From: Marc Glisse <marc.glisse@inria.fr>
To: Sidney Marshall <sidneym@frontiernet.net>
Cc: gcc-help@gcc.gnu.org
Subject: Re: C++11 - Parameter pack question
Date: Sat, 16 Aug 2014 07:12:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.11.1408160907210.1729@laptop-mg.saclay.inria.fr> (raw)
In-Reply-To: <201408160114.s7G1EKDO087976@nef2.ens.fr>
On Fri, 15 Aug 2014, Sidney Marshall wrote:
> The following code compiles and runs correctly but gives a warning:
>
> ----------------------------------------
> #include<iostream>
>
> using namespace std;
>
> template<class T>
> T sum(T value) {
> return value;
> }
>
> template<class T, class ... U>
> auto sum(T value, U ... values) {
> return value + sum(values ...);
> }
>
> int main() {
> cout << sum(1, 2, 4.6) << endl;
> cout << sum(1, "abcde", 2) << endl;
> }
> --------------------------------------
>
> $ g++ -std=c++11 pack.cpp
> pack.cpp:11:31: warning: â??sumâ?? function uses â??autoâ?? type specifier
> without trailing return type [enabled by default]
> auto sum(T value, U ... values) {
The warning should probably specify that this is a C++14 feature. You
should be compiling with -std=c++1y.
--
Marc Glisse
next parent reply other threads:[~2014-08-16 7:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <201408160114.s7G1EKDO087976@nef2.ens.fr>
2014-08-16 7:12 ` Marc Glisse [this message]
[not found] ` <alpine.DEB.2.11.1408160907210.1729@laptop-mg.saclay.inria. fr>
2014-08-17 2:28 ` Sidney Marshall
2014-08-17 2:28 ` Sidney Marshall
2014-08-16 1:14 Sidney Marshall
-- strict thread matches above, loose matches on Subject: below --
2014-08-16 1:14 Sidney Marshall
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