Split Real / Float into Mantissa, Exponent, and Base

[Jonathan M. Wilbur via Digitalmars-d-learn]

I have tried to come up with a good way to get the mantissa, 
exponent, and base from a real number, and I just can't come up 
with a good cross-platform way of doing it. I know about 
std.math.frexp(), but that function only gives you another real 
as the mantissa. I need an integral mantissa, exponent, and base.

Is there either (1) a crafty, cross-platform way of doing this or 
(2) a function in a standard library that does this that I 
somehow missed? If there is no such function, what are your 
thoughts on me implementing such a thing and submitting it to 
Phobos, probably similar to how frexp is implemented (elseifs for 
each FP format)?