Clang auto variable template error

Question

I went to see if you can use auto in a variable template declaration.

template <typename T>
auto F = T{};

Good, but as soon as you try to use it, clang craps.

int f = F<int>; // error: cannot initialize a variable of type 'int' with an lvalue of type 'auto'
auto f = F<int>; // Stacktrace
decltype(F<int>) f = F<int>; // StackFace
std::cout << std::is_same<int, decltype(F<int>)>::value; // false
std::cout << typeid(decltype(F<int>)).name(); // Stacktrace
std::cout << std::is_same<decltype(F<int>), decltype(F<int>)>::value; // true

Any combination decltype(auto), autodoes not work, although she says that autois an lvalue.

int f = static_cast<int>(F<int>); // error: static_cast from 'auto' to 'int' is not allowed

I had never seen automatic action before. Is it due to template variables or is it because clang handles auto?

Answer 1

This seems to be addressed in the latest version clang; putting this in a file and calling

clang++ -std=c++1y test.cpp

does not give errors.

kevinushey@Kevin-MBP:~$ clang++ -v
clang version 3.5 (trunk 201469)
Target: x86_64-apple-darwin13.0.0
Thread model: posix