Initializing floating point types with explicit mantisa and exponent

[Nordlöw via Digitalmars-d-learn]

On Tuesday, 17 January 2017 at 16:40:57 UTC, kinke wrote:
> If it doesn't have to be D ;), it can be as simple as 
> `core.stdc.math.ldexp(1, exponent)`. No CTFE though.

Isn't it a simple as

     2.0^^exponent

?