extern(C) bool function type?

[bearophile]

Charles Hixson:

> Does anyone know:
> If an extern(c) function is defined as returning a bool, does D 
> handle the conversion automatically into true and false?  
> Should it be defined as returning  an int?  On a 64 bit 
> machine?  Does this depend on the compiler used to compile the 
> library?  int32_t? int_64_t?
>
> Is this portable or non-portable?

A D bool is a C99 uint8_t that has values just 0 or 1.

If your uint8_t contains a value x > 1, in many cases this works, 
but some D code relying on the standard values of a D boolean 
breaks (like when you sum bool values in D, to count the true 
ones).

D doesn't handle those conversions beside the narrowing or 
extension of bit-width lengths.

Bye,
bearophile