[knodi123]

I chuckled, but presumably it's useful for applications where you want data types to take up the same amount of space, like for matrices or database columns? Or maybe where you coerce different data types into boolean? The language offers WordBool and ByteBool too, so they're pretty consistent. And AFAIK, there aren't any languages where you can specifically allocate only a single bit for a single boolean.

[nneonneo]

You kind of can in C with bit size specifications on struct members, but you’ll still face the problem that C’s minimum alignment is one byte - so a struct containing a single 1-bit field will still occupy a byte in memory. However, it does let you “allocate” different bits within a byte for different member fields.

C++ has vector<bool>, which is supposed to be an efficient bit-packed vector of Booleans, but due to C++ constraints it doesn’t quite behave like a container (unlike other vector<T>s). Of course, if you make a vector<bool> of a single bit, that’s still going to occupy much more than one bit in memory.

There are plenty of hardware specification languages where it’s trivial to “allocate” one bit, but those aren’t allocating from the heap in a traditional sense. (Simulators for these languages will often efficiently pack the bits in memory, but that’s more of an implementation detail than a language guarantee).