Trait num_traits::cast::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_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, 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_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, the 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, 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_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, the 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.