlistx_prev (list) == NULL);
    assert (zlistx_find (list, "hello") == NULL);
    assert (zlistx_delete (list, NULL) == -1);
    assert (zlistx_detach (list, NULL) == NULL);
    assert (zlistx_delete (list, NULL) == -1);
    assert (zlistx_detach (list, NULL) == NULL);
    zlistx_purge (list);
    zlistx_sort (list);
    //  Use item handlers
    zlistx_set_destructor (list, (zlistx_destructor_fn *) zstr_free);
    zlistx_set_duplicator (list, (zlistx_duplicator_fn *) strdup);
    zlistx_set_comparator (list, (zlistx_comparator_fn *) strcmp);
    //  Try simple insert/sort/delete/next
    assert (zlistx_next (list) == NULL);
    zlistx_add_end (list, "world");
    assert (streq ((char *) zlistx_next (list), "world"));
    assert (streq ((char *) zlistx_head (list), "world"));
    zlistx_add_end (list, "hello");
    assert (streq ((char *) zlistx_prev (list), "hello"));
    zlistx_sort (list);
    assert (zlistx_size (list) == 2);
    void *handle = zlistx_find (list, "hello");
    char *item1 = (char *) zlistx_item (list);
    char *item2 = (char *) zlistx_handle_item (handle);
    assert (item1 == item2);
    assert (streq (item1, "hello"));
    zlistx_delete (list, handle);
    assert (zlistx_size (list) == 1);
    char *string = (char *) zlistx_detach (list, NULL);
    assert (streq (string, "world"));
    freen (string);
    assert (zlistx_size (list) == 0);
    //  Check next/back work
    //  Now populate the list with items
    zlistx_add_start (list, "five");
    zlistx_add_end   (list, "six");
    zlistx_add_start (list, "four");
    zlistx_add_end   (list, "seven");
    zlistx_add_start (list, "three");
    zlistx_add_end   (list, "eight");
    zlistx_add_start (list, "two");
    zlistx_add_end   (list, "nine");
    zlistx_add_start (list, "one");
    zlistx_add_end   (list, "ten");
    //  Test our navigation skills
    assert (zlistx_size (list) == 10);
    assert (streq ((char *) zlistx_last (list), "ten"));
    assert (streq ((char *) zlistx_prev (list), "nine"));
    assert (streq ((char *) zlistx_prev (list), "eight"));
    assert (streq ((char *) zlistx_prev (list), "seven"));
    assert (streq ((char *) zlistx_prev (list), "six"));
    assert (streq ((char *) zlistx_prev (list), "five"));
    assert (streq ((char *) zlistx_first (list), "one"));
    assert (streq ((char *) zlistx_next (list), "two"));
    assert (streq ((char *) zlistx_next (list), "three"));
    assert (streq ((char *) zlistx_next (list), "four"));
    //  Sort by alphabetical order
    zlistx_sort (list);
    assert (streq ((char *) zlistx_first (list), "eight"));
    assert (streq ((char *) zlistx_last (list), "two"));
    //  Moving items around
    handle = zlistx_find (list, "six");
    zlistx_move_start (list, handle);
    assert (streq ((char *) zlistx_first (list), "six"));
    zlistx_move_end (list, handle);
    assert (streq ((char *) zlistx_last (list), "six"));
    zlistx_sort (list);
    assert (streq ((char *) zlistx_last (list), "two"));
    //  Copying a list
    zlistx_t *copy = zlistx_dup (list);
    assert (copy);
    assert (zlistx_size (copy) == 10);
    assert (streq ((char *) zlistx_first (copy), "eight"));
    assert (streq ((char *) zlistx_last (copy), "two"));
    zlistx_destroy (&copy);
    //  Delete items while iterating
    string = (char *) zlistx_first (list);
    assert (streq (string, "eight"));
    string = (char *) zlistx_next (list);
    assert (streq (string, "five"));
    zlistx_delete (list, zlistx_cursor (list));
    string = (char *) zlistx_next (list);
    assert (streq (string, "four"));
    //  Test pack/unpack methods
    zframe_t *frame = zlistx_pack (list);
    copy = zlistx_unpack (frame);
    assert (copy);
    zframe_destroy (&frame);
    assert (zlistx_size (copy) == zlistx_size (list));
    char *item_orig = (char *) zlistx_first (list);
    char *item_copy = (char *) zlistx_first (copy);
    while (item_orig) {
        assert (strcmp(item_orig, item_copy) == 0);
        item_orig = (char *) zlistx_next (list);
        item_copy = (char *) zlistx_next (copy);
    }
    zlistx_destroy (&copy);
    zlistx_purge (list);
    zlistx_destroy (&list);
    #if defined (__WINDOWS__)
    zsys_shutdown();
    #endif

AUTHORS

The czmq manual was written by the authors in the AUTHORS file.

RESOURCES

Main web site:

Report bugs to the email <zeromq-dev@lists.zeromq.org[1]>

COPYRIGHT

Copyright (c) the Contributors as noted in the AUTHORS file. This file is part of CZMQ, the high-level C binding for 0MQ: http://czmq.zeromq.org. This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/. LICENSE included with the czmq distribution.

NOTES

1.  zeromq-dev@lists.zeromq.org
    mailto:zeromq-dev@lists.zeromq.org