220 34921 <73c98deb-3054-4652-8fca-97f0939ed6d7@isocpp.org> article Path: news.gmane.org!.POSTED!not-for-mail From: euloanty@live.com Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Thoughts on more methods towards containers in the future Date: Sat, 14 Oct 2017 10:04:32 -0700 (PDT) Lines: 94 Approved: news@gmane.org Message-ID: <73c98deb-3054-4652-8fca-97f0939ed6d7@isocpp.org> References: <0cc942cf-a217-4175-98b0-b466ac224dc7@isocpp.org> <7e04a500-ba3a-432a-a844-7d4def1fb739@isocpp.org> <5c1bc3ef-c3a2-4406-8a7a-f82e12155386@isocpp.org> <69a588d5-de2a-4be2-8add-9685d0b9a230@isocpp.org> <405f3ea9-d886-4c3f-9543-a276f8214974@isocpp.org> <02fc9853-e388-4eb3-8db3-de4e0a689056@isocpp.org> <20171014160909.GB1546@fukushima.lysator.liu.se> Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_Part_14207_2112438522.1508000672902" X-Trace: blaine.gmane.org 1508000682 10890 195.159.176.226 (14 Oct 2017 17:04:42 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 14 Oct 2017 17:04:42 +0000 (UTC) Cc: euloanty@live.com To: ISO C++ Standard - Future Proposals Original-X-From: std-proposals+bncBDPYX6PYRQNBBIMHRHHQKGQEMMQYUVI@isocpp.org Sat Oct 14 19:04:36 2017 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-ua0-f197.google.com ([209.85.217.197]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e3PrO-000104-WC for gclcip-std-proposals@m.gmane.org; Sat, 14 Oct 2017 19:04:27 +0200 Original-Received: by mail-ua0-f197.google.com with SMTP id 10sf5311817uav.16 for ; Sat, 14 Oct 2017 10:04:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isocpp-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version:x-original-sender:reply-to:precedence:mailing-list :list-id:list-post:list-help:list-archive:list-subscribe :list-unsubscribe; bh=b2MjKtdf/IittuwUHgI+yGPro5Q8apx7mPy9Dqe13gw=; b=XkCWCTEpSX6EPwYWZ0cd3A2uBBPaIVFck4EA7aTIBGmEDuGVn+PjlYjCbVy0CrDdiT fgiM6mQ+9MYocYBLh0GYTiOfV3m8CBckaPM7BJChoIuwqu1JlwgGV7vNTKRd8s8imeDW zog5xlqTwURYLuyc/pR8qoRV2z800twwGINQ8lC63EbFlHjNQDaJClkaEWevlsutG38K zwD2Qss6VEU3cpTXafOHNT+KrvZ/bHxSSRrRmvXIQRs841e0NnOmyVMR5ye1T6DWuZne qf6ba0/QVcI1gLYkOBWcOEnUHsjSGx2qiizQ391q2NAn8ZehNpMmWWZnnV+uSfNOJvxk qdXg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:message-id:in-reply-to :references:subject:mime-version:x-original-sender:reply-to :precedence:mailing-list:list-id:x-spam-checked-in-group:list-post :list-help:list-archive:list-subscribe:list-unsubscribe; bh=b2MjKtdf/IittuwUHgI+yGPro5Q8apx7mPy9Dqe13gw=; b=k/V/XkWVyyLkhy6IuEhWpD4pY/DJjaYPmIuAsDjqTzPyfckhBAEkc2GRZqVcfaPgLi ubTzV+G59att8YDJGTfTgK4+pne1BTjtEW3tnbkwhd6Kcrwih0PpPbXg4PdzuZ9/unQr FL45RX3HvCXxnf790jubp7wGu/KR1ceamtYK+5JzYM1++YI+cv7cILJKBOf+gLnl9/Kt 9/qvlqiUw0bG6VkrrYt1CHq8X8lSBa+hOSet3EEDp9Y8Khd5VvnPhLRrTjQsvdKAtMbq ZP+dfQqjK6C7mOGc0VYTeB95y20PxpiPml/zZOShCri9lfM314oQbGrIyyKHhDW7KZ4H 88eQ== X-Gm-Message-State: AMCzsaVIROC+cn/FQ6C7PvnVC8nk0lGm3j9yhXhKrMs2ad6Z7l/UInq6 XSVO5KXgai5EAVHt1UVj0nTtUA== X-Google-Smtp-Source: AOwi7QDUkwuqVDIyka75IS5pbD4ob06ity9UUVoQaMPdI9aS3CImdE7oqEnRKgMCcq8fYJ8z8tKEgQ== X-Received: by 10.31.181.15 with SMTP id e15mr2570819vkf.67.1508000674346; Sat, 14 Oct 2017 10:04:34 -0700 (PDT) X-BeenThere: std-proposals@isocpp.org Original-Received: by 10.176.86.23 with SMTP id y23ls2294513uaa.7.gmail; Sat, 14 Oct 2017 10:04:33 -0700 (PDT) X-Received: by 10.31.7.137 with SMTP id 131mr315809vkh.5.1508000673394; Sat, 14 Oct 2017 10:04:33 -0700 (PDT) In-Reply-To: <20171014160909.GB1546@fukushima.lysator.liu.se> X-Original-Sender: euloanty@live.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:34921 Archived-At: ------=_Part_14207_2112438522.1508000672902 Content-Type: multipart/alternative; boundary="----=_Part_14208_1591891492.1508000672902" ------=_Part_14208_1591891492.1508000672902 Content-Type: text/plain; charset="UTF-8" It is undefined behavior. So I can get my errors from it. On Saturday, October 14, 2017 at 12:09:14 PM UTC-4, Magnus Fromreide wrote: > > On Sat, Oct 14, 2017 at 08:44:42AM -0700, eulo...@live.com > wrote: > > For example. I want to test whether I reserve the exactly correct > capacity > > for vector. > > > > > > vector v; > > v.reserve(100000); > > //emplace_back for 100001 times. I cant find mistakes. > > > > > > vector v; > > v.reserve(100000); > > //non check emplace_back for 100001 times > > This program will collapse. And I can know I've made mistake here. > > No, that program have undefined behaviour so you do not know what will > happen. > > /MF > -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/73c98deb-3054-4652-8fca-97f0939ed6d7%40isocpp.org. ------=_Part_14208_1591891492.1508000672902 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
It is undefined behavior. So I can get my errors from it.<= br>
On Saturday, October 14, 2017 at 12:09:14 PM UTC-4, Magnus Fromreide= wrote:
On Sat, Oct 14, 2017 at= 08:44:42AM -0700, eulo...@live.com wrote:
> For example. I want to test whether I reserve the exactly correct = capacity=20
> for vector.
>=20
>=20
> vector<int> v;
> v.reserve(100000);
> //emplace_back for 100001 times. I cant find mistakes.
>=20
>=20
> vector<int> v;
> v.reserve(100000);
> //non check emplace_back for 100001 times
> This program will collapse. And I can know I've made mistake h= ere.

No, that program have undefined behaviour so you do not know what will = happen.

/MF

--
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