http://llvm.org/bugs/show_bug.cgi?id=20625
Bug ID: 20625
Summary: static constexpr member function of a local struct in
a function template is instantiated too late
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:
template <typename T>
void F() {
struct Num {
static constexpr int Get() { return 42; }
};
constexpr int n = Num::Get();
}
int main() {
F<int>();
}
Error message:
a.cc:6:17: error: constexpr variable 'n' must be initialized by a constant
expression
constexpr int n = TNum::Get();
^ ~~~~~~~~~~~
a.cc:10:3: note: in instantiation of function template specialization
'F<int>'
requested here
F<int>();
^
a.cc:6:21: note: undefined function 'Get' cannot be used in a constant
expression
constexpr int n = TNum::Get();
^
a.cc:4:26: note: declared here
static constexpr int Get() { return 42; }
^
1 error generated.
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