iterator.h

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/*
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 *
 * 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:
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 *      notice, this list of conditions and the following disclaimer.
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#ifndef UCX_ITERATOR_H
#define UCX_ITERATOR_H
 
#include "common.h"

struct cx_iterator_base_s {
    bool (*valid)(const void *);
    bool (*valid_impl)(const void *);
    void *(*current)(const void *);

    void *(*current_impl)(const void *);
    void (*next)(void *);
    void (*next_impl)(void *);
    bool allow_remove;
    bool remove;
};

typedef struct cx_iterator_base_s CxIteratorBase;

#define CX_ITERATOR_BASE struct cx_iterator_base_s base

struct cx_iterator_s {
    CX_ITERATOR_BASE;

    void *elem_handle;

    void *src_handle;

    size_t index;

    size_t elem_size;

    size_t elem_count;
};

typedef struct cx_iterator_s CxIterator;

#define cxIteratorValid(iter) (iter).base.valid(&(iter))

#define cxIteratorCurrent(iter) (iter).base.current(&iter)

#define cxIteratorNext(iter) (iter).base.next(&iter)

#define cxIteratorFlagRemoval(iter) ((iter).base.remove = (iter).base.allow_remove)

#define cx_foreach(type, elem, iter) \
for (type elem; cxIteratorValid(iter) && (elem = (type)cxIteratorCurrent(iter)) != NULL ; cxIteratorNext(iter))
 

CX_EXTERN CX_NODISCARD
CxIterator cxIterator(const void *array,
        size_t elem_size, size_t elem_count);

CX_EXTERN CX_NODISCARD
CxIterator cxIteratorPtr(const void *array, size_t elem_count);
 
#endif // UCX_ITERATOR_H