diff -r e79a60b3a7cb -r 7c3ff86ee9d4 ucx/cx/list.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/cx/list.h	Tue May 23 11:11:28 2023 +0200
@@ -0,0 +1,650 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2021 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.
+ */
+/**
+ * \file list.h
+ * \brief Interface for list implementations.
+ * \author Mike Becker
+ * \author Olaf Wintermann
+ * \version 3.0
+ * \copyright 2-Clause BSD License
+ */
+
+#ifndef UCX_LIST_H
+#define UCX_LIST_H
+
+#include "common.h"
+#include "collection.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * List class type.
+ */
+typedef struct cx_list_class_s cx_list_class;
+
+/**
+ * Structure for holding the base data of a list.
+ */
+struct cx_list_s {
+    CX_COLLECTION_MEMBERS
+    /**
+     * The list class definition.
+     */
+    cx_list_class const *cl;
+    /**
+     * The actual implementation in case the list class is delegating.
+     */
+    cx_list_class const *climpl;
+};
+
+/**
+ * The class definition for arbitrary lists.
+ */
+struct cx_list_class_s {
+    /**
+     * Destructor function.
+     *
+     * Implementations SHALL invoke the content destructor functions if provided
+     * and SHALL deallocate the list memory, if an allocator is provided.
+     */
+    void (*destructor)(struct cx_list_s *list);
+
+    /**
+     * Member function for inserting a single elements.
+     * Implementors SHOULD see to performant implementations for corner cases.
+     */
+    int (*insert_element)(
+            struct cx_list_s *list,
+            size_t index,
+            void const *data
+    );
+
+    /**
+     * Member function for inserting multiple elements.
+     * Implementors SHOULD see to performant implementations for corner cases.
+     */
+    size_t (*insert_array)(
+            struct cx_list_s *list,
+            size_t index,
+            void const *data,
+            size_t n
+    );
+
+    /**
+     * Member function for inserting an element relative to an iterator position.
+     */
+    int (*insert_iter)(
+            struct cx_mut_iterator_s *iter,
+            void const *elem,
+            int prepend
+    );
+
+    /**
+     * Member function for removing an element.
+     */
+    int (*remove)(
+            struct cx_list_s *list,
+            size_t index
+    );
+
+    /**
+     * Member function for removing all elements.
+     */
+    void (*clear)(struct cx_list_s *list);
+
+    /**
+     * Member function for swapping two elements.
+     */
+    int (*swap)(
+            struct cx_list_s *list,
+            size_t i,
+            size_t j
+    );
+
+    /**
+     * Member function for element lookup.
+     */
+    void *(*at)(
+            struct cx_list_s const *list,
+            size_t index
+    );
+
+    /**
+     * Member function for finding an element.
+     */
+    ssize_t (*find)(
+            struct cx_list_s const *list,
+            void const *elem
+    );
+
+    /**
+     * Member function for sorting the list in place.
+     */
+    void (*sort)(struct cx_list_s *list);
+
+    /**
+     * Member function for comparing this list to another list of the same type.
+     */
+    int (*compare)(
+            struct cx_list_s const *list,
+            struct cx_list_s const *other
+    );
+
+    /**
+     * Member function for reversing the order of the items.
+     */
+    void (*reverse)(struct cx_list_s *list);
+
+    /**
+     * Member function for returning an iterator pointing to the specified index.
+     */
+    struct cx_iterator_s (*iterator)(
+            struct cx_list_s const *list,
+            size_t index,
+            bool backward
+    );
+};
+
+/**
+ * Common type for all list implementations.
+ */
+typedef struct cx_list_s CxList;
+
+/**
+ * Advises the list to store copies of the objects (default mode of operation).
+ *
+ * Retrieving objects from this list will yield pointers to the copies stored
+ * within this list.
+ *
+ * @param list the list
+ * @see cxListStorePointers()
+ */
+__attribute__((__nonnull__))
+void cxListStoreObjects(CxList *list);
+
+/**
+ * Advises the list to only store pointers to the objects.
+ *
+ * Retrieving objects from this list will yield the original pointers stored.
+ *
+ * @note This function forcibly sets the element size to the size of a pointer.
+ * Invoking this function on a non-empty list that already stores copies of
+ * objects is undefined.
+ *
+ * @param list the list
+ * @see cxListStoreObjects()
+ */
+__attribute__((__nonnull__))
+void cxListStorePointers(CxList *list);
+
+/**
+ * Returns true, if this list is storing pointers instead of the actual data.
+ *
+ * @param list
+ * @return true, if this list is storing pointers
+ * @see cxListStorePointers()
+ */
+__attribute__((__nonnull__))
+static inline bool cxListIsStoringPointers(CxList const *list) {
+    return list->store_pointer;
+}
+
+/**
+ * Returns the number of elements currently stored in the list.
+ *
+ * @param list the list
+ * @return the number of currently stored elements
+ */
+__attribute__((__nonnull__))
+static inline size_t cxListSize(CxList const *list) {
+    return list->size;
+}
+
+/**
+ * Adds an item to the end of the list.
+ *
+ * @param list the list
+ * @param elem a pointer to the element to add
+ * @return zero on success, non-zero on memory allocation failure
+ * @see cxListAddArray()
+ */
+__attribute__((__nonnull__))
+static inline int cxListAdd(
+        CxList *list,
+        void const *elem
+) {
+    return list->cl->insert_element(list, list->size, elem);
+}
+
+/**
+ * Adds multiple items to the end of the list.
+ *
+ * This method is more efficient than invoking cxListAdd() multiple times.
+ *
+ * If there is not enough memory to add all elements, the returned value is
+ * less than \p n.
+ *
+ * If this list is storing pointers instead of objects \p array is expected to
+ * be an array of pointers.
+ *
+ * @param list the list
+ * @param array a pointer to the elements to add
+ * @param n the number of elements to add
+ * @return the number of added elements
+ */
+__attribute__((__nonnull__))
+static inline size_t cxListAddArray(
+        CxList *list,
+        void const *array,
+        size_t n
+) {
+    return list->cl->insert_array(list, list->size, array, n);
+}
+
+/**
+ * Inserts an item at the specified index.
+ *
+ * If \p index equals the list \c size, this is effectively cxListAdd().
+ *
+ * @param list the list
+ * @param index the index the element shall have
+ * @param elem a pointer to the element to add
+ * @return zero on success, non-zero on memory allocation failure
+ * or when the index is out of bounds
+ * @see cxListInsertAfter()
+ * @see cxListInsertBefore()
+ */
+__attribute__((__nonnull__))
+static inline int cxListInsert(
+        CxList *list,
+        size_t index,
+        void const *elem
+) {
+    return list->cl->insert_element(list, index, elem);
+}
+
+/**
+ * Inserts multiple items to the list at the specified index.
+ * If \p index equals the list size, this is effectively cxListAddArray().
+ *
+ * This method is usually more efficient than invoking cxListInsert()
+ * multiple times.
+ *
+ * If there is not enough memory to add all elements, the returned value is
+ * less than \p n.
+ *
+ * If this list is storing pointers instead of objects \p array is expected to
+ * be an array of pointers.
+ *
+ * @param list the list
+ * @param index the index where to add the elements
+ * @param array a pointer to the elements to add
+ * @param n the number of elements to add
+ * @return the number of added elements
+ */
+__attribute__((__nonnull__))
+static inline size_t cxListInsertArray(
+        CxList *list,
+        size_t index,
+        void const *array,
+        size_t n
+) {
+    return list->cl->insert_array(list, index, array, n);
+}
+
+/**
+ * Inserts an element after the current location of the specified iterator.
+ *
+ * The used iterator remains operational, but all other active iterators should
+ * be considered invalidated.
+ *
+ * If \p iter is not a list iterator, the behavior is undefined.
+ * If \p iter is a past-the-end iterator, the new element gets appended to the list.
+ *
+ * @param iter an iterator
+ * @param elem the element to insert
+ * @return zero on success, non-zero on memory allocation failure
+ * @see cxListInsert()
+ * @see cxListInsertBefore()
+ */
+__attribute__((__nonnull__))
+static inline int cxListInsertAfter(
+        CxMutIterator *iter,
+        void const *elem
+) {
+    return ((struct cx_list_s *) iter->src_handle)->cl->insert_iter(iter, elem, 0);
+}
+
+/**
+ * Inserts an element before the current location of the specified iterator.
+ *
+ * The used iterator remains operational, but all other active iterators should
+ * be considered invalidated.
+ *
+ * If \p iter is not a list iterator, the behavior is undefined.
+ * If \p iter is a past-the-end iterator, the new element gets appended to the list.
+ *
+ * @param iter an iterator
+ * @param elem the element to insert
+ * @return zero on success, non-zero on memory allocation failure
+ * @see cxListInsert()
+ * @see cxListInsertAfter()
+ */
+__attribute__((__nonnull__))
+static inline int cxListInsertBefore(
+        CxMutIterator *iter,
+        void const *elem
+) {
+    return ((struct cx_list_s *) iter->src_handle)->cl->insert_iter(iter, elem, 1);
+}
+
+/**
+ * Removes the element at the specified index.
+ *
+ * If an element destructor function is specified, it is called before
+ * removing the element.
+ *
+ * @param list the list
+ * @param index the index of the element
+ * @return zero on success, non-zero if the index is out of bounds
+ */
+__attribute__((__nonnull__))
+static inline int cxListRemove(
+        CxList *list,
+        size_t index
+) {
+    return list->cl->remove(list, index);
+}
+
+/**
+ * Removes all elements from this list.
+ *
+ * If an element destructor function is specified, it is called for each
+ * element before removing them.
+ *
+ * @param list the list
+ */
+__attribute__((__nonnull__))
+static inline void cxListClear(CxList *list) {
+    list->cl->clear(list);
+}
+
+/**
+ * Swaps two items in the list.
+ *
+ * Implementations should only allocate temporary memory for the swap, if
+ * it is necessary.
+ *
+ * @param list the list
+ * @param i the index of the first element
+ * @param j the index of the second element
+ * @return zero on success, non-zero if one of the indices is out of bounds
+ */
+__attribute__((__nonnull__))
+static inline int cxListSwap(
+        CxList *list,
+        size_t i,
+        size_t j
+) {
+    return list->cl->swap(list, i, j);
+}
+
+/**
+ * Returns a pointer to the element at the specified index.
+ *
+ * @param list the list
+ * @param index the index of the element
+ * @return a pointer to the element or \c NULL if the index is out of bounds
+ */
+__attribute__((__nonnull__))
+static inline void *cxListAt(
+        CxList *list,
+        size_t index
+) {
+    return list->cl->at(list, index);
+}
+
+/**
+ * Returns an iterator pointing to the item at the specified index.
+ *
+ * The returned iterator is position-aware.
+ *
+ * If the index is out of range, a past-the-end iterator will be returned.
+ *
+ * @param list the list
+ * @param index the index where the iterator shall point at
+ * @return a new iterator
+ */
+__attribute__((__nonnull__, __warn_unused_result__))
+static inline CxIterator cxListIteratorAt(
+        CxList const *list,
+        size_t index
+) {
+    return list->cl->iterator(list, index, false);
+}
+
+/**
+ * Returns a backwards iterator pointing to the item at the specified index.
+ *
+ * The returned iterator is position-aware.
+ *
+ * If the index is out of range, a past-the-end iterator will be returned.
+ *
+ * @param list the list
+ * @param index the index where the iterator shall point at
+ * @return a new iterator
+ */
+__attribute__((__nonnull__, __warn_unused_result__))
+static inline CxIterator cxListBackwardsIteratorAt(
+        CxList const *list,
+        size_t index
+) {
+    return list->cl->iterator(list, index, true);
+}
+
+/**
+ * Returns a mutating iterator pointing to the item at the specified index.
+ *
+ * The returned iterator is position-aware.
+ *
+ * If the index is out of range, a past-the-end iterator will be returned.
+ *
+ * @param list the list
+ * @param index the index where the iterator shall point at
+ * @return a new iterator
+ */
+__attribute__((__nonnull__, __warn_unused_result__))
+CxMutIterator cxListMutIteratorAt(
+        CxList *list,
+        size_t index
+);
+
+/**
+ * Returns a mutating backwards iterator pointing to the item at the
+ * specified index.
+ *
+ * The returned iterator is position-aware.
+ *
+ * If the index is out of range, a past-the-end iterator will be returned.
+ *
+ * @param list the list
+ * @param index the index where the iterator shall point at
+ * @return a new iterator
+ */
+__attribute__((__nonnull__, __warn_unused_result__))
+CxMutIterator cxListMutBackwardsIteratorAt(
+        CxList *list,
+        size_t index
+);
+
+/**
+ * Returns an iterator pointing to the first item of the list.
+ *
+ * The returned iterator is position-aware.
+ *
+ * If the list is empty, a past-the-end iterator will be returned.
+ *
+ * @param list the list
+ * @return a new iterator
+ */
+__attribute__((__nonnull__, __warn_unused_result__))
+static inline CxIterator cxListIterator(CxList const *list) {
+    return list->cl->iterator(list, 0, false);
+}
+
+/**
+ * Returns a mutating iterator pointing to the first item of the list.
+ *
+ * The returned iterator is position-aware.
+ *
+ * If the list is empty, a past-the-end iterator will be returned.
+ *
+ * @param list the list
+ * @return a new iterator
+ */
+__attribute__((__nonnull__, __warn_unused_result__))
+static inline CxMutIterator cxListMutIterator(CxList *list) {
+    return cxListMutIteratorAt(list, 0);
+}
+
+
+/**
+ * Returns a backwards iterator pointing to the last item of the list.
+ *
+ * The returned iterator is position-aware.
+ *
+ * If the list is empty, a past-the-end iterator will be returned.
+ *
+ * @param list the list
+ * @return a new iterator
+ */
+__attribute__((__nonnull__, __warn_unused_result__))
+static inline CxIterator cxListBackwardsIterator(CxList const *list) {
+    return list->cl->iterator(list, list->size - 1, true);
+}
+
+/**
+ * Returns a mutating backwards iterator pointing to the last item of the list.
+ *
+ * The returned iterator is position-aware.
+ *
+ * If the list is empty, a past-the-end iterator will be returned.
+ *
+ * @param list the list
+ * @return a new iterator
+ */
+__attribute__((__nonnull__, __warn_unused_result__))
+static inline CxMutIterator cxListMutBackwardsIterator(CxList *list) {
+    return cxListMutBackwardsIteratorAt(list, list->size - 1);
+}
+
+/**
+ * Returns the index of the first element that equals \p elem.
+ *
+ * Determining equality is performed by the list's comparator function.
+ *
+ * @param list the list
+ * @param elem the element to find
+ * @return the index of the element or a negative
+ * value when the element is not found
+ */
+__attribute__((__nonnull__))
+static inline ssize_t cxListFind(
+        CxList const *list,
+        void const *elem
+) {
+    return list->cl->find(list, elem);
+}
+
+/**
+ * Sorts the list in place.
+ *
+ * \remark The underlying sort algorithm is implementation defined.
+ *
+ * @param list the list
+ */
+__attribute__((__nonnull__))
+static inline void cxListSort(CxList *list) {
+    list->cl->sort(list);
+}
+
+/**
+ * Reverses the order of the items.
+ *
+ * @param list the list
+ */
+__attribute__((__nonnull__))
+static inline void cxListReverse(CxList *list) {
+    list->cl->reverse(list);
+}
+
+/**
+ * Compares a list to another list of the same type.
+ *
+ * First, the list sizes are compared.
+ * If they match, the lists are compared element-wise.
+ *
+ * @param list the list
+ * @param other the list to compare to
+ * @return zero, if both lists are equal element wise,
+ * negative if the first list is smaller, positive if the first list is larger
+ */
+__attribute__((__nonnull__))
+int cxListCompare(
+        CxList const *list,
+        CxList const *other
+);
+
+/**
+ * Deallocates the memory of the specified list structure.
+ *
+ * Also calls content a destructor function, depending on the configuration
+ * in CxList.content_destructor_type.
+ *
+ * This function itself is a destructor function for the CxList.
+ *
+ * @param list the list which shall be destroyed
+ */
+__attribute__((__nonnull__))
+void cxListDestroy(CxList *list);
+
+/**
+ * A shared instance of an empty list.
+ *
+ * Writing to that list is undefined.
+ */
+extern CxList * const cxEmptyList;
+
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // UCX_LIST_H