🛈 Note: This is pre-release documentation for the upcoming tracing 0.2.0 ecosystem.

For the release documentation, please see docs.rs, instead.

Struct tracing::field::FieldSet

source ·
pub struct FieldSet { /* private fields */ }
Expand description

Describes the fields present on a span.

Equality

In well-behaved applications, two FieldSets initialized with equal callsite identifiers will have identical fields. Consequently, in release builds, FieldSet::eq only checks that its arguments have equal callsites. However, the equality of field names is checked in debug builds.

Implementations

Constructs a new FieldSet with the given array of field names and callsite.

Returns the Field named name, or None if no such field exists.

Returns true if self contains the given field.

Note: If field shares a name with a field
in this FieldSet, but was created by a FieldSet
with a different callsite, this FieldSet does not
contain it. This is so that if two separate span callsites define a field
named "foo", the Field corresponding to "foo" for each
of those callsites are not equivalent.

Returns an iterator over the Fields in this FieldSet.

Returns the number of fields in this FieldSet.

Returns whether or not this FieldSet has fields.

Trait Implementations

Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
Which kind of iterator are we turning this into?
The type of the elements being iterated over.
Creates an iterator from a value. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Converts the given value to a String. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.
Available on crate feature std only.
Attaches the provided collector to this type, returning a WithDispatch wrapper. Read more
Available on crate feature std only.
Attaches the current default collector to this type, returning a WithDispatch wrapper. Read more