tree 845301a814ef98a100361d31002fe0bb7dfc0665
parent cd3bf08af911356288ddc999337ec9554bd72863
author Lei YU <yulei.sh@bytedance.com> 1726037371 +0000
committer Patrick Williams <patrick@stwcx.xyz> 1734013789 +0000

asio: connection: Return unpacked value directly

`yield_method_call()` shall return the values of DBus methods, and it
was using constexpr if to check `sizeof...(RetTypes)` to get the return
type and construct default return values.

`message::unpack()` does the same thing so it is possible to return
directly.

In case of error occurs, it still need to return the default-constructed
value, so a helper function `default_ret_types()` is introduced for
default return in such case.

Change-Id: Iac7501dc03c1cfaf16f59f7ae742168c6be5886d
Signed-off-by: Lei YU <yulei.sh@bytedance.com>