public inbox for gcc-prs@sourceware.org
help / color / mirror / Atom feed
From: bangerth@dealii.org
To: a.shipman@bom.gov.au, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
	nobody@gcc.gnu.org
Subject: Re: c++/9987: Failure to call a copy constructor with complex templated member functions.
Date: Fri, 07 Mar 2003 14:55:00 -0000	[thread overview]
Message-ID: <20030307145556.30146.qmail@sources.redhat.com> (raw)

Synopsis: Failure to call a copy constructor with complex templated member functions.

State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Fri Mar  7 14:55:56 2003
State-Changed-Why:
    Not a bug. If you have
      template <class T> class X {
        template <class U> X (const X<U> &);
      }
      X<int> x_int1;
      X<int> x_int2(x_int1);
      X<char> x_char(x_int1);
    then the templated copy constructor is called in the
    initialization of x_char, but _not_ in that of x_int2. For
    the latter, the compiler synthesizes the byte-copy default
    copy constructor. If you want to have a user defined
    copy constructor for the case T==U, then you have to declare
    and implement it. Doing so in your program makes the SegFault
    go away (just checked that).
    
    Regards
      Wolfgang

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9987


             reply	other threads:[~2003-03-07 14:55 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-03-07 14:55 bangerth [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-03-07  8:16 a.shipman

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20030307145556.30146.qmail@sources.redhat.com \
    --to=bangerth@dealii.org \
    --cc=a.shipman@bom.gov.au \
    --cc=gcc-bugs@gcc.gnu.org \
    --cc=gcc-gnats@gcc.gnu.org \
    --cc=gcc-prs@gcc.gnu.org \
    --cc=nobody@gcc.gnu.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).