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From: "rs2740 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/65631] New: seed_seq should not be copyable
Date: Mon, 30 Mar 2015 17:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65631

            Bug ID: 65631
           Summary: seed_seq should not be copyable
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rs2740 at gmail dot com

>>From http://stackoverflow.com/q/29350040/2756719, repro:

#include <random>

int main(int, char **)
{
  std::seed_seq seed1{1337, 42};
  std::seed_seq seed2(seed1);
  std::seed_seq seed3 = seed2;
  return 0;
}

Per the class synopsis in [rand.util.seedseq], the copy constructor and
assignment operator of seed_seq are deleted:

// no copy functions
seed_seq(const seed_seq& ) = delete;
void operator=(const seed_seq& ) = delete;

But the above code, incorrectly, compiles using libstdc++.