4626a19c86
QAPI_CLONE() returns a newly allocated QAPI object. Inconvenient when we want to clone into an existing object. QAPI_CLONE_MEMBERS() does exactly that. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1493192202-3184-4-git-send-email-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*
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* Clone Visitor
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*
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* Copyright (C) 2016 Red Hat, Inc.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef QAPI_CLONE_VISITOR_H
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#define QAPI_CLONE_VISITOR_H
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#include "qemu/typedefs.h"
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#include "qapi/visitor.h"
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#include "qapi-visit.h"
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/*
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* The clone visitor is for direct use only by the QAPI_CLONE() macro;
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* it requires that the root visit occur on an object, list, or
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* alternate, and is not usable directly on built-in QAPI types.
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*/
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typedef struct QapiCloneVisitor QapiCloneVisitor;
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void *qapi_clone(const void *src, void (*visit_type)(Visitor *, const char *,
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void **, Error **));
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void qapi_clone_members(void *dst, const void *src, size_t sz,
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void (*visit_type_members)(Visitor *, void *,
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Error **));
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/*
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* Deep-clone QAPI object @src of the given @type, and return the result.
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*
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* Not usable on QAPI scalars (integers, strings, enums), nor on a
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* QAPI object that references the 'any' type. Safe when @src is NULL.
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*/
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#define QAPI_CLONE(type, src) \
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((type *)qapi_clone(src, \
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(void (*)(Visitor *, const char *, void**, \
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Error **))visit_type_ ## type))
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/*
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* Copy deep clones of @type members from @src to @dst.
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*
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* Not usable on QAPI scalars (integers, strings, enums), nor on a
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* QAPI object that references the 'any' type.
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*/
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#define QAPI_CLONE_MEMBERS(type, dst, src) \
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qapi_clone_members(dst, src, sizeof(type), \
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(void (*)(Visitor *, void *, \
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Error **))visit_type_ ## type ## _members)
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#endif
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