pub trait UpperExp {
// Required method
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> ⓘ;
}Available on crate feature
dep_bytemuck only.Expand description
E formatting.
The UpperExp trait should format its output in scientific notation with an upper-case E.
For more information on formatters, see the module-level documentation.
§Examples
Basic usage with f64:
let x = 42.0; // 42.0 is '4.2E1' in scientific notation
assert_eq!(format!("{x:E}"), "4.2E1");Implementing UpperExp on a type:
use std::fmt;
struct Length(i32);
impl fmt::UpperExp for Length {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let val = f64::from(self.0);
fmt::UpperExp::fmt(&val, f) // delegate to f64's implementation
}
}
let l = Length(100);
assert_eq!(
format!("l in scientific notation is: {l:E}"),
"l in scientific notation is: 1E2"
);
assert_eq!(
format!("l in scientific notation is: {l:05E}"),
"l in scientific notation is: 001E2"
);Required Methods§
1.0.0 · Sourcefn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> ⓘ
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> ⓘ
Formats the value using the given formatter.
§Errors
This function should return Err if, and only if, the provided Formatter returns Err.
String formatting is considered an infallible operation; this function only
returns a Result because writing to the underlying stream might fail and it must
provide a way to propagate the fact that an error has occurred back up the stack.
Implementors§
impl UpperExp for f32
impl UpperExp for f64
impl UpperExp for i8
impl UpperExp for i16
impl UpperExp for i32
impl UpperExp for i64
impl UpperExp for i128
impl UpperExp for isize
impl UpperExp for u8
impl UpperExp for u16
impl UpperExp for u32
impl UpperExp for u64
impl UpperExp for u128
impl UpperExp for usize
impl UpperExp for ExampleBitfield
Available on crate feature
_bit_u8 and doc only.impl UpperExp for ExampleBitfieldCustom
Available on crate feature
_bit_u8 and doc only.impl UpperExp for ExampleBitfieldExtra
Available on crate feature
_bit_u8 and doc only.impl UpperExp for ExampleEnumSet
Available on
doc only.