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* [Bug c++/67200] New: Copy elision and implicit move in return performed in cases not allowed by standard
@ 2015-08-13 5:25 rs2740 at gmail dot com
2015-08-13 7:59 ` [Bug c++/67200] " redi at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: rs2740 at gmail dot com @ 2015-08-13 5:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67200
Bug ID: 67200
Summary: Copy elision and implicit move in return performed in
cases not allowed by standard
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rs2740 at gmail dot com
Target Milestone: ---
Consider:
struct A {
A() = default;
A(const A&) = delete;
A(A&&) = default;
};
A f() {
A a;
return true ? a : a;
}
This code is ill-formed; `true ? a : a` is an lvalue of type `A`; it neither
qualifies for copy elision under [class.copy]/p31 (it is not "the name of a
nonvolatile
automatic object") nor for implicit moving under [class.copy]/p32 (it's not an
id-expression, either). Therefore, overload resolution should select the copy
constructor, which in the above example is deleted.
GCC compiles this code and in fact elides a move.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/67200] Copy elision and implicit move in return performed in cases not allowed by standard
2015-08-13 5:25 [Bug c++/67200] New: Copy elision and implicit move in return performed in cases not allowed by standard rs2740 at gmail dot com
@ 2015-08-13 7:59 ` redi at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: redi at gcc dot gnu.org @ 2015-08-13 7:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67200
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-08-13
Ever confirmed|0 |1
^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-08-13 5:25 [Bug c++/67200] New: Copy elision and implicit move in return performed in cases not allowed by standard rs2740 at gmail dot com
2015-08-13 7:59 ` [Bug c++/67200] " redi at gcc dot gnu.org
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