Trait num_traits::cast::FromPrimitive

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.

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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.

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Implementations on Foreign Types

impl<T: FromPrimitive> FromPrimitive for Wrapping<T>

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_i64(n: i64) -> 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_u64(n: u64) -> Option<Self>

fn from_u128(n: u128) -> Option<Self>

fn from_f32(n: f32) -> Option<Self>

fn from_f64(n: f64) -> Option<Self>

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Implementors

impl FromPrimitive for f32

fn from_isize(n: isize) -> Option<f32>

fn from_i8(n: i8) -> Option<f32>

fn from_i16(n: i16) -> Option<f32>

fn from_i32(n: i32) -> Option<f32>

fn from_i64(n: i64) -> Option<f32>

fn from_i128(n: i128) -> Option<f32>

fn from_usize(n: usize) -> Option<f32>

fn from_u8(n: u8) -> Option<f32>

fn from_u16(n: u16) -> Option<f32>

fn from_u32(n: u32) -> Option<f32>

fn from_u64(n: u64) -> Option<f32>

fn from_u128(n: u128) -> Option<f32>

fn from_f32(n: f32) -> Option<f32>

fn from_f64(n: f64) -> Option<f32>

impl FromPrimitive for f64

fn from_isize(n: isize) -> Option<f64>

fn from_i8(n: i8) -> Option<f64>

fn from_i16(n: i16) -> Option<f64>

fn from_i32(n: i32) -> Option<f64>

fn from_i64(n: i64) -> Option<f64>

fn from_i128(n: i128) -> Option<f64>

fn from_usize(n: usize) -> Option<f64>

fn from_u8(n: u8) -> Option<f64>

fn from_u16(n: u16) -> Option<f64>

fn from_u32(n: u32) -> Option<f64>

fn from_u64(n: u64) -> Option<f64>

fn from_u128(n: u128) -> Option<f64>

fn from_f32(n: f32) -> Option<f64>

fn from_f64(n: f64) -> Option<f64>

impl FromPrimitive for i8

fn from_isize(n: isize) -> Option<i8>

fn from_i8(n: i8) -> Option<i8>

fn from_i16(n: i16) -> Option<i8>

fn from_i32(n: i32) -> Option<i8>

fn from_i64(n: i64) -> Option<i8>

fn from_i128(n: i128) -> Option<i8>

fn from_usize(n: usize) -> Option<i8>

fn from_u8(n: u8) -> Option<i8>

fn from_u16(n: u16) -> Option<i8>

fn from_u32(n: u32) -> Option<i8>

fn from_u64(n: u64) -> Option<i8>

fn from_u128(n: u128) -> Option<i8>

fn from_f32(n: f32) -> Option<i8>

fn from_f64(n: f64) -> Option<i8>

impl FromPrimitive for i16

fn from_isize(n: isize) -> Option<i16>

fn from_i8(n: i8) -> Option<i16>

fn from_i16(n: i16) -> Option<i16>

fn from_i32(n: i32) -> Option<i16>

fn from_i64(n: i64) -> Option<i16>

fn from_i128(n: i128) -> Option<i16>

fn from_usize(n: usize) -> Option<i16>

fn from_u8(n: u8) -> Option<i16>

fn from_u16(n: u16) -> Option<i16>

fn from_u32(n: u32) -> Option<i16>

fn from_u64(n: u64) -> Option<i16>

fn from_u128(n: u128) -> Option<i16>

fn from_f32(n: f32) -> Option<i16>

fn from_f64(n: f64) -> Option<i16>

impl FromPrimitive for i32

fn from_isize(n: isize) -> Option<i32>

fn from_i8(n: i8) -> Option<i32>

fn from_i16(n: i16) -> Option<i32>

fn from_i32(n: i32) -> Option<i32>

fn from_i64(n: i64) -> Option<i32>

fn from_i128(n: i128) -> Option<i32>

fn from_usize(n: usize) -> Option<i32>

fn from_u8(n: u8) -> Option<i32>

fn from_u16(n: u16) -> Option<i32>

fn from_u32(n: u32) -> Option<i32>

fn from_u64(n: u64) -> Option<i32>

fn from_u128(n: u128) -> Option<i32>

fn from_f32(n: f32) -> Option<i32>

fn from_f64(n: f64) -> Option<i32>

impl FromPrimitive for i64

fn from_isize(n: isize) -> Option<i64>

fn from_i8(n: i8) -> Option<i64>

fn from_i16(n: i16) -> Option<i64>

fn from_i32(n: i32) -> Option<i64>

fn from_i64(n: i64) -> Option<i64>

fn from_i128(n: i128) -> Option<i64>

fn from_usize(n: usize) -> Option<i64>

fn from_u8(n: u8) -> Option<i64>

fn from_u16(n: u16) -> Option<i64>

fn from_u32(n: u32) -> Option<i64>

fn from_u64(n: u64) -> Option<i64>

fn from_u128(n: u128) -> Option<i64>

fn from_f32(n: f32) -> Option<i64>

fn from_f64(n: f64) -> Option<i64>

impl FromPrimitive for i128

fn from_isize(n: isize) -> Option<i128>

fn from_i8(n: i8) -> Option<i128>

fn from_i16(n: i16) -> Option<i128>

fn from_i32(n: i32) -> Option<i128>

fn from_i64(n: i64) -> Option<i128>

fn from_i128(n: i128) -> Option<i128>

fn from_usize(n: usize) -> Option<i128>

fn from_u8(n: u8) -> Option<i128>

fn from_u16(n: u16) -> Option<i128>

fn from_u32(n: u32) -> Option<i128>

fn from_u64(n: u64) -> Option<i128>

fn from_u128(n: u128) -> Option<i128>

fn from_f32(n: f32) -> Option<i128>

fn from_f64(n: f64) -> Option<i128>

impl FromPrimitive for isize

fn from_isize(n: isize) -> Option<isize>

fn from_i8(n: i8) -> Option<isize>

fn from_i16(n: i16) -> Option<isize>

fn from_i32(n: i32) -> Option<isize>

fn from_i64(n: i64) -> Option<isize>

fn from_i128(n: i128) -> Option<isize>

fn from_usize(n: usize) -> Option<isize>

fn from_u8(n: u8) -> Option<isize>

fn from_u16(n: u16) -> Option<isize>

fn from_u32(n: u32) -> Option<isize>

fn from_u64(n: u64) -> Option<isize>

fn from_u128(n: u128) -> Option<isize>

fn from_f32(n: f32) -> Option<isize>

fn from_f64(n: f64) -> Option<isize>

impl FromPrimitive for u8

fn from_isize(n: isize) -> Option<u8>

fn from_i8(n: i8) -> Option<u8>

fn from_i16(n: i16) -> Option<u8>

fn from_i32(n: i32) -> Option<u8>

fn from_i64(n: i64) -> Option<u8>

fn from_i128(n: i128) -> Option<u8>

fn from_usize(n: usize) -> Option<u8>

fn from_u8(n: u8) -> Option<u8>

fn from_u16(n: u16) -> Option<u8>

fn from_u32(n: u32) -> Option<u8>

fn from_u64(n: u64) -> Option<u8>

fn from_u128(n: u128) -> Option<u8>

fn from_f32(n: f32) -> Option<u8>

fn from_f64(n: f64) -> Option<u8>

impl FromPrimitive for u16

fn from_isize(n: isize) -> Option<u16>

fn from_i8(n: i8) -> Option<u16>

fn from_i16(n: i16) -> Option<u16>

fn from_i32(n: i32) -> Option<u16>

fn from_i64(n: i64) -> Option<u16>

fn from_i128(n: i128) -> Option<u16>

fn from_usize(n: usize) -> Option<u16>

fn from_u8(n: u8) -> Option<u16>

fn from_u16(n: u16) -> Option<u16>

fn from_u32(n: u32) -> Option<u16>

fn from_u64(n: u64) -> Option<u16>

fn from_u128(n: u128) -> Option<u16>

fn from_f32(n: f32) -> Option<u16>

fn from_f64(n: f64) -> Option<u16>

impl FromPrimitive for u32

fn from_isize(n: isize) -> Option<u32>

fn from_i8(n: i8) -> Option<u32>

fn from_i16(n: i16) -> Option<u32>

fn from_i32(n: i32) -> Option<u32>

fn from_i64(n: i64) -> Option<u32>

fn from_i128(n: i128) -> Option<u32>

fn from_usize(n: usize) -> Option<u32>

fn from_u8(n: u8) -> Option<u32>

fn from_u16(n: u16) -> Option<u32>

fn from_u32(n: u32) -> Option<u32>

fn from_u64(n: u64) -> Option<u32>

fn from_u128(n: u128) -> Option<u32>

fn from_f32(n: f32) -> Option<u32>

fn from_f64(n: f64) -> Option<u32>

impl FromPrimitive for u64

fn from_isize(n: isize) -> Option<u64>

fn from_i8(n: i8) -> Option<u64>

fn from_i16(n: i16) -> Option<u64>

fn from_i32(n: i32) -> Option<u64>

fn from_i64(n: i64) -> Option<u64>

fn from_i128(n: i128) -> Option<u64>

fn from_usize(n: usize) -> Option<u64>

fn from_u8(n: u8) -> Option<u64>

fn from_u16(n: u16) -> Option<u64>

fn from_u32(n: u32) -> Option<u64>

fn from_u64(n: u64) -> Option<u64>

fn from_u128(n: u128) -> Option<u64>

fn from_f32(n: f32) -> Option<u64>

fn from_f64(n: f64) -> Option<u64>

impl FromPrimitive for u128

fn from_isize(n: isize) -> Option<u128>

fn from_i8(n: i8) -> Option<u128>

fn from_i16(n: i16) -> Option<u128>

fn from_i32(n: i32) -> Option<u128>

fn from_i64(n: i64) -> Option<u128>

fn from_i128(n: i128) -> Option<u128>

fn from_usize(n: usize) -> Option<u128>

fn from_u8(n: u8) -> Option<u128>

fn from_u16(n: u16) -> Option<u128>

fn from_u32(n: u32) -> Option<u128>

fn from_u64(n: u64) -> Option<u128>

fn from_u128(n: u128) -> Option<u128>

fn from_f32(n: f32) -> Option<u128>

fn from_f64(n: f64) -> Option<u128>

impl FromPrimitive for usize

fn from_isize(n: isize) -> Option<usize>

fn from_i8(n: i8) -> Option<usize>

fn from_i16(n: i16) -> Option<usize>

fn from_i32(n: i32) -> Option<usize>

fn from_i64(n: i64) -> Option<usize>

fn from_i128(n: i128) -> Option<usize>

fn from_usize(n: usize) -> Option<usize>

fn from_u8(n: u8) -> Option<usize>

fn from_u16(n: u16) -> Option<usize>

fn from_u32(n: u32) -> Option<usize>

fn from_u64(n: u64) -> Option<usize>

fn from_u128(n: u128) -> Option<usize>

fn from_f32(n: f32) -> Option<usize>

fn from_f64(n: f64) -> Option<usize>

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