[{"id":3440,"web_url":"https://patchwork.libcamera.org/comment/3440/","msgid":"<7b57020c-7b09-9cf2-43ef-0be180095629@ideasonboard.com>","date":"2020-01-14T02:11:54","subject":"Re: [libcamera-devel] [PATCH 1/2] meson.build: Switch to C++14","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Hi Laurent,\n\nOn 14/01/2020 00:15, Laurent Pinchart wrote:\n> C++14 is a minor release that doesn't introduce major new concepts or\n> paradigms compared to C++11, but brings two useful changes for us:\n> \n> - std::make_unique allows dropping our custom implementation in utils.\n> - Functions returning constexpr are not assumed to be const anymore,\n> which is needed to create a standard-conformant span implementation.\n> \n> All the g++ and clang++ versions we support and test (g++-5 onwards and\n> clang++6 onwards) support C++14. However, due to a defect in the\n> original C++14 specification, solved in N4387 ([1]), compilation would\n> fail on g++-5 due to the use of std::map::emplace() with a non-copyable\n> value type. It turns out we can easily fix it by switching to the\n> explicit piecewise emplace() overload.\n\nEeep. That's a bit of a pain, but a short fix is helpful.\n\nAnd we get to progress the defined standard.\n\n> There is thus really nothing holding back the switch. Let's do it, and\n> update the coding style accordingly.\n> \n\n\\o/\n\n> [1] http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4387\n> \n\nAll LGTM.\n\nReviewed-by: Kieran Bingham \n\n\n> Signed-off-by: Laurent Pinchart \n> ---\n> Documentation/coding-style.rst | 23 +++++++++--------------\n> meson.build | 2 +-\n> src/ipa/rkisp1/rkisp1.cpp | 4 +++-\n> 3 files changed, 13 insertions(+), 16 deletions(-)\n> \n> diff --git a/Documentation/coding-style.rst b/Documentation/coding-style.rst\n> index 9939c7b1e86d..bbc1f2fb18c6 100644\n> --- a/Documentation/coding-style.rst\n> +++ b/Documentation/coding-style.rst\n> @@ -86,22 +86,17 @@ headers, and with double quotes for other libcamera headers.\n> C++ Specific Rules\n> ------------------\n> \n> -The code shall be implemented in C++03, extended with the following\n> -C++-11-specific features:\n> -\n> -* Initializer lists\n> -* Type inference (auto and decltype)\n> - Type inference shall be used with caution, to avoid drifting towards an\n> - untyped language.\n> -* Range-based for loop\n> -* Lambda functions\n> -* Explicit overrides and final\n> -* Null pointer constant\n> -* General-purpose smart pointers (std::unique_ptr), deprecating std::auto_ptr.\n> +The code shall be implemented in C++14, with the following caveats:\n> +\n> +* Type inference (auto and decltype) shall be used with caution, to avoid\n> + drifting towards an untyped language.\n> +* The explicit, override and final specifiers are to be used where applicable.\n> +* General-purpose smart pointers (std::unique_ptr) deprecate std::auto_ptr.\n> Smart pointers, as well as shared pointers and weak pointers, shall not be\n> overused.\n> -* Variadic class and function templates\n> -* rvalue references, move constructor and move assignment\n> +* Classes are encouraged to define move constructors and assignment operators\n> + where applicable, and generally make use of the features offered by rvalue\n> + references.\n> \n> Object Ownership\n> ~~~~~~~~~~~~~~~~\n> diff --git a/meson.build b/meson.build\n> index 634488589a46..37cf4d665f7b 100644\n> --- a/meson.build\n> +++ b/meson.build\n> @@ -4,7 +4,7 @@ project('libcamera', 'c', 'cpp',\n> default_options : [\n> 'werror=true',\n> 'warning_level=2',\n> - 'cpp_std=c++11',\n> + 'cpp_std=c++14',\n> ],\n> license : 'LGPL 2.1+')\n> \n> diff --git a/src/ipa/rkisp1/rkisp1.cpp b/src/ipa/rkisp1/rkisp1.cpp\n> index 74b2922004be..a8dd1645d3e8 100644\n> --- a/src/ipa/rkisp1/rkisp1.cpp\n> +++ b/src/ipa/rkisp1/rkisp1.cpp\n> @@ -104,7 +104,9 @@ void IPARkISP1::configure(const std::map &streamConfig,\n> void IPARkISP1::mapBuffers(const std::vector &buffers)\n> {\n> \tfor (const IPABuffer &buffer : buffers) {\n> -\t\tauto elem = buffers_.emplace(buffer.id, buffer.planes);\n> +\t\tauto elem = buffers_.emplace(std::piecewise_construct,\n> +\t\t\t\t\t std::forward_as_tuple(buffer.id),\n> +\t\t\t\t\t std::forward_as_tuple(buffer.planes));\n> \t\tconst FrameBuffer &fb = elem.first->second;\n> \n> \t\t/*\n>","headers":{"Return-Path":"","Received":["from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id CF60A60456\n\tfor ;\n\tTue, 14 Jan 2020 03:11:57 +0100 (CET)","from [192.168.1.106]\n\t(cpc108967-cmbg20-2-0-cust420.5-4.cable.virginm.net [81.101.7.165])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id EF97C563;\n\tTue, 14 Jan 2020 03:11:56 +0100 (CET)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1578967917;\n\tbh=CNAhRyviBsL+xq+MKQLNQVGL92Rd1SakxU+IhkNnbVM=;\n\th=Reply-To:Subject:To:References:From:Date:In-Reply-To:From;\n\tb=TVvnms5Ly8SAc9hud+XEazcoSNifW4GUn6i9nr7cWAmK0IqvxDdbidf3PeBVtM+0c\n\tlT24Xg0dN2wzaASqajNyN0jafm5CVEJbj0G3L7V6+oGuzJFrAAtPxvl5LYpTXwYh/+\n\trj+dxfmSdDxFEQT+YEYCR4Oc/3DW//GBMd4bPGgQ=","Reply-To":"kieran.bingham@ideasonboard.com","To":"Laurent Pinchart ,\n\tlibcamera-devel@lists.libcamera.org","References":"<20200114001531.27129-1-laurent.pinchart@ideasonboard.com>","From":"Kieran Bingham ","Openpgp":"preference=signencrypt","Autocrypt":"addr=kieran.bingham@ideasonboard.com; keydata=\n\tmQINBFYE/WYBEACs1PwjMD9rgCu1hlIiUA1AXR4rv2v+BCLUq//vrX5S5bjzxKAryRf0uHat\n\tV/zwz6hiDrZuHUACDB7X8OaQcwhLaVlq6byfoBr25+hbZG7G3+5EUl9cQ7dQEdvNj6V6y/SC\n\trRanWfelwQThCHckbobWiQJfK9n7rYNcPMq9B8e9F020LFH7Kj6YmO95ewJGgLm+idg1Kb3C\n\tpotzWkXc1xmPzcQ1fvQMOfMwdS+4SNw4rY9f07Xb2K99rjMwZVDgESKIzhsDB5GY465sCsiQ\n\tcSAZRxqE49RTBq2+EQsbrQpIc8XiffAB8qexh5/QPzCmR4kJgCGeHIXBtgRj+nIkCJPZvZtf\n\tKr2EAbc6tgg6DkAEHJb+1okosV09+0+TXywYvtEop/WUOWQ+zo+Y/OBd+8Ptgt1pDRyOBzL8\n\tRXa8ZqRf0Mwg75D+dKntZeJHzPRJyrlfQokngAAs4PaFt6UfS+ypMAF37T6CeDArQC41V3ko\n\tlPn1yMsVD0p+6i3DPvA/GPIksDC4owjnzVX9kM8Zc5Cx+XoAN0w5Eqo4t6qEVbuettxx55gq\n\t8K8FieAjgjMSxngo/HST8TpFeqI5nVeq0/lqtBRQKumuIqDg+Bkr4L1V/PSB6XgQcOdhtd36\n\tOe9X9dXB8YSNt7VjOcO7BTmFn/Z8r92mSAfHXpb07YJWJosQOQARAQABtDBLaWVyYW4gQmlu\n\tZ2hhbSA8a2llcmFuLmJpbmdoYW1AaWRlYXNvbmJvYXJkLmNvbT6JAlcEEwEKAEECGwMFCwkI\n\tBwIGFQgJCgsCBBYCAwECHgECF4ACGQEWIQSQLdeYP70o/eNy1HqhHkZyEKRh/QUCXWTtygUJ\n\tCyJXZAAKCRChHkZyEKRh/f8dEACTDsbLN2nioNZMwyLuQRUAFcXNolDX48xcUXsWS2QjxaPm\n\tVsJx8Uy8aYkS85mdPBh0C83OovQR/OVbr8AxhGvYqBs3nQvbWuTl/+4od7DfK2VZOoKBAu5S\n\tQK2FYuUcikDqYcFWJ8DQnubxfE8dvzojHEkXw0sA4igINHDDFX3HJGZtLio+WpEFQtCbfTAG\n\tYZslasz1YZRbwEdSsmO3/kqy5eMnczlm8a21A3fKUo3g8oAZEFM+f4DUNzqIltg31OAB/kZS\n\tenKZQ/SWC8PmLg/ZXBrReYakxXtkP6w3FwMlzOlhGxqhIRNiAJfXJBaRhuUWzPOpEDE9q5YJ\n\tBmqQL2WJm1VSNNVxbXJHpaWMH1sA2R00vmvRrPXGwyIO0IPYeUYQa3gsy6k+En/aMQJd27dp\n\taScf9am9PFICPY5T4ppneeJLif2lyLojo0mcHOV+uyrds9XkLpp14GfTkeKPdPMrLLTsHRfH\n\tfA4I4OBpRrEPiGIZB/0im98MkGY/Mu6qxeZmYLCcgD6qz4idOvfgVOrNh+aA8HzIVR+RMW8H\n\tQGBN9f0E3kfwxuhl3omo6V7lDw8XOdmuWZNC9zPq1UfryVHANYbLGz9KJ4Aw6M+OgBC2JpkD\n\thXMdHUkC+d20dwXrwHTlrJi1YNp6rBc+xald3wsUPOZ5z8moTHUX/uPA/qhGsbkCDQRWBP1m\n\tARAAzijkb+Sau4hAncr1JjOY+KyFEdUNxRy+hqTJdJfaYihxyaj0Ee0P0zEi35CbE6lgU0Uz\n\ttih9fiUbSV3wfsWqg1Ut3/5rTKu7kLFp15kF7eqvV4uezXRD3Qu4yjv/rMmEJbbD4cTvGCYI\n\td6MDC417f7vK3hCbCVIZSp3GXxyC1LU+UQr3fFcOyCwmP9vDUR9JV0BSqHHxRDdpUXE26Dk6\n\tmhf0V1YkspE5St814ETXpEus2urZE5yJIUROlWPIL+hm3NEWfAP06vsQUyLvr/GtbOT79vXl\n\tEn1aulcYyu20dRRxhkQ6iILaURcxIAVJJKPi8dsoMnS8pB0QW12AHWuirPF0g6DiuUfPmrA5\n\tPKe56IGlpkjc8cO51lIxHkWTpCMWigRdPDexKX+Sb+W9QWK/0JjIc4t3KBaiG8O4yRX8ml2R\n\t+rxfAVKM6V769P/hWoRGdgUMgYHFpHGSgEt80OKK5HeUPy2cngDUXzwrqiM5Sz6Od0qw5pCk\n\tNlXqI0W/who0iSVM+8+RmyY0OEkxEcci7rRLsGnM15B5PjLJjh1f2ULYkv8s4SnDwMZ/kE04\n\t/UqCMK/KnX8pwXEMCjz0h6qWNpGwJ0/tYIgQJZh6bqkvBrDogAvuhf60Sogw+mH8b+PBlx1L\n\toeTK396wc+4c3BfiC6pNtUS5GpsPMMjYMk7kVvEAEQEAAYkCPAQYAQoAJgIbDBYhBJAt15g/\n\tvSj943LUeqEeRnIQpGH9BQJdizzIBQkLSKZiAAoJEKEeRnIQpGH9eYgQAJpjaWNgqNOnMTmD\n\tMJggbwjIotypzIXfhHNCeTkG7+qCDlSaBPclcPGYrTwCt0YWPU2TgGgJrVhYT20ierN8LUvj\n\t6qOPTd+Uk7NFzL65qkh80ZKNBFddx1AabQpSVQKbdcLb8OFs85kuSvFdgqZwgxA1vl4TFhNz\n\tPZ79NAmXLackAx3sOVFhk4WQaKRshCB7cSl+RIng5S/ThOBlwNlcKG7j7W2MC06BlTbdEkUp\n\tECzuuRBv8wX4OQl+hbWbB/VKIx5HKlLu1eypen/5lNVzSqMMIYkkZcjV2SWQyUGxSwq0O/sx\n\tS0A8/atCHUXOboUsn54qdxrVDaK+6jIAuo8JiRWctP16KjzUM7MO0/+4zllM8EY57rXrj48j\n\tsbEYX0YQnzaj+jO6kJtoZsIaYR7rMMq9aUAjyiaEZpmP1qF/2sYenDx0Fg2BSlLvLvXM0vU8\n\tpQk3kgDu7kb/7PRYrZvBsr21EIQoIjXbZxDz/o7z95frkP71EaICttZ6k9q5oxxA5WC6sTXc\n\tMW8zs8avFNuA9VpXt0YupJd2ijtZy2mpZNG02fFVXhIn4G807G7+9mhuC4XG5rKlBBUXTvPU\n\tAfYnB4JBDLmLzBFavQfvonSfbitgXwCG3vS+9HEwAjU30Bar1PEOmIbiAoMzuKeRm2LVpmq4\n\tWZw01QYHU/GUV/zHJSFk","Organization":"Ideas on Board","Message-ID":"<7b57020c-7b09-9cf2-43ef-0be180095629@ideasonboard.com>","Date":"Tue, 14 Jan 2020 02:11:54 +0000","User-Agent":"Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101\n\tThunderbird/60.9.0","MIME-Version":"1.0","In-Reply-To":"<20200114001531.27129-1-laurent.pinchart@ideasonboard.com>","Content-Type":"text/plain; charset=utf-8","Content-Language":"en-GB","Content-Transfer-Encoding":"7bit","Subject":"Re: [libcamera-devel] [PATCH 1/2] meson.build: Switch to C++14","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","X-List-Received-Date":"Tue, 14 Jan 2020 02:11:58 -0000"}},{"id":3446,"web_url":"https://patchwork.libcamera.org/comment/3446/","msgid":"<20200114142125.GA925806@oden.dyn.berto.se>","date":"2020-01-14T14:21:25","subject":"Re: [libcamera-devel] [PATCH 1/2] meson.build: Switch to C++14","submitter":{"id":5,"url":"https://patchwork.libcamera.org/api/people/5/","name":"Niklas Söderlund","email":"niklas.soderlund@ragnatech.se"},"content":"Hi Laurent,\n\nThanks for your work.\n\nOn 2020-01-14 02:15:30 +0200, Laurent Pinchart wrote:\n> C++14 is a minor release that doesn't introduce major new concepts or\n> paradigms compared to C++11, but brings two useful changes for us:\n> \n> - std::make_unique allows dropping our custom implementation in utils.\n> - Functions returning constexpr are not assumed to be const anymore,\n> which is needed to create a standard-conformant span implementation.\n> \n> All the g++ and clang++ versions we support and test (g++-5 onwards and\n> clang++6 onwards) support C++14. However, due to a defect in the\n> original C++14 specification, solved in N4387 ([1]), compilation would\n> fail on g++-5 due to the use of std::map::emplace() with a non-copyable\n> value type. It turns out we can easily fix it by switching to the\n> explicit piecewise emplace() overload.\n> \n> There is thus really nothing holding back the switch. Let's do it, and\n> update the coding style accordingly.\n> \n> [1] http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4387\n> \n> Signed-off-by: Laurent Pinchart \n\nReviewed-by: Niklas Söderlund \n\n> ---\n> Documentation/coding-style.rst | 23 +++++++++--------------\n> meson.build | 2 +-\n> src/ipa/rkisp1/rkisp1.cpp | 4 +++-\n> 3 files changed, 13 insertions(+), 16 deletions(-)\n> \n> diff --git a/Documentation/coding-style.rst b/Documentation/coding-style.rst\n> index 9939c7b1e86d..bbc1f2fb18c6 100644\n> --- a/Documentation/coding-style.rst\n> +++ b/Documentation/coding-style.rst\n> @@ -86,22 +86,17 @@ headers, and with double quotes for other libcamera headers.\n> C++ Specific Rules\n> ------------------\n> \n> -The code shall be implemented in C++03, extended with the following\n> -C++-11-specific features:\n> -\n> -* Initializer lists\n> -* Type inference (auto and decltype)\n> - Type inference shall be used with caution, to avoid drifting towards an\n> - untyped language.\n> -* Range-based for loop\n> -* Lambda functions\n> -* Explicit overrides and final\n> -* Null pointer constant\n> -* General-purpose smart pointers (std::unique_ptr), deprecating std::auto_ptr.\n> +The code shall be implemented in C++14, with the following caveats:\n> +\n> +* Type inference (auto and decltype) shall be used with caution, to avoid\n> + drifting towards an untyped language.\n> +* The explicit, override and final specifiers are to be used where applicable.\n> +* General-purpose smart pointers (std::unique_ptr) deprecate std::auto_ptr.\n> Smart pointers, as well as shared pointers and weak pointers, shall not be\n> overused.\n> -* Variadic class and function templates\n> -* rvalue references, move constructor and move assignment\n> +* Classes are encouraged to define move constructors and assignment operators\n> + where applicable, and generally make use of the features offered by rvalue\n> + references.\n> \n> Object Ownership\n> ~~~~~~~~~~~~~~~~\n> diff --git a/meson.build b/meson.build\n> index 634488589a46..37cf4d665f7b 100644\n> --- a/meson.build\n> +++ b/meson.build\n> @@ -4,7 +4,7 @@ project('libcamera', 'c', 'cpp',\n> default_options : [\n> 'werror=true',\n> 'warning_level=2',\n> - 'cpp_std=c++11',\n> + 'cpp_std=c++14',\n> ],\n> license : 'LGPL 2.1+')\n> \n> diff --git a/src/ipa/rkisp1/rkisp1.cpp b/src/ipa/rkisp1/rkisp1.cpp\n> index 74b2922004be..a8dd1645d3e8 100644\n> --- a/src/ipa/rkisp1/rkisp1.cpp\n> +++ b/src/ipa/rkisp1/rkisp1.cpp\n> @@ -104,7 +104,9 @@ void IPARkISP1::configure(const std::map &streamConfig,\n> void IPARkISP1::mapBuffers(const std::vector &buffers)\n> {\n> \tfor (const IPABuffer &buffer : buffers) {\n> -\t\tauto elem = buffers_.emplace(buffer.id, buffer.planes);\n> +\t\tauto elem = buffers_.emplace(std::piecewise_construct,\n> +\t\t\t\t\t std::forward_as_tuple(buffer.id),\n> +\t\t\t\t\t std::forward_as_tuple(buffer.planes));\n> \t\tconst FrameBuffer &fb = elem.first->second;\n> \n> \t\t/*\n> -- \n> Regards,\n> \n> Laurent Pinchart\n> \n> _______________________________________________\n> libcamera-devel mailing list\n> libcamera-devel@lists.libcamera.org\n> https://lists.libcamera.org/listinfo/libcamera-devel","headers":{"Return-Path":"","Received":["from mail-lj1-x242.google.com (mail-lj1-x242.google.com\n\t[IPv6:2a00:1450:4864:20::242])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 837D26017C\n\tfor ;\n\tTue, 14 Jan 2020 15:21:27 +0100 (CET)","by mail-lj1-x242.google.com with SMTP id y6so14587567lji.0\n\tfor ;\n\tTue, 14 Jan 2020 06:21:27 -0800 (PST)","from localhost (h-93-159.A463.priv.bahnhof.se. 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