Trait tor_hsservice::internal_prelude::fmt::UpperExp
1.0.0 · source · pub trait UpperExp {
// Required method
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>;
}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<'a, I> UpperExp for Format<'a, I>
impl<'s, T> UpperExp for SliceVec<'s, T>where
T: UpperExp,
impl<A> UpperExp for ArrayVec<A>where
A: Array,
<A as Array>::Item: UpperExp,
impl<A> UpperExp for TinyVec<A>where
A: Array,
<A as Array>::Item: UpperExp,
impl<T> UpperExp for &T
impl<T> UpperExp for &mut T
impl<T> UpperExp for BoxSensitive<T>where
T: UpperExp,
impl<T> UpperExp for Sensitive<T>where
T: UpperExp,
impl<T> UpperExp for FmtBinary<T>
Available on non-
tarpaulin_include only.impl<T> UpperExp for FmtDisplay<T>
Available on non-
tarpaulin_include only.impl<T> UpperExp for FmtList<T>
impl<T> UpperExp for FmtLowerExp<T>
Available on non-
tarpaulin_include only.impl<T> UpperExp for FmtLowerHex<T>
Available on non-
tarpaulin_include only.impl<T> UpperExp for FmtOctal<T>
Available on non-
tarpaulin_include only.impl<T> UpperExp for FmtPointer<T>
Available on non-
tarpaulin_include only.impl<T> UpperExp for FmtUpperExp<T>where
T: UpperExp,
Available on non-
tarpaulin_include only.impl<T> UpperExp for FmtUpperHex<T>
Available on non-
tarpaulin_include only.