3d3eacaecc
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. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Message-Id: <20180419150145.24795-3-marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/*
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* QString 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 QSTRING_H
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#define QSTRING_H
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#include "qapi/qmp/qobject.h"
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struct QString {
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struct QObjectBase_ base;
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char *string;
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size_t length;
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size_t capacity;
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};
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QString *qstring_new(void);
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QString *qstring_from_str(const char *str);
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QString *qstring_from_substr(const char *str, int start, int end);
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size_t qstring_get_length(const QString *qstring);
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const char *qstring_get_str(const QString *qstring);
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const char *qstring_get_try_str(const QString *qstring);
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const char *qobject_get_try_str(const QObject *qstring);
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void qstring_append_int(QString *qstring, int64_t value);
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void qstring_append(QString *qstring, const char *str);
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void qstring_append_chr(QString *qstring, int c);
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bool qstring_is_equal(const QObject *x, const QObject *y);
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void qstring_destroy_obj(QObject *obj);
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#endif /* QSTRING_H */
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