[Bug c++/52521] [C++11] user defined literals and order of declaration

[marc.glisse at normalesup dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52521

--- Comment #7 from Marc Glisse <marc.glisse at normalesup dot org> 2012-03-16 
19:39:14 UTC ---
(In reply to comment #6)
> constexpr long double operator"" _degrees(long double d)
> {
>    return d * 0.0175;
> }
> 
> int main()
> {
>    long double pi = 180_degrees;
>    std::cout << pi << std::endl;
> }

There is no dot in 180, so it is looking for an unsigned long long overload
(which you could provide). 180._degrees works.