Initializing floating point types with explicit mantisa and exponent

[Nicholas Wilson via Digitalmars-d-learn]

On Tuesday, 17 January 2017 at 00:08:24 UTC, Nordlöw wrote:
> How do I best initialize a D double to an exact mantissa and 
> exponent representation?
>
> I'm specifically interested in
>
>     2^^i for all i in [min_exp, max_exp]

See

std.bitmanip : FloatRep , DoubleRep;