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* [Bug c++/98938] New: throw calls move constructor
@ 2021-02-02 18:47 njormrod at fb dot com
2021-02-04 10:39 ` [Bug c++/98938] " redi at gcc dot gnu.org
2021-02-04 10:55 ` redi at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: njormrod at fb dot com @ 2021-02-02 18:47 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98938
Bug ID: 98938
Summary: throw calls move constructor
Product: gcc
Version: 10.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: njormrod at fb dot com
Target Milestone: ---
Throwing invokes the move constructor instead of the copy constructor.
Demonstration of move-constructor in godbolt: https://gcc.godbolt.org/z/zhjv5z
Demonstration of copy-constructor using clang: https://gcc.godbolt.org/z/E3MEef
>From 14.2 Throwing an exception [except.throw]: "Throwing an exception
copy-initializes (9.4, 11.4.5.3) a temporary object, called the exception
object."
Code (as used in godbolt):
```
#include <exception>
struct A : std::exception {
A(int* q) : p(q) {}
A(const A& a) : p(a.p) { *p = 12345; }
A(A&& a) : p(a.p) { *p = 56789; }
int* p;
};
int foo() {
int i = 10;
A a(&i);
try {
throw a;
} catch (A&) {}
return i;
}
```
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/98938] throw calls move constructor
2021-02-02 18:47 [Bug c++/98938] New: throw calls move constructor njormrod at fb dot com
@ 2021-02-04 10:39 ` redi at gcc dot gnu.org
2021-02-04 10:55 ` redi at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: redi at gcc dot gnu.org @ 2021-02-04 10:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98938
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
.
*** This bug has been marked as a duplicate of bug 57533 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/98938] throw calls move constructor
2021-02-02 18:47 [Bug c++/98938] New: throw calls move constructor njormrod at fb dot com
2021-02-04 10:39 ` [Bug c++/98938] " redi at gcc dot gnu.org
@ 2021-02-04 10:55 ` redi at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: redi at gcc dot gnu.org @ 2021-02-04 10:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98938
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
With GCC trunk there's a copy, since:
commit 1722e2013f05f1f1f99379dbaa0c0df356da731f
Author: Jason Merrill
Date: Tue Jul 21 05:19:49 2020
c++: Implement C++20 implicit move changes. [PR91427]
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-02-02 18:47 [Bug c++/98938] New: throw calls move constructor njormrod at fb dot com
2021-02-04 10:39 ` [Bug c++/98938] " redi at gcc dot gnu.org
2021-02-04 10:55 ` redi at gcc dot gnu.org
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