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f4b3c5d0bd
By moving the base fields to a QObjectBase_, QObject can be a type which also has a 'base' field. This allows writing a generic QOBJECT() macro that will work with any QObject type, including QObject itself. The container_of() macro ensures that the object to cast has a QObjectBase_ base field, giving some type safety guarantees. QObject must have no members but QObjectBase_ base, or else QOBJECT() breaks. QObjectBase_ is not a typedef and uses a trailing underscore to make it obvious it is not for normal use and to avoid potential abuse. Backports commit 3d3eacaeccaab718ea0e2ddaa578bfae9e311c59 from qemu
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/*
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* QList Module
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*
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* Copyright (C) 2009 Red Hat Inc.
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*
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* Authors:
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* Luiz Capitulino <lcapitulino@redhat.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
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* See the COPYING.LIB file in the top-level directory.
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*/
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#ifndef QLIST_H
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#define QLIST_H
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#include "qapi/qmp/qobject.h"
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#include "qemu/queue.h"
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typedef struct QListEntry {
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QObject *value;
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QTAILQ_ENTRY(QListEntry) next;
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} QListEntry;
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struct QList {
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struct QObjectBase_ base;
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QTAILQ_HEAD(,QListEntry) head;
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};
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#define qlist_append(qlist, obj) \
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qlist_append_obj(qlist, QOBJECT(obj))
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void qlist_append_bool(QList *qlist, bool value);
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void qlist_append_int(QList *qlist, int64_t value);
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void qlist_append_null(QList *qlist);
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void qlist_append_str(QList *qlist, const char *value);
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#define QLIST_FOREACH_ENTRY(qlist, var) \
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for ((var) = ((qlist)->head.tqh_first); \
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(var); \
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(var) = ((var)->next.tqe_next))
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static inline QObject *qlist_entry_obj(const QListEntry *entry)
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{
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return entry->value;
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}
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QList *qlist_new(void);
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QList *qlist_copy(QList *src);
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void qlist_append_obj(QList *qlist, QObject *obj);
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void qlist_iter(const QList *qlist,
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void (*iter)(QObject *obj, void *opaque), void *opaque);
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QObject *qlist_pop(QList *qlist);
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QObject *qlist_peek(QList *qlist);
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int qlist_empty(const QList *qlist);
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size_t qlist_size(const QList *qlist);
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bool qlist_is_equal(const QObject *x, const QObject *y);
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void qlist_destroy_obj(QObject *obj);
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static inline const QListEntry *qlist_first(const QList *qlist)
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{
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return QTAILQ_FIRST(&qlist->head);
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}
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static inline const QListEntry *qlist_next(const QListEntry *entry)
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{
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return QTAILQ_NEXT(entry, next);
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}
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#endif /* QLIST_H */
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