From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg1-x531.google.com (mail-pg1-x531.google.com [IPv6:2607:f8b0:4864:20::531]) by sourceware.org (Postfix) with ESMTPS id 19250385840E; Tue, 2 Apr 2024 19:41:58 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 19250385840E Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 19250385840E Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::531 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1712086919; cv=none; b=Gtz/aMKmA+sKcEta0aI6ksRimTJCjKm2KwjAzBzoPO48nSLESE+YMNDjkvjuISqzdWzRGzqo/9sPAmT4+88iEwaiZYYJ0dXKUbqUc524kKhLrMHUTjhWC+/UJdWpAPcteyXuIjywgsqKM1erEqzuSThWYuQP3yveNLdBwAYuMj8= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1712086919; c=relaxed/simple; bh=E5n0Rr1BCICg18k6MiIm0PDDxelsmgf8iNLzopD8dVY=; h=DKIM-Signature:MIME-Version:From:Date:Message-ID:Subject:To; b=UyQJF+pJnpGxN+v76yXoixqgE8fd/ijVy17t+Mr1AVodNTWojClzXamFUCeF9Qyj84naCXihLHRQrqeeVCNfBHtqymcMjY1urNkaCXspSLloVk06uOEU5FV+G6s7Pn8TSJwt23BBji5BdwHX/9JQOKR9fHa2o+6EksHvSKkcmIs= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-pg1-x531.google.com with SMTP id 41be03b00d2f7-53fa455cd94so4143403a12.2; Tue, 02 Apr 2024 12:41:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1712086917; x=1712691717; darn=gcc.gnu.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=E5n0Rr1BCICg18k6MiIm0PDDxelsmgf8iNLzopD8dVY=; b=dP/AoP7iMlPBdh9xqJwNyI6Usd9q/43LhHFlwx1erQhTuAuSomubrLO9TvYwoLErwm lOJo42KpYU4PkPGSBo6hmJVMjCYC+jwYcU9EJ1Tpo21tLW7drcLWw7pjfAKEdJdhfa7A d64TzgiDTSyBeS12QkbJeJFNcbkSPMRC3eqpq0j/Ag1vYMzFPJgW5JT6Ex/oSXT/WDSz XjYtJzM6+mkKB2tqVnlbIfTKkzelpFJnRxkC/44WVws9g1HWgsQBQjUyx8tksiEunvSP /n8N1k0Ifn47vBqkjcxqBT3EV+5JDI6RUeSDtzSRODiikPlT/6Dv/mUzbfeHHHI6Byci mUHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712086917; x=1712691717; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=E5n0Rr1BCICg18k6MiIm0PDDxelsmgf8iNLzopD8dVY=; b=AXKvFTkTgth/9vISE949EIeE7LuWD7KM+AwzLuR67Iw//50xZ2v4ec1wuERSC4Kz5g 5ADTLToEqJlY+z9ebpyS578H9CfzZWU74PQ1WIDnwUpA5o2bWJaGlLOy0dP3uMB3WlI1 ySMtxPaphysQ9TtGVIa7VQe+++d7Y1/En3yPmTh7MsVtwmRstJ0nobbFmfztMRY70UW4 LyXe8t09GrQJcy4xmACqEY0gkqDZlRBaScnL9uA89QlXMIOZOoX8FGl5EynP8w5DRDzh o6wlajX1OHBZHvECquCG9h9VA7D40udGUdYPyeU/IHlXPgaXKM5u9stzMqn6tC1vw3a1 qZxQ== X-Forwarded-Encrypted: i=1; AJvYcCWTztPxKEzP5d35WrqrTNOMioYYDgjYZ7N2EllNKyDLGBT9y7v8gO4ofp2letQ947OeFgTwXkd3cHB6iy+tO8jUE7qJgqmqdf3tlykDsJdW2CM08eunl+eH5NoWGauT X-Gm-Message-State: AOJu0YyJ7LJdH+NYKjdqjUlmvyCH1/4f4OC+F+tggBXWwydtYP7IQhGM VYVVA+GyR/b/x72V2HRFJZnuc0GJQ4xwD/2CGFZtYEI/x1SkjuxaCkJdXBkkxG15h/UXKVdJeWG FfasqHLhURTYlPdgM+1JBIIC1UN4= X-Google-Smtp-Source: AGHT+IEPBvWAD+PLiwwLs1PHMYhna9E0sqSrE+8a6qJ8lZANUIxMnkBDCuxRLTqKYlx1yxfZq+jaaGEoYRSxiGExooc= X-Received: by 2002:a17:90b:1995:b0:2a2:510f:fa4b with SMTP id mv21-20020a17090b199500b002a2510ffa4bmr3378959pjb.10.1712086916950; Tue, 02 Apr 2024 12:41:56 -0700 (PDT) MIME-Version: 1.0 References: <5db417d9-52e9-e701-2644-5802148e8339@idea> In-Reply-To: <5db417d9-52e9-e701-2644-5802148e8339@idea> From: Pilar Latiesa Date: Tue, 2 Apr 2024 21:41:45 +0200 Message-ID: Subject: Re: [PATCH] libstdc++: Allow adjacent __maybe_present_t to overlap To: Patrick Palka Cc: Jonathan Wakely , libstdc++@gcc.gnu.org, gcc-patches@gcc.gnu.org Content-Type: text/plain; charset="UTF-8" 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,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: > > This is subjectively horrible and, more objectively, would create > > longer mangled names and additional RTTI. > Yeah, it's a neat trick but probably not appropriate to use within the > standard library. I understand. I was genuinely curious about whether this would do the trick. In fact, if I'm not mistaken, the whole thing could be simplified to: template using __maybe_present_t = __conditional_t<_Present, _Tp, _Absent>;