mirror of
https://github.com/google/pebble
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45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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//! Simple utility for enforcing consistent use of the iterator pattern
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//! and facilitate unit testing.
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#pragma once
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#include <stdbool.h>
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typedef void* IteratorState;
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typedef bool (*IteratorCallback)(IteratorState state);
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typedef struct {
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IteratorCallback next;
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IteratorCallback prev;
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IteratorState state;
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} Iterator;
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#define ITERATOR_EMPTY ((Iterator){ 0, 0, 0 })
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void iter_init(Iterator* iter, IteratorCallback next, IteratorCallback prev, IteratorState state);
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//! @return true if successfully moved to next node
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bool iter_next(Iterator* iter);
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//! @return true if successfully moved to previous node
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bool iter_prev(Iterator* iter);
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IteratorState iter_get_state(Iterator* iter);
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