[−][src]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>`

Converts an i64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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

Converts an u64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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Provided methods

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

Converts an isize to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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

Converts an i8 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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

Converts an i16 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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

Converts an i32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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

Converts an i128 to return an optional value of this type. If the value cannot be represented by this type, 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>`

Converts a usize to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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

Converts an u8 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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

Converts an u16 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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

Converts an u32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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

Converts an u128 to return an optional value of this type. If the value cannot be represented by this type, 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.