pub trait FromPrimitive: Sized {
Show 14 methods
// Required methods
fn from_i64(n: i64) -> Option<Self>;
fn from_u64(n: u64) -> Option<Self>;
// Provided methods
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> { ... }
}Expand description
A generic trait for converting a number to a value.
Required Methods§
Provided Methods§
Sourcefn from_isize(n: isize) -> Option<Self>
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.
Sourcefn from_i8(n: i8) -> Option<Self>
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.
Sourcefn from_i16(n: i16) -> Option<Self>
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.
Sourcefn from_i32(n: i32) -> Option<Self>
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.
Sourcefn from_i128(n: i128) -> Option<Self>
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.
Sourcefn from_usize(n: usize) -> Option<Self>
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.
Sourcefn from_u8(n: u8) -> Option<Self>
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.
Sourcefn from_u16(n: u16) -> Option<Self>
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.
Sourcefn from_u32(n: u32) -> Option<Self>
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.
Sourcefn from_u128(n: u128) -> Option<Self>
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.
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.