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test-display-base: Fix C++ designated initializer for anonymous union

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C++ does not allow designated initializers to refer to members of
anonymous unions. The QXLInterface struct contains an anonymous union
with attached_worker/attache_worker, and the original code used
`{ .attached_worker = attached_worker }` which mixed a non-designated
clause (the outer braces without a field name) with designated clauses
for the other struct members, producing:

  error: either all initializer clauses should be designated or none
  of them should be

Simply removing the braces (`.attached_worker = attached_worker`) does
not help either, because C++ compilers do not recognize anonymous union
members as valid designators at the enclosing struct level.

Work around this by using an immediately-invoked lambda: the designated
initializer list skips the anonymous union (which gets zero-initialized),
and the lambda assigns `attached_worker` explicitly before returning
the fully initialized struct.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Marc-André Lureau 2026-02-09 16:52:13 +04:00
parent e45861f995
commit a68319bd34
1 changed files with 28 additions and 24 deletions
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52
server/tests/test-display-base.cpp
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@ -799,31 +799,35 @@ static void set_client_capabilities(QXLInstance *qin,
}
}
static QXLInterface display_sif = {
.base = {
.type = SPICE_INTERFACE_QXL,
.description = "test",
.major_version = SPICE_INTERFACE_QXL_MAJOR,
.minor_version = SPICE_INTERFACE_QXL_MINOR
},
{ .attached_worker = attached_worker },
.set_compression_level = set_compression_level,
.set_mm_time = nullptr,
.get_init_info = get_init_info,
static QXLInterface display_sif = []() {
QXLInterface sif = {
.base = {
.type = SPICE_INTERFACE_QXL,
.description = "test",
.major_version = SPICE_INTERFACE_QXL_MAJOR,
.minor_version = SPICE_INTERFACE_QXL_MINOR
},
/* anonymous union member can't use designated initializer in C++ */
.set_compression_level = set_compression_level,
.set_mm_time = nullptr,
.get_init_info = get_init_info,
/* the callbacks below are called from spice server thread context */
.get_command = get_command,
.req_cmd_notification = req_cmd_notification,
.release_resource = release_resource,
.get_cursor_command = get_cursor_command,
.req_cursor_notification = req_cursor_notification,
.notify_update = notify_update,
.flush_resources = flush_resources,
.async_complete = nullptr,
.update_area_complete = nullptr,
.set_client_capabilities = set_client_capabilities,
.client_monitors_config = client_monitors_config,
};
/* the callbacks below are called from spice server thread context */
.get_command = get_command,
.req_cmd_notification = req_cmd_notification,
.release_resource = release_resource,
.get_cursor_command = get_cursor_command,
.req_cursor_notification = req_cursor_notification,
.notify_update = notify_update,
.flush_resources = flush_resources,
.async_complete = nullptr,
.update_area_complete = nullptr,
.set_client_capabilities = set_client_capabilities,
.client_monitors_config = client_monitors_config,
};
sif.attached_worker = attached_worker;
return sif;
}();
/* interface for tests */
void test_add_display_interface(Test* test)