https://llvm.org/bugs/show_bug.cgi?id=31051
Bug ID: 31051
Summary: __compressed_pair doesn't correctly forward
constructor arguments.
Product: libc++
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: e...@efcs.ca
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Classification: Unclassified
__compressed_pair takes it's arguments by value, which incurs an additional
copy or move. This needs to be fixed.
Reproducer:
#include <memory>
#include <cassert>
int A_moved = 0;
struct A {
A() = default;
A(A const&) = default;
A(A&&) { ++A_moved; };
};
int main() {
std::__compressed_pair<A, int> p(A{});
assert(A_moved == 3); // Assert passes
assert(A_moved == 1); // Assert fails
}
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
