Message ID | 20250606164156.1442682-5-barnabas.pocze@ideasonboard.com |
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Return-Path: <libcamera-devel-bounces@lists.libcamera.org> X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id 6C872C3324 for <parsemail@patchwork.libcamera.org>; Fri, 6 Jun 2025 16:42:34 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 96F5268DD2; Fri, 6 Jun 2025 18:42:32 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="DFDA754l"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id 1DF0768DB0 for <libcamera-devel@lists.libcamera.org>; Fri, 6 Jun 2025 18:42:16 +0200 (CEST) Received: from pb-laptop.local (185.182.215.79.nat.pool.zt.hu [185.182.215.79]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 9F0D68DB for <libcamera-devel@lists.libcamera.org>; Fri, 6 Jun 2025 18:42:11 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1749228131; bh=2fSH/OQqLg58+3C1YZ6eqgo7YNf9r85SKfkKGtI1OpU=; h=From:To:Subject:Date:In-Reply-To:References:From; b=DFDA754l+P+XyRQISlQC8Zf0k0M8FBMh2hHzqZ+BvLwHi66+VR2KSheqGRaHhZwxu ubz/baKrc1o3KicOiqZfnHi1/9RMST1LS6GR7uSXMH6DNSXuJ3Kye+hLfdBd6GnuYV nKKqZXUx/KyjVC3z/yV39uiSO5Menbcd/Wb/32mA= From: =?utf-8?q?Barnab=C3=A1s_P=C5=91cze?= <barnabas.pocze@ideasonboard.com> To: libcamera-devel@lists.libcamera.org Subject: [RFC PATCH v1 04/23] libcamera: base: cxx20: Add `type_identity{, _t}` Date: Fri, 6 Jun 2025 18:41:37 +0200 Message-ID: <20250606164156.1442682-5-barnabas.pocze@ideasonboard.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250606164156.1442682-1-barnabas.pocze@ideasonboard.com> References: <20250606164156.1442682-1-barnabas.pocze@ideasonboard.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: <libcamera-devel.lists.libcamera.org> List-Unsubscribe: <https://lists.libcamera.org/options/libcamera-devel>, <mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe> List-Archive: <https://lists.libcamera.org/pipermail/libcamera-devel/> List-Post: <mailto:libcamera-devel@lists.libcamera.org> List-Help: <mailto:libcamera-devel-request@lists.libcamera.org?subject=help> List-Subscribe: <https://lists.libcamera.org/listinfo/libcamera-devel>, <mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe> Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" <libcamera-devel-bounces@lists.libcamera.org> |
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diff --git a/include/libcamera/base/details/cxx20.h b/include/libcamera/base/details/cxx20.h index 0d6173d1b..2d26db53e 100644 --- a/include/libcamera/base/details/cxx20.h +++ b/include/libcamera/base/details/cxx20.h @@ -9,4 +9,7 @@ namespace libcamera::details::cxx20 { +template<typename T> struct type_identity { using type = T; }; +template<typename T> using type_identity_t = typename type_identity<T>::type; + } /* namespace libcamera::details::cxx20 */
`type_identity_t` can be used to force non-deduced contexts in templates, such as: void f(T x, type_identity_t<T> y) when calling `f(1u, 2)`, without `type_identity_t`, the compiler could not unambiguously deduce `T` (unsigned int vs int). However, with `type_identity_t`, the type of the argument passed to `y` will not be used to deduce `T`, only the argument passed to `x`. See https://en.cppreference.com/w/cpp/types/type_identity Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> --- include/libcamera/base/details/cxx20.h | 3 +++ 1 file changed, 3 insertions(+)