https://bugs.llvm.org/show_bug.cgi?id=39362
Bug ID: 39362
Summary: const-default-constructible class has deleted
constructor
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: ztur...@google.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
https://godbolt.org/z/s6Hjm0
struct A {
#ifdef DEFAULT
A() = default; // error
#else
A(){}; //ok
#endif
};
struct b {
const A a;
};
struct c : b {
c(){}
};
Per Richard Smith, this is a bug in the C++ standard, because
http://eel.is/c++draft/class.default.ctor#2.4 and
http://eel.is/c++draft/dcl.init#def:const-default-constructible conflict with
each other. Clang conforms to the written behavior (constructor is deleted)
while other compilers conform to the intended behavior (class is
const-default-constructible).
Clang should conform to the intended behavior, even if the standard does not
(yet) reflect this.
This may or may not be related to Bug 33039.
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