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

# Struct tracing_core::span::Attributes [−] [src]

    pub struct Attributes<'a> { /* fields omitted */ }

Attributes provided to a `Subscriber` describing a new span when it is created.

## Implementations

### `impl<'a> Attributes<'a>` [src]

#### `pub fn new(
metadata: &'static Metadata<'static>,
values: &'a ValueSet<'a>
) -> Self` [src]

Returns `Attributes` describing a new child span of the current span, with the provided metadata and values.

#### `pub fn new_root(
metadata: &'static Metadata<'static>,
values: &'a ValueSet<'a>
) -> Self` [src]

Returns `Attributes` describing a new span at the root of its own trace tree, with the provided metadata and values.

#### `pub fn child_of(
parent: Id,
metadata: &'static Metadata<'static>,
values: &'a ValueSet<'a>
) -> Self` [src]

Returns `Attributes` describing a new child span of the specified parent span, with the provided metadata and values.

#### `pub fn metadata(&self) -> &'static Metadata<'static>` [src]

Returns a reference to the new span's metadata.

#### `pub fn values(&self) -> &ValueSet<'a>` [src]

Returns a reference to a `ValueSet` containing any values the new span was created with.

#### `pub fn is_root(&self) -> bool` [src]

Returns true if the new span should be a root.

#### `pub fn is_contextual(&self) -> bool` [src]

Returns true if the new span's parent should be determined based on the current context.

If this is true and the current thread is currently inside a span, then that span should be the new span's parent. Otherwise, if the current thread is not inside a span, then the new span will be the root of its own trace tree.

#### `pub fn parent(&self) -> Option<&Id>` [src]

Returns the new span's explicitly-specified parent, if there is one.

Otherwise (if the new span is a root or is a child of the current span), returns false.

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

Records all the fields in this set of `Attributes` with the provided Visitor.

#### `pub fn contains(&self, field: &Field) -> bool` [src]

Returns `true` if this set of `Attributes` contains a value for the given `Field`.

#### `pub fn is_empty(&self) -> bool` [src]

Returns true if this set of `Attributes` contains no values.

## Trait Implementations

### `impl<'a> Debug for Attributes<'a>` [src]

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

Formats the value using the given formatter. Read more

## Auto Trait Implementations

### `impl<'a> !RefUnwindSafe for Attributes<'a>` [src]

### `impl<'a> !Send for Attributes<'a>` [src]

### `impl<'a> !Sync for Attributes<'a>` [src]

### `impl<'a> Unpin for Attributes<'a>` [src]

### `impl<'a> !UnwindSafe for Attributes<'a>` [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.