Size of D bool vs size of C++ bool

[Jeremy DeHaan via Digitalmars-d-learn]

I'm trying to do some binding code, and I know that C++ bool 
isn't defined to be a specific size like D's bool. That said, can 
I assume that the two are the same size on the most platforms?

The only platforms I'm really interested in are Windows, Linux, 
OSX, iOS, FreeBSD, Android. The only thing that might throw me 
off is if there are some things that Linux or FreeBSD target 
where this is not the case, but these machines are probably out 
of the scope of my project.