Trait num_traits::cast::FromPrimitive [−][src]
pub trait FromPrimitive: Sized { fn from_i64(n: i64) -> Option<Self>; fn from_u64(n: u64) -> Option<Self>; fn from_isize(n: isize) -> Option<Self> { ... } fn from_i8(n: i8) -> Option<Self> { ... } fn from_i16(n: i16) -> Option<Self> { ... } fn from_i32(n: i32) -> Option<Self> { ... } fn from_i128(n: i128) -> Option<Self> { ... } fn from_usize(n: usize) -> Option<Self> { ... } fn from_u8(n: u8) -> Option<Self> { ... } fn from_u16(n: u16) -> Option<Self> { ... } fn from_u32(n: u32) -> Option<Self> { ... } fn from_u128(n: u128) -> Option<Self> { ... } fn from_f32(n: f32) -> Option<Self> { ... } fn from_f64(n: f64) -> Option<Self> { ... } }
A generic trait for converting a number to a value.
Required Methods
fn from_i64(n: i64) -> Option<Self>
Convert an i64
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
fn from_u64(n: u64) -> Option<Self>
Convert an u64
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
Provided Methods
fn from_isize(n: isize) -> Option<Self>
Convert an isize
to return an optional value of this type. If the
value cannot be represented by this value, then None
is returned.
fn from_i8(n: i8) -> Option<Self>
Convert an i8
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
fn from_i16(n: i16) -> Option<Self>
Convert an i16
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
fn from_i32(n: i32) -> Option<Self>
Convert an i32
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
fn from_i128(n: i128) -> Option<Self>
Convert an i128
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
This method is only available with feature i128
enabled on Rust >= 1.26.
The default implementation converts through from_i64()
. Types implementing
this trait should override this method if they can represent a greater range.
fn from_usize(n: usize) -> Option<Self>
Convert a usize
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
fn from_u8(n: u8) -> Option<Self>
Convert an u8
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
fn from_u16(n: u16) -> Option<Self>
Convert an u16
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
fn from_u32(n: u32) -> Option<Self>
Convert an u32
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
fn from_u128(n: u128) -> Option<Self>
Convert an u128
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
This method is only available with feature i128
enabled on Rust >= 1.26.
The default implementation converts through from_u64()
. Types implementing
this trait should override this method if they can represent a greater range.
fn from_f32(n: f32) -> Option<Self>
Convert a f32
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
fn from_f64(n: f64) -> Option<Self>
Convert a f64
to return an optional value of this type. If the
type cannot be represented by this value, then None
is returned.
Implementations on Foreign Types
impl<T: FromPrimitive> FromPrimitive for Wrapping<T>
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impl<T: FromPrimitive> FromPrimitive for Wrapping<T>
fn from_isize(n: isize) -> Option<Self>
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fn from_isize(n: isize) -> Option<Self>
fn from_i8(n: i8) -> Option<Self>
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fn from_i8(n: i8) -> Option<Self>
fn from_i16(n: i16) -> Option<Self>
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fn from_i16(n: i16) -> Option<Self>
fn from_i32(n: i32) -> Option<Self>
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fn from_i32(n: i32) -> Option<Self>
fn from_i64(n: i64) -> Option<Self>
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fn from_i64(n: i64) -> Option<Self>
fn from_i128(n: i128) -> Option<Self>
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fn from_i128(n: i128) -> Option<Self>
fn from_usize(n: usize) -> Option<Self>
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fn from_usize(n: usize) -> Option<Self>
fn from_u8(n: u8) -> Option<Self>
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fn from_u8(n: u8) -> Option<Self>
fn from_u16(n: u16) -> Option<Self>
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fn from_u16(n: u16) -> Option<Self>
fn from_u32(n: u32) -> Option<Self>
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fn from_u32(n: u32) -> Option<Self>
fn from_u64(n: u64) -> Option<Self>
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fn from_u64(n: u64) -> Option<Self>
fn from_u128(n: u128) -> Option<Self>
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fn from_u128(n: u128) -> Option<Self>
fn from_f32(n: f32) -> Option<Self>
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fn from_f32(n: f32) -> Option<Self>
fn from_f64(n: f64) -> Option<Self>
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fn from_f64(n: f64) -> Option<Self>
Implementors
impl FromPrimitive for isize
impl FromPrimitive for i8
impl FromPrimitive for i16
impl FromPrimitive for i32
impl FromPrimitive for i64
impl FromPrimitive for i128
impl FromPrimitive for usize
impl FromPrimitive for u8
impl FromPrimitive for u16
impl FromPrimitive for u32
impl FromPrimitive for u64
impl FromPrimitive for u128
impl FromPrimitive for f32
impl FromPrimitive for f64