[−][src]Trait num_traits::cast::FromPrimitive
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.
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.
fn from_f32(n: f32) -> Option<Self>
Converts a f32
to return an optional value of this type. If the
value cannot be represented by this type, then None
is returned.
fn from_f64(n: f64) -> Option<Self>
Converts a f64
to return an optional value of this type. If the
value cannot be represented by this type, then None
is returned.