universe@706: /*
universe@706:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
universe@706:  *
universe@706:  * Copyright 2023 Mike Becker, Olaf Wintermann All rights reserved.
universe@706:  *
universe@706:  * Redistribution and use in source and binary forms, with or without
universe@706:  * modification, are permitted provided that the following conditions are met:
universe@706:  *
universe@706:  *   1. Redistributions of source code must retain the above copyright
universe@706:  *      notice, this list of conditions and the following disclaimer.
universe@706:  *
universe@706:  *   2. Redistributions in binary form must reproduce the above copyright
universe@706:  *      notice, this list of conditions and the following disclaimer in the
universe@706:  *      documentation and/or other materials provided with the distribution.
universe@706:  *
universe@706:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@706:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@706:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@706:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@706:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@706:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@706:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@706:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@706:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@706:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@706:  * POSSIBILITY OF SUCH DAMAGE.
universe@706:  */
universe@706: 
universe@706: #include "cx/map.h"
universe@709: #include <string.h>
universe@706: 
universe@706: // <editor-fold desc="empty map implementation">
universe@706: 
universe@706: static void cx_empty_map_noop(__attribute__((__unused__)) CxMap *map) {
universe@706:     // this is a noop, but MUST be implemented
universe@706: }
universe@706: 
universe@706: static void *cx_empty_map_get(
universe@706:         __attribute__((__unused__)) CxMap const *map,
universe@706:         __attribute__((__unused__)) CxHashKey key
universe@706: ) {
universe@706:     return NULL;
universe@706: }
universe@706: 
universe@706: static bool cx_empty_map_iter_valid(__attribute__((__unused__)) void const *iter) {
universe@706:     return false;
universe@706: }
universe@706: 
universe@709: static CxIterator cx_empty_map_iterator(
universe@709:         struct cx_map_s const *map,
universe@709:         __attribute__((__unused__)) enum cx_map_iterator_type type
universe@709: ) {
universe@706:     CxIterator iter = {0};
universe@706:     iter.src_handle = map;
universe@706:     iter.base.valid = cx_empty_map_iter_valid;
universe@706:     return iter;
universe@706: }
universe@706: 
universe@706: static struct cx_map_class_s cx_empty_map_class = {
universe@709:         cx_empty_map_noop,
universe@709:         cx_empty_map_noop,
universe@709:         NULL,
universe@709:         cx_empty_map_get,
universe@709:         NULL,
universe@709:         cx_empty_map_iterator
universe@706: };
universe@706: 
universe@706: CxMap cx_empty_map = {
universe@706:         NULL,
universe@706:         NULL,
universe@706:         0,
universe@706:         0,
universe@706:         NULL,
universe@706:         NULL,
universe@706:         NULL,
universe@706:         false,
universe@706:         &cx_empty_map_class
universe@706: };
universe@706: 
universe@709: CxMap *const cxEmptyMap = &cx_empty_map;
universe@706: 
universe@706: // </editor-fold>
universe@709: 
universe@709: CxMutIterator cxMapMutIteratorValues(CxMap *map) {
universe@709:     CxIterator it = map->cl->iterator(map, CX_MAP_ITERATOR_VALUES);
universe@709:     it.base.mutating = true;
universe@709: 
universe@709:     // we know the iterators share the same memory layout
universe@709:     CxMutIterator iter;
universe@709:     memcpy(&iter, &it, sizeof(CxMutIterator));
universe@709:     return iter;
universe@709: }
universe@709: 
universe@709: CxMutIterator cxMapMutIteratorKeys(CxMap *map) {
universe@709:     CxIterator it = map->cl->iterator(map, CX_MAP_ITERATOR_KEYS);
universe@709:     it.base.mutating = true;
universe@709: 
universe@709:     // we know the iterators share the same memory layout
universe@709:     CxMutIterator iter;
universe@709:     memcpy(&iter, &it, sizeof(CxMutIterator));
universe@709:     return iter;
universe@709: }
universe@709: 
universe@709: CxMutIterator cxMapMutIterator(CxMap *map) {
universe@709:     CxIterator it = map->cl->iterator(map, CX_MAP_ITERATOR_PAIRS);
universe@709:     it.base.mutating = true;
universe@709: 
universe@709:     // we know the iterators share the same memory layout
universe@709:     CxMutIterator iter;
universe@709:     memcpy(&iter, &it, sizeof(CxMutIterator));
universe@709:     return iter;
universe@709: }