A generic interface for casting between machine scalars with the
as operator, which admits narrowing and precision loss.
Implementers of this trait
AsPrimitive should behave like a primitive
numeric type (e.g. a newtype around another primitive), and the
intended conversion must never fail.
let three: i32 = (3.14159265f32).as_(); assert_eq!(three, 3);
In Rust versions before 1.45.0, some uses of the
as operator were not entirely safe.
In particular, it was undefined behavior if
a truncated floating point value could not fit in the target integer
let x: u8 = (1.04E+17).as_(); // UB
Convert a value to another, using the