core::fmt::UpperExp - Rust
Description: API documentation for the Rust `UpperExp` trait in crate `core`.
Keywords: rust, rustlang, rust-lang, UpperExp

# 1.0.0[−][src]Trait core::fmt::UpperExp

    pub trait UpperExp {
        fn fmt(&self, f: &mut Formatter) -> Result;
    }

`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 = self.0;
            write!(f, "{}E1", val / 10)
        }
    }

    let l = Length(100);

    println!("l in scientific notation is: {:E}", l);Run

## Required methods

### `fn fmt(&self, f: &mut Formatter) -> Result`

Formats the value using the given formatter.

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## Implementors

### `impl UpperExp for f32`[src]

#### `fn fmt(&self, fmt: &mut Formatter) -> Result`[src]

### `impl UpperExp for f64`[src]

#### `fn fmt(&self, fmt: &mut Formatter) -> Result`[src]

### `impl<'_, T: ?Sized + UpperExp> UpperExp for &'_ T`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

### `impl<'_, T: ?Sized + UpperExp> UpperExp for &'_ mut T`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

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