http://llvm.org/bugs/show_bug.cgi?id=16448
Bug ID: 16448
Summary: DR1358: if an instantiated constexpr function template
doesn't satisfy the constexpr requirements, we should
not allow it to be called in a constant expression
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Example:
struct S { virtual int f(); };
template<typename T> struct X : T {
constexpr X() {}
double d = 0.0;
constexpr int f() { return sizeof(T); }
};
constexpr X<X<S> > xxs;
constexpr const X<S> *p = &xxs;
static_assert(p->f() == sizeof(X<S>), "");
Clang accepts this but the static_assert fails, because the call is made
non-virtually. Per core issue DR1358, evaluation of a call to a constexpr
constructor temploid whose specialization does not obey the constexpr rules is
supposed to fail.
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