Trait num_traits::cast::NumCast [−][src]
pub trait NumCast: Sized + ToPrimitive { fn from<T: ToPrimitive>(n: T) -> Option<Self>; }
An interface for casting between machine scalars.
Required methods
fn from<T: ToPrimitive>(n: T) -> Option<Self>
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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
impl NumCast for u8
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impl NumCast for u8
[src]fn from<N: ToPrimitive>(n: N) -> Option<u8>
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impl NumCast for u16
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impl NumCast for u16
[src]fn from<N: ToPrimitive>(n: N) -> Option<u16>
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impl NumCast for u32
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impl NumCast for u32
[src]fn from<N: ToPrimitive>(n: N) -> Option<u32>
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impl NumCast for u64
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impl NumCast for u64
[src]fn from<N: ToPrimitive>(n: N) -> Option<u64>
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impl NumCast for u128
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impl NumCast for u128
[src]fn from<N: ToPrimitive>(n: N) -> Option<u128>
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impl NumCast for usize
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impl NumCast for usize
[src]fn from<N: ToPrimitive>(n: N) -> Option<usize>
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impl NumCast for i8
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impl NumCast for i8
[src]fn from<N: ToPrimitive>(n: N) -> Option<i8>
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impl NumCast for i16
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impl NumCast for i16
[src]fn from<N: ToPrimitive>(n: N) -> Option<i16>
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impl NumCast for i32
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impl NumCast for i32
[src]fn from<N: ToPrimitive>(n: N) -> Option<i32>
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impl NumCast for i64
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impl NumCast for i64
[src]fn from<N: ToPrimitive>(n: N) -> Option<i64>
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impl NumCast for i128
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impl NumCast for i128
[src]fn from<N: ToPrimitive>(n: N) -> Option<i128>
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impl NumCast for isize
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impl NumCast for isize
[src]fn from<N: ToPrimitive>(n: N) -> Option<isize>
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impl NumCast for f32
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impl NumCast for f32
[src]fn from<N: ToPrimitive>(n: N) -> Option<f32>
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impl NumCast for f64
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impl NumCast for f64
[src]fn from<N: ToPrimitive>(n: N) -> Option<f64>
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impl<T: NumCast> NumCast for Wrapping<T>
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impl<T: NumCast> NumCast for Wrapping<T>
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