http://llvm.org/bugs/show_bug.cgi?id=14123
Bug #: 14123
Summary: union member with a user-declared, but not
user-provided, trivial constructor implicitly deletes
unions default constructor
Product: clang
Version: trunk
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: C++11
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The following valid code is rejected
// clang++ -std=c++11 test.cpp
union U {
struct S {
S() = default;
} s;
} u;
error: call to implicitly-deleted default constructor of 'union U'
} u;
^
note: default constructor of 'U' is implicitly deleted because variant field
's' has a non-trivial default constructor
} s;
^
Clang incorrectly determines that the user declared (but not user provided)
constructor is non-trivial.
Interestingly, the following similar code is not rejected:
struct S {
S() = default;
};
union U {
S s;
} u;
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