Trait num_traits::cast::AsPrimitive
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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.
Examples
let three: i32 = (3.14159265f32).as_();
assert_eq!(three, 3);Safety
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
type (#10184).
ⓘ
let x: u8 = (1.04E+17).as_(); // UB