# tracing_core::field::Empty - Rust
API documentation for the Rust `Empty` struct in crate `tracing_core`.
Keywords: rust, rustlang, rust-lang, Empty

# Struct tracing_core::field::Empty [−] [src]

    pub struct Empty;

An empty field.

This can be used to indicate that the value of a field is not currently present but will be recorded later.

When a field's value is `Empty`. it will not be recorded.

## Trait Implementations

### `impl Debug for Empty` [src]

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

Formats the value using the given formatter. Read more

### `impl Eq for Empty` [src]

### `impl PartialEq<Empty> for Empty` [src]

#### `fn eq(&self, other: &Empty) -> bool` [src]

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `#[must_use]pub fn ne(&self, other: &Rhs) -> bool` 1.0.0 [src]

This method tests for `!=`.

### `impl StructuralEq for Empty` [src]

### `impl StructuralPartialEq for Empty` [src]

### `impl Value for Empty` [src]

#### `fn record(&self, _: &Field, _: &mut dyn Visit)` [src]

Visits this value with the given `Visitor`.

## Auto Trait Implementations

### `impl RefUnwindSafe for Empty` [src]

### `impl Send for Empty` [src]

### `impl Sync for Empty` [src]

### `impl Unpin for Empty` [src]

### `impl UnwindSafe for Empty` [src]

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId` [src]

Gets the `TypeId` of `self`. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow(&self) -> &T` [src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow_mut(&mut self) -> &mut T` [src]

Mutably borrows from an owned value. Read more

### `impl<T> From<T> for T` [src]

#### `pub fn from(t: T) -> T` [src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `pub fn into(self) -> U` [src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>` [src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>` [src]

Performs the conversion.