# Trait enum_primitive::FromPrimitive [−] [src]

    pub trait FromPrimitive {
        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_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_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, the `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, the `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, the `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, the `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, the `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, the `None` is returned.

### `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, the `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, the `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, the `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, the `None` is returned.

### `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, the `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, the `None` is returned.

## Implementations on Foreign Types

### `impl FromPrimitive for f64`
[src]

#### `fn from_i8(n: i8) -> Option<f64>`
[src]

#### `fn from_i16(n: i16) -> Option<f64>`
[src]

#### `fn from_i32(n: i32) -> Option<f64>`
[src]

#### `fn from_i64(n: i64) -> Option<f64>`
[src]

#### `fn from_u8(n: u8) -> Option<f64>`
[src]

#### `fn from_u16(n: u16) -> Option<f64>`
[src]

#### `fn from_u32(n: u32) -> Option<f64>`
[src]

#### `fn from_u64(n: u64) -> Option<f64>`
[src]

#### `fn from_f32(n: f32) -> Option<f64>`
[src]

#### `fn from_f64(n: f64) -> Option<f64>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for i16`
[src]

#### `fn from_i8(n: i8) -> Option<i16>`
[src]

#### `fn from_i16(n: i16) -> Option<i16>`
[src]

#### `fn from_i32(n: i32) -> Option<i16>`
[src]

#### `fn from_i64(n: i64) -> Option<i16>`
[src]

#### `fn from_u8(n: u8) -> Option<i16>`
[src]

#### `fn from_u16(n: u16) -> Option<i16>`
[src]

#### `fn from_u32(n: u32) -> Option<i16>`
[src]

#### `fn from_u64(n: u64) -> Option<i16>`
[src]

#### `fn from_f32(n: f32) -> Option<i16>`
[src]

#### `fn from_f64(n: f64) -> Option<i16>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for isize`
[src]

#### `fn from_i8(n: i8) -> Option<isize>`
[src]

#### `fn from_i16(n: i16) -> Option<isize>`
[src]

#### `fn from_i32(n: i32) -> Option<isize>`
[src]

#### `fn from_i64(n: i64) -> Option<isize>`
[src]

#### `fn from_u8(n: u8) -> Option<isize>`
[src]

#### `fn from_u16(n: u16) -> Option<isize>`
[src]

#### `fn from_u32(n: u32) -> Option<isize>`
[src]

#### `fn from_u64(n: u64) -> Option<isize>`
[src]

#### `fn from_f32(n: f32) -> Option<isize>`
[src]

#### `fn from_f64(n: f64) -> Option<isize>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for i8`
[src]

#### `fn from_i8(n: i8) -> Option<i8>`
[src]

#### `fn from_i16(n: i16) -> Option<i8>`
[src]

#### `fn from_i32(n: i32) -> Option<i8>`
[src]

#### `fn from_i64(n: i64) -> Option<i8>`
[src]

#### `fn from_u8(n: u8) -> Option<i8>`
[src]

#### `fn from_u16(n: u16) -> Option<i8>`
[src]

#### `fn from_u32(n: u32) -> Option<i8>`
[src]

#### `fn from_u64(n: u64) -> Option<i8>`
[src]

#### `fn from_f32(n: f32) -> Option<i8>`
[src]

#### `fn from_f64(n: f64) -> Option<i8>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for u8`
[src]

#### `fn from_i8(n: i8) -> Option<u8>`
[src]

#### `fn from_i16(n: i16) -> Option<u8>`
[src]

#### `fn from_i32(n: i32) -> Option<u8>`
[src]

#### `fn from_i64(n: i64) -> Option<u8>`
[src]

#### `fn from_u8(n: u8) -> Option<u8>`
[src]

#### `fn from_u16(n: u16) -> Option<u8>`
[src]

#### `fn from_u32(n: u32) -> Option<u8>`
[src]

#### `fn from_u64(n: u64) -> Option<u8>`
[src]

#### `fn from_f32(n: f32) -> Option<u8>`
[src]

#### `fn from_f64(n: f64) -> Option<u8>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for usize`
[src]

#### `fn from_i8(n: i8) -> Option<usize>`
[src]

#### `fn from_i16(n: i16) -> Option<usize>`
[src]

#### `fn from_i32(n: i32) -> Option<usize>`
[src]

#### `fn from_i64(n: i64) -> Option<usize>`
[src]

#### `fn from_u8(n: u8) -> Option<usize>`
[src]

#### `fn from_u16(n: u16) -> Option<usize>`
[src]

#### `fn from_u32(n: u32) -> Option<usize>`
[src]

#### `fn from_u64(n: u64) -> Option<usize>`
[src]

#### `fn from_f32(n: f32) -> Option<usize>`
[src]

#### `fn from_f64(n: f64) -> Option<usize>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for i64`
[src]

#### `fn from_i8(n: i8) -> Option<i64>`
[src]

#### `fn from_i16(n: i16) -> Option<i64>`
[src]

#### `fn from_i32(n: i32) -> Option<i64>`
[src]

#### `fn from_i64(n: i64) -> Option<i64>`
[src]

#### `fn from_u8(n: u8) -> Option<i64>`
[src]

#### `fn from_u16(n: u16) -> Option<i64>`
[src]

#### `fn from_u32(n: u32) -> Option<i64>`
[src]

#### `fn from_u64(n: u64) -> Option<i64>`
[src]

#### `fn from_f32(n: f32) -> Option<i64>`
[src]

#### `fn from_f64(n: f64) -> Option<i64>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for f32`
[src]

#### `fn from_i8(n: i8) -> Option<f32>`
[src]

#### `fn from_i16(n: i16) -> Option<f32>`
[src]

#### `fn from_i32(n: i32) -> Option<f32>`
[src]

#### `fn from_i64(n: i64) -> Option<f32>`
[src]

#### `fn from_u8(n: u8) -> Option<f32>`
[src]

#### `fn from_u16(n: u16) -> Option<f32>`
[src]

#### `fn from_u32(n: u32) -> Option<f32>`
[src]

#### `fn from_u64(n: u64) -> Option<f32>`
[src]

#### `fn from_f32(n: f32) -> Option<f32>`
[src]

#### `fn from_f64(n: f64) -> Option<f32>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for u64`
[src]

#### `fn from_i8(n: i8) -> Option<u64>`
[src]

#### `fn from_i16(n: i16) -> Option<u64>`
[src]

#### `fn from_i32(n: i32) -> Option<u64>`
[src]

#### `fn from_i64(n: i64) -> Option<u64>`
[src]

#### `fn from_u8(n: u8) -> Option<u64>`
[src]

#### `fn from_u16(n: u16) -> Option<u64>`
[src]

#### `fn from_u32(n: u32) -> Option<u64>`
[src]

#### `fn from_u64(n: u64) -> Option<u64>`
[src]

#### `fn from_f32(n: f32) -> Option<u64>`
[src]

#### `fn from_f64(n: f64) -> Option<u64>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for i32`
[src]

#### `fn from_i8(n: i8) -> Option<i32>`
[src]

#### `fn from_i16(n: i16) -> Option<i32>`
[src]

#### `fn from_i32(n: i32) -> Option<i32>`
[src]

#### `fn from_i64(n: i64) -> Option<i32>`
[src]

#### `fn from_u8(n: u8) -> Option<i32>`
[src]

#### `fn from_u16(n: u16) -> Option<i32>`
[src]

#### `fn from_u32(n: u32) -> Option<i32>`
[src]

#### `fn from_u64(n: u64) -> Option<i32>`
[src]

#### `fn from_f32(n: f32) -> Option<i32>`
[src]

#### `fn from_f64(n: f64) -> Option<i32>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for u32`
[src]

#### `fn from_i8(n: i8) -> Option<u32>`
[src]

#### `fn from_i16(n: i16) -> Option<u32>`
[src]

#### `fn from_i32(n: i32) -> Option<u32>`
[src]

#### `fn from_i64(n: i64) -> Option<u32>`
[src]

#### `fn from_u8(n: u8) -> Option<u32>`
[src]

#### `fn from_u16(n: u16) -> Option<u32>`
[src]

#### `fn from_u32(n: u32) -> Option<u32>`
[src]

#### `fn from_u64(n: u64) -> Option<u32>`
[src]

#### `fn from_f32(n: f32) -> Option<u32>`
[src]

#### `fn from_f64(n: f64) -> Option<u32>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl FromPrimitive for u16`
[src]

#### `fn from_i8(n: i8) -> Option<u16>`
[src]

#### `fn from_i16(n: i16) -> Option<u16>`
[src]

#### `fn from_i32(n: i32) -> Option<u16>`
[src]

#### `fn from_i64(n: i64) -> Option<u16>`
[src]

#### `fn from_u8(n: u8) -> Option<u16>`
[src]

#### `fn from_u16(n: u16) -> Option<u16>`
[src]

#### `fn from_u32(n: u32) -> Option<u16>`
[src]

#### `fn from_u64(n: u64) -> Option<u16>`
[src]

#### `fn from_f32(n: f32) -> Option<u16>`
[src]

#### `fn from_f64(n: f64) -> Option<u16>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

### `impl<T> FromPrimitive for Wrapping<T> where
T: FromPrimitive,`
[src]

#### `fn from_u64(n: u64) -> Option<Wrapping<T>>`
[src]

#### `fn from_i64(n: i64) -> Option<Wrapping<T>>`
[src]

#### `fn from_isize(n: isize) -> Option<Self>`
[src]

#### `fn from_i8(n: i8) -> Option<Self>`
[src]

#### `fn from_i16(n: i16) -> Option<Self>`
[src]

#### `fn from_i32(n: i32) -> Option<Self>`
[src]

#### `fn from_usize(n: usize) -> Option<Self>`
[src]

#### `fn from_u8(n: u8) -> Option<Self>`
[src]

#### `fn from_u16(n: u16) -> Option<Self>`
[src]

#### `fn from_u32(n: u32) -> Option<Self>`
[src]

#### `fn from_f32(n: f32) -> Option<Self>`
[src]

#### `fn from_f64(n: f64) -> Option<Self>`
[src]

## Implementors

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