[PATCH 03/14] c++: Implement __is_floating_point built-in trait

[Jason Merrill]

On 1/10/24 04:22, Ken Matsui wrote:
> +/* Return true if T is a floating point type.  With __STRICT_ANSI__, __float128
> +   is not a floating point type.  However, _Float128 is a floating point type.

My comment about __is_integral again, but more so; if we support 
_Float128, why not __float128?  And what about __bfloat16_t?

Jason