From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from m15111.mail.126.com (m15111.mail.126.com [220.181.15.111]) by sourceware.org (Postfix) with ESMTPS id 8E1DA3857C40 for ; Wed, 12 Aug 2020 02:48:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 8E1DA3857C40 Received: from [192.168.50.220] (unknown [116.236.172.42]) by smtp1 (Coremail) with SMTP id C8mowABHS08MWDNf9z0GIg--.40035S2; Wed, 12 Aug 2020 10:46:38 +0800 (CST) Subject: Re: Coding style for C++ constructs going forward To: Nathan Sidwell , Luis Machado , "gdb@sourceware.org" , gcc Mailing List , Pedro Alves , Simon Marchi References: <33412819-8a5e-0c7f-7cfb-f3d127dc2242@linaro.org> From: Liu Hao Autocrypt: addr=lh_mouse@126.com; prefer-encrypt=mutual; keydata= mQINBFvNzjsBEADgRSHQwFcRdrKpmUxYOyjJKduTZgGP90O0ZrSUzqjuM5x/0NpjgV3PRk7S OWMJAQ3u66jyG/iZnMzpIca+gdObCtaqHPG5NyOwlUjlQcRI7tTaJWGjwVTco2np6z1msAkE L4dRCwVaud5U8LoukcQcuBiCrsdx2Sp9QUR33lUEfQajks0HKFvHHqdooHiflEY89lLpcM18 r+VMXviPrBPBoYesvYWSWLEDKnAkxl+y2KjPFnCUYFh4eHlh2GndUGPZMCYqu8t8EJcfl/Zp nRkHjRDhqwNHHj2JCTO2U12H25G0C2pvlbeZNTDnTp7m0YGsnp6RO4sFYxQE0f4rxqA1K7BP gBdlqdOJO/CasCMNeGqjP1lcSIJ38/EBLR/GyM7yNwT9P1oowy3KE+w0NlSrWxLU4zs873Ev SKx33xcmyVkZyZjMWA+OFt4LM57fK/CwJc3C0yFYJsutpP0espCr2IJLGEcP/srL71SRFZ9I nZBnV3uyWPxWDvjB0tDLmXCi1I7Uprz607yCjxEiHlclk1KSrRizRL/XJNbz3TxqbiwRjp6+ u2OJZv1j8XGb6XCWdEEyQYS47pFLHthocdlTutrHjFFMYIh8jvcX2ulX3I2aWuiqyGep32Zd gLxWCk4VdKnmLVMG53ERTXKR/GfH31uwWRpD212Zq1VU6weeVwARAQABtBpMaXUgSGFvIDxs aF9tb3VzZUAxMjYuY29tPokCVAQTAQoAPhYhBJ/XgxqbURL361kXj0GzMngiMVvEBQJbzc47 AhsjBQkJZgGABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEEGzMngiMVvEOBAP/jnQVwl7 IQKTr1xd2WRkQ+yefR+QFP1a0ujPPSKxne0e+6K97qt51E8JELGCdIoVXlzsvaFXSIqVgncH 0VnV9ciDV7jlBI/G66btRZDfGwYBSSOmgz/rTkBrpmC8+lPbqUDWdLx5J6bjUroS8XWlN3oS RZAPI+RzWjT89S+q19HGESuV+/h9OTxO51RIeA4/XVueWXFWaZ2ZQrsiBE2HZg1rZ2654i4b OnKOgFyj4FibZXmcSgDr6O6LjaXVCm2dfZZ2jkjEMzaI/FRE/yj2EKciKk5Fjy6lpWG/xyCn YhGgI6THu1Ynbz2RMm1cSISXJkC73xfkAjpRsHM0yAFU3EAlGGMo8eDV3VhFDGftPZFqd4uN YC7ku9PSxi1UF+T//QXqerSIofLegjG9Lu3brILV6f5BqhUod6++EqenydndpSvvxHjrSFz0 qzQEDpcc/sPDQbtYayAKHYzGV6SPITiAnItoB7M43WNW56uJtULuuZhRz9r6umJa1Y+gzCkt kDW1yAcWQ5VEAcI4mUBHvbmS9KKnTbw6SRQvHSXMELOVVPYjZceiA9NacESuVuwfVLm9O7vR 4ADFm4cColAsdm62vcbLLohws1MMMAw9SvL1X0v2VxCAYf40pUPtg3DHJWwdi7By4aSc4pqn 6DtDMXrMZ3oqQKKgMM/d+ohw+KGJuQINBFvNzjsBEADGwb/XwE2xzrUnmMjsIpobIOG6sjS2 WE0n/ocTe2cWqSLxwSAwNQ9LXJSgNb9qTTSxLKN/exHFMIalpypN8gpckQ13mGziayYb2LzS 2E9Rlocp91Fv3grR5lrMkCAMtKpcSj1d4hOdMcLOTiJTmDNz06FSmSQBwO3RzrwSCFVibOWn 444cdsc2nd6R96pcff2EnT8h0wrZnwqCUmqTFxVwYcZvTCM/qh8kbUB6cFfk9qOf/az62Yxo jatBBle63xv4SyhRwIokeLzQpU3MeNTLFYEBUkD91min8Du/NfhYS3ZwU6J3vMTm+53kru2N hOMqlgBAs24aJsJYeM2YIPbLVw5ZdG9AvrxTRxVu78DTlgypYMbkM7OFGqWBNamFmhFHZkSi PVHJm225B0tByBpdpxCZtWo2K4ygjE/tqBiN26U1WBjiZb2YO6qw32hnIlSt2t8nX+R+sLJW 9ypolc/Mh+FWdQD/g0JoOimT0d8D8awF1jia8W8MkRREWuUHFEkoDL4M9t+2yNGhpBsW1cXf MUNzOyP/E6I8GzgEWWovz/ut1j6uWPABCCxytrjGwZw/yqA9yqQjHC8rdzfD2r4rKz8MRpJF qWvL4Arco90so8eJpYLHyTtV7pfVHnWXPktoPTkMqUgQ8twDeywI/VT+sgOIXBP8d5HU0afE bDr+GQARAQABiQI8BBgBCgAmFiEEn9eDGptREvfrWRePQbMyeCIxW8QFAlvNzjsCGwwFCQlm AYAACgkQQbMyeCIxW8TKUhAAuQypJgJ7wIpjzji+Y/2hAhaxEnrCsUjcF6L0b2HSvuy+F2/a kuptJWa2MGUCbzQK5/Ki9S3+s7SxfzjiTk83CB/nKPuMORGly2f84H7fyKWzJCjkxmnV7PnQ iofkJLA6uoxsVR5t72kWL/s/OwcxRP5KJvMVaSUVxWrcStfcc8+FcKetDIqS3u3rHPpJO+uW MFBOJM97Cz2sSMfJ0ZpgIpKDM5Qh/Ak2Fw6dzh99V+mpBVGEL98dAibuzdKbFBZTmgSOgaJT b7i4D0hK2fxyHZE9iiCjqlO8EIGRrjWAr8I5y+d2sDPSkuJUmFXhctRem0do+fNvmUwAyNGD SqWW0mtlTOe1Ur0rcYcgq3owgABOlM6qdbPyZ6sEUbJ0RtR86+ksfhrxtLUf0oz84eqrGjFd NYTVgomeWDuW6q+a5JX4YN9LbYc9OZhjfNTJ0q5K00JvqOHPLYertlF3uscbA+KKhvtZ3x8w o2xAthMRzUGlYy+lHGJ8zUE7PKkeD2rBYfMs7mId7EQ8UNc6ZwvmL0WtZhTiXpmJNAtWBWeG D7zfJr1Z5i/s7tOMyAi6e8J9l5pt6IPa//uByXAGcdOzPADdAxlBLPkJStS/m2RFfDTbdWiZ Flo+wGMdJXNbeLQ4ykdbLbkeTBCH9TSQVmH34GlTT/O6N8xQJF7PSp+Sn0w= Message-ID: Date: Wed, 12 Aug 2020 10:46:36 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="BmvVFXElxOwZtiChvuooHlWiMsn0WVnq2" X-CM-TRANSID: C8mowABHS08MWDNf9z0GIg--.40035S2 X-Coremail-Antispam: 1Uf129KBjvdXoW7GFyxXF1DtrW3GrWfuF1xKrg_yoWxKrg_C3 WfJ3Z7uw1UXa4qva4qyw1xAr93AFZxX34xZ34kXryrJ3y5XFn5GFn7J39Iya1xXw1UKr9r GFyY9a42ka4I9jkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IU5-18PUUUUU== X-Originating-IP: [116.236.172.42] X-CM-SenderInfo: 5okbz0xxvhqiyswou0bp/1tbi5A5+RlpD-JX7swAAsq X-Spam-Status: No, score=-0.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, KAM_MANYTO, NICE_REPLY_A, RCVD_IN_BARRACUDACENTRAL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Aug 2020 02:48:16 -0000 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --BmvVFXElxOwZtiChvuooHlWiMsn0WVnq2 Content-Type: multipart/mixed; boundary="gz2len6xGCTAnxq9yaFhgdumPFH2fpwLo" --gz2len6xGCTAnxq9yaFhgdumPFH2fpwLo Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable =E5=9C=A8 2020/8/11 =E4=B8=8B=E5=8D=889:55, Nathan Sidwell =E5=86=99=E9=81= =93: >=20 > I agree, it's the way I use auto.=C2=A0 I particularly like the > =C2=A0=C2=A0 auto *foo =3D expr; > idiom, when you're getting a pointer, but the type of the pointee is cl= ear.=C2=A0 It informs how you use 'foo'. >=20 >=20 Personally I dislike this syntax. Pointers are objects, and `auto foo =3D= expr;` should suffice. What if the type of `expr` is `unique_ptr` or `optional`? The ptr-operator just can't exist there= =2E So why the differentiation? `auto& foo =3D ...` and `const auto& foo =3D ...` are necessary to indica= te that the entity being declared is a reference (and is not an object), while `auto*` doesn't make much sense, as I discourage= plain pointers in my projects. --=20 Best regards, LH_Mouse --gz2len6xGCTAnxq9yaFhgdumPFH2fpwLo-- --BmvVFXElxOwZtiChvuooHlWiMsn0WVnq2 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEn9eDGptREvfrWRePQbMyeCIxW8QFAl8zWAwACgkQQbMyeCIx W8SK3hAAnbU8DEtH2GaGgOfHbrfeatVd0lNP8Aeqbtf7JpmOly7iu5IHnwh2N1gc BOfFJjEXHuv4MeRgLdtsJ/30Jg0zIMQMXvoar4EhIPXC+n9fxMwKMLEUf6q+lbUV ZHSQ9zPpV3JJsHsbhAjEueidf8PjP4zQNza15WifzZ8bCdl2DhBTVC0sIdKkSeAt VYBAvaQfRlKMtCVyx96Jj3ruzTDAE0D5p3lEz/TEf9EOrQuS+YKSlmaJpqWnbfiZ Y1KGkIw9UKTBK3iGDnLyAuepFu63KvMB8bGZ3lByBPQqZQPh50dlpKSl4ZF+0wU7 QvjpY38aGAfYgN0x7aY6QpNWDtOV3CiupyUS+FU3ogKcUOvTcjAowvAtUnAXYrOb mmJyeOgIe88UlzhF4RFEIMS4uQePnZIg0BcTsv6AwXbc0V0iUYYuXAx7A3g18h2u /2YT6MXRLsLZRW+bhQsYgOTmQQg0V+6Uqt3dW1b2Ff/NtGOjeLvnUI1D85nWyX3Y wwZqTAIDX6TK312Fk1uNPjro+E4biJqSACjDuXVpjl882rAPwLHDPR/c3AksnqPt /Y0fVOEf4E2jxsw/Zm3baYkMEbySPe1cZP3UncjvgLEfF0Hp53NZ8HJ5I1A2GKDq WkBbvnUrwF2gOp9M/qdTWx7gioENIs1KPqMh53IwR3myo4/ZEKY= =ofsj -----END PGP SIGNATURE----- --BmvVFXElxOwZtiChvuooHlWiMsn0WVnq2--