pub trait NumCast: ToPrimitive {
    fn from<T>(n: T) -> Option<Self>
        T: ToPrimitive
; }
Expand description

An interface for casting between machine scalars.

Required Methods

Creates a number from another value that can be converted into a primitive via the ToPrimitive trait. If the source value cannot be represented by the target type, then None is returned.

A value can be represented by the target type when it lies within the range of scalars supported by the target type. For example, a negative integer cannot be represented by an unsigned integer type, and an i64 with a very high magnitude might not be convertible to an i32. On the other hand, conversions with possible precision loss or truncation are admitted, like an f32 with a decimal part to an integer type, or even a large f64 saturating to f32 infinity.

Implementations on Foreign Types