http://llvm.org/bugs/show_bug.cgi?id=13492
Bug #: 13492
Summary: Explicitly defaulted constructors are not constexprs,
yet are treated as such for constant creation
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 snippets should provide the same error, but don't in clang (ToT):
struct A {
};
struct B {
B() = default;
};
struct C {
C() {} // Automatically gains constexpr since it qualifies
};
int main( void ) {
const A a; // Error
const B b; // Error
const C c; // OK
return 0;
}
This is because:
dcl.fct.def.default/2:
An explicitly-defaulted function may be declared constexpr only if it would
have been implicitly declared as constexpr
and
class.ctor/5:
An implicitly-declared default constructor is an inline public member of its
class.
class.ctor/6:
If that user-written default constructor would satisfy the requirements of a
constexpr constructor, the implicitly-defined default constructor is constexpr.
So only user-written default constructors gain automatic constexpr magic.
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