220 24126 <53952014.4UIbchGS4l@tjmaciei-mobl4> article Path: news.gmane.org!not-for-mail From: Thiago Macieira Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: lambda template? 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[2a01:4f8:d13:f81:21c:14ff:fe01:12a3]) by mx.google.com with ESMTP id k124si20235842wmf.79.2016.02.01.22.33.23 for ; Mon, 01 Feb 2016 22:33:23 -0800 (PST) Received-SPF: pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) client-ip=2a01:4f8:d13:f81:21c:14ff:fe01:12a3; Original-Received: from tjmaciei-mobl4.localnet (unknown [IPv6:2601:1c0:5803:81c9:bce6:2840:8111:8dba]) by gondolin.macieira.info (Postfix) with ESMTPSA id C764C11A430 for ; Mon, 1 Feb 2016 22:33:22 -0800 (PST) User-Agent: KMail/4.14.10 (Linux/4.3.3-6-default; KDE/4.14.15; x86_64; ; ) In-Reply-To: <678fc289-199f-425c-bdad-3499190d770f@isocpp.org> X-Original-Sender: thiago@macieira.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of thiago@macieira.org designates 2a01:4f8:d13:f81:21c:14ff:fe01:12a3 as permitted sender) smtp.mailfrom=thiago@macieira.org Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org 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:24126 Archived-At: On Monday 01 February 2016 20:03:32 =EC=9C=A4=ED=9B=88=EB=82=A8 wrote: > #include > #include > // Move or Copy Check > struct CheckString { > std::string data_{ "hello" }; > CheckString() =3D default; > CheckString(const CheckString& rhs) : data_{ rhs.data_ } { > std::cout << "copying\n"; > } >=20 > CheckString(CheckString&& rhs) : data_{ std::move(rhs.data_) } { > std::cout << "moving\n"; > } > }; >=20 > void f(CheckString ts1, CheckString ts2, CheckString arg1, CheckString > arg2) { > } >=20 > //#case 1 > template > auto test(TS&&... ts1) { > return [&ts1...](auto&&... args) mutable { > // error 'TS': parameter pack must be expanded in this context > // TS type not capture. just value capture. > return f(std::forward(ts1)..., std::forward(args)...) > }; > } No error here, Clang 3.7, GCC 5.3, ICC 16.0. > int main() { > CheckString ts1, ts2, arg1, arg2; > auto fn =3D test(ts1, std::move(ts2)); > fn(arg1, std::move(arg2)); > // ts2, arg2 ->moving > // ts1, arg1 ->copying > } >=20 > Something seems to be possible also for other purposes, a variety of uses= .. Please explain with words what this is supposed to do. And considering case= 1=20 works, why do we need cases 2 or 3? --=20 Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org Software Architect - Intel Open Source Technology Center PGP/GPG: 0x6EF45358; fingerprint: E067 918B B660 DBD1 105C 966C 33F5 F005 6EF4 5358 --=20 ---=20 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 e= mail to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. Visit this group at https://groups.google.com/a/isocpp.org/group/std-propos= als/. .