Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.c++ > #71146
| From | Ralf Goertz <me@myprovider.invalid> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: std::copy with std::ostream_iterator<std::array...> |
| Date | 2020-01-05 16:06 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <qusu17$ld9$1@dont-email.me> (permalink) |
| References | <qukdjv$fco$1@dont-email.me> <slrn3flsr121tl.4k8.ike@sdf.lonestar.org> |
Am Sat, 4 Jan 2020 21:46:28 -0000 (UTC)
schrieb Ike Naar <ike@sdf.lonestar.org>:
> On 2020-01-02, Ralf Goertz <me@myprovider.invalid> wrote:
> > struct Foo {
> > int i,j;
> > bool operator<(const struct Foo &r) const { //needed for set
> > if (i<r.i) return true;
> > return j<r.j;
>
> This looks suspect.
> Do you want (2,1) to be less than (1,2) ? if you want to define a
> lexicographical order on (i,j), the comparison should be
>
> return i<r.i || (i==r.i && j<r.j);
Yeah, I know. I did get it wrong but I only defined the operator in
order to be able to use Foo with the set. I was puzzled by the compile
errors with array. I thought that the fact that array is templated could
be the reason. So I tried the non-templated Foo and the errors were
gone. I would never have guessed that the namespace was the problem.
Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
std::copy with std::ostream_iterator<std::array...> Ralf Goertz <me@myprovider.invalid> - 2020-01-02 10:37 +0100
Re: std::copy with std::ostream_iterator<std::array...> Paavo Helde <myfirstname@osa.pri.ee> - 2020-01-02 12:27 +0200
Re: std::copy with std::ostream_iterator<std::array...> Bo Persson <bo@bo-persson.se> - 2020-01-02 12:26 +0100
Re: std::copy with std::ostream_iterator<std::array...> Ralf Goertz <me@myprovider.invalid> - 2020-01-02 16:10 +0100
Re: std::copy with std::ostream_iterator<std::array...> James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-02 23:13 -0500
Re: std::copy with std::ostream_iterator<std::array...> Ralf Goertz <me@myprovider.invalid> - 2020-01-03 07:49 +0100
Re: std::copy with std::ostream_iterator<std::array...> James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-03 08:30 -0500
Re: std::copy with std::ostream_iterator<std::array...> Bo Persson <bo@bo-persson.se> - 2020-01-03 15:09 +0100
Re: std::copy with std::ostream_iterator<std::array...> Ike Naar <ike@sdf.lonestar.org> - 2020-01-04 21:46 +0000
Re: std::copy with std::ostream_iterator<std::array...> Ralf Goertz <me@myprovider.invalid> - 2020-01-05 16:06 +0100
Re: std::copy with std::ostream_iterator<std::array...> Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-01-05 18:24 +0000
Re: std::copy with std::ostream_iterator<std::array...> Öö Tiib <ootiib@hot.ee> - 2020-01-05 10:56 -0800
Re: std::copy with std::ostream_iterator<std::array...> Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-01-05 19:55 +0000
csiph-web