Re: [boost] [math] Support for libquadmath/ __float128

Of course, I made a mistake. You need to qualify the return value with constexpr.

template<typename built_in_float_type> constexpr built_in_float_type const_pi() { // This is a true compile-time constant. return built_in_float_type(3.14159265358979323846264338327950288419716939937511); }

That only gives you a double precision constant irrespective of the cast, John.