Trait alloc::fmt::UpperExp 1.0.0[−][src]
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!("{:E}", x), "4.2E1");Run
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: {:E}", l), "l in scientific notation is: 1E2" ); assert_eq!( format!("l in scientific notation is: {:05E}", l), "l in scientific notation is: 001E2" );Run
Required methods
pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>[src]
Formats the value using the given formatter.
Implementors
impl UpperExp for f32[src]
impl UpperExp for f64[src]
impl UpperExp for i81.42.0[src]
impl UpperExp for i161.42.0[src]
impl UpperExp for i321.42.0[src]
impl UpperExp for i641.42.0[src]
impl UpperExp for i1281.42.0[src]
impl UpperExp for isize1.42.0[src]
impl UpperExp for u81.42.0[src]
impl UpperExp for u161.42.0[src]
impl UpperExp for u321.42.0[src]
impl UpperExp for u641.42.0[src]
impl UpperExp for u1281.42.0[src]
impl UpperExp for usize1.42.0[src]
impl<'_, T> UpperExp for &'_ T where
T: UpperExp + ?Sized, [src]
T: UpperExp + ?Sized,
impl<'_, T> UpperExp for &'_ mut T where
T: UpperExp + ?Sized, [src]
T: UpperExp + ?Sized,