[Bug c++/40682] New: Require direct binding of short-lived references to rvalues

[dragan at plusplus dot co dot yu]

In a recent discussion on comp.std.c++
"rvalue references returned from a function",
as pointed by Niels Dekker and Micael Dark,
a defect report:

  http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#391

was accepted into C++0x WP. This has a significant impact on GCC.

The current behavior also creates a problem with the following:

  struct R {
    R(const R &);
  };

  R && func();

  int main() {
    R const & r1 = func();
    R &&      r2 = func();
  }

Both r1 and r2 will be bound to a temporary which will be
created by copying (or if available - moving) the returned
rvalue. This is invalid according to the mentioned changes.


-- 
           Summary: Require direct binding of short-lived references to
                    rvalues
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dragan at plusplus dot co dot yu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40682