pub trait ToPrimitive {
Show 14 methods
// Required methods
fn to_i64(&self) -> Option<i64>;
fn to_u64(&self) -> Option<u64>;
// Provided methods
fn to_isize(&self) -> Option<isize> { ... }
fn to_i8(&self) -> Option<i8> { ... }
fn to_i16(&self) -> Option<i16> { ... }
fn to_i32(&self) -> Option<i32> { ... }
fn to_i128(&self) -> Option<i128> { ... }
fn to_usize(&self) -> Option<usize> { ... }
fn to_u8(&self) -> Option<u8> { ... }
fn to_u16(&self) -> Option<u16> { ... }
fn to_u32(&self) -> Option<u32> { ... }
fn to_u128(&self) -> Option<u128> { ... }
fn to_f32(&self) -> Option<f32> { ... }
fn to_f64(&self) -> Option<f64> { ... }
}Expand description
A generic trait for converting a value to a number.
A value can be represented by the target type when it lies within
the range of scalars supported by the target type.
For example, a negative integer cannot be represented by an unsigned
integer type, and an i64 with a very high magnitude might not be
convertible to an i32.
On the other hand, conversions with possible precision loss or truncation
are admitted, like an f32 with a decimal part to an integer type, or
even a large f64 saturating to f32 infinity.
Required Methods§
Provided Methods§
Sourcefn to_isize(&self) -> Option<isize>
fn to_isize(&self) -> Option<isize>
Converts the value of self to an isize. If the value cannot be
represented by an isize, then None is returned.
Sourcefn to_i8(&self) -> Option<i8>
fn to_i8(&self) -> Option<i8>
Converts the value of self to an i8. If the value cannot be
represented by an i8, then None is returned.
Sourcefn to_i16(&self) -> Option<i16>
fn to_i16(&self) -> Option<i16>
Converts the value of self to an i16. If the value cannot be
represented by an i16, then None is returned.
Sourcefn to_i32(&self) -> Option<i32>
fn to_i32(&self) -> Option<i32>
Converts the value of self to an i32. If the value cannot be
represented by an i32, then None is returned.
Sourcefn to_i128(&self) -> Option<i128>
fn to_i128(&self) -> Option<i128>
Converts the value of self to an i128. If the value cannot be
represented by an i128 (i64 under the default implementation), then
None is returned.
The default implementation converts through to_i64(). Types implementing
this trait should override this method if they can represent a greater range.
Sourcefn to_usize(&self) -> Option<usize>
fn to_usize(&self) -> Option<usize>
Converts the value of self to a usize. If the value cannot be
represented by a usize, then None is returned.
Examples found in repository?
examples/example.rs (line 22)
11fn main() {
12 use enum_unitary::{FromPrimitive, ToPrimitive};
13
14 assert_eq!(enum_iterator::cardinality::<Myenum>(), 3);
15 assert_eq!(Into::<usize>::into (Myenum::A), 0);
16 assert_eq!(Into::<usize>::into (Myenum::B), 1);
17 assert_eq!(Into::<usize>::into (Myenum::C), 2);
18 assert_eq!(Some (Myenum::A), Myenum::from_usize (0));
19 assert_eq!(Some (Myenum::B), Myenum::from_usize (1));
20 assert_eq!(Some (Myenum::C), Myenum::from_usize (2));
21 assert_eq!(None, Myenum::from_usize (3));
22 assert_eq!(Some (0), Myenum::A.to_usize());
23 assert_eq!(Some (1), Myenum::B.to_usize());
24 assert_eq!(Some (2), Myenum::C.to_usize());
25 assert_eq!(enum_iterator::first::<Myenum>().unwrap(), Myenum::A);
26 assert_eq!(enum_iterator::last::<Myenum>().unwrap(), Myenum::C);
27 let mut i = enum_iterator::all::<Myenum>();
28 assert_eq!(i.next(), Some (Myenum::A));
29 assert_eq!(i.next(), Some (Myenum::B));
30 assert_eq!(i.next(), Some (Myenum::C));
31 assert_eq!(i.next(), None);
32 assert_eq!(enum_iterator::next (&Myenum::A), Some (Myenum::B));
33 assert_eq!(enum_iterator::previous (&Myenum::A), None);
34 assert_eq!(enum_iterator::next (&Myenum::B), Some (Myenum::C));
35 assert_eq!(enum_iterator::previous (&Myenum::B), Some (Myenum::A));
36 assert_eq!(enum_iterator::next (&Myenum::C), None);
37 assert_eq!(enum_iterator::previous (&Myenum::C), Some (Myenum::B));
38}Sourcefn to_u8(&self) -> Option<u8>
fn to_u8(&self) -> Option<u8>
Converts the value of self to a u8. If the value cannot be
represented by a u8, then None is returned.
Sourcefn to_u16(&self) -> Option<u16>
fn to_u16(&self) -> Option<u16>
Converts the value of self to a u16. If the value cannot be
represented by a u16, then None is returned.
Sourcefn to_u32(&self) -> Option<u32>
fn to_u32(&self) -> Option<u32>
Converts the value of self to a u32. If the value cannot be
represented by a u32, then None is returned.
Sourcefn to_u128(&self) -> Option<u128>
fn to_u128(&self) -> Option<u128>
Converts the value of self to a u128. If the value cannot be
represented by a u128 (u64 under the default implementation), then
None is returned.
The default implementation converts through to_u64(). Types implementing
this trait should override this method if they can represent a greater range.
Sourcefn to_f32(&self) -> Option<f32>
fn to_f32(&self) -> Option<f32>
Converts the value of self to an f32. Overflows may map to positive
or negative inifinity, otherwise None is returned if the value cannot
be represented by an f32.
Sourcefn to_f64(&self) -> Option<f64>
fn to_f64(&self) -> Option<f64>
Converts the value of self to an f64. Overflows may map to positive
or negative inifinity, otherwise None is returned if the value cannot
be represented by an f64.
The default implementation tries to convert through to_i64(), and
failing that through to_u64(). Types implementing this trait should
override this method if they can represent a greater range.