Enum FieldValue 

pub enum FieldValue {
    U64(u64),
    I64(i64),
    F64(f64),
    Bool(bool),
    Str(&'static str),
    SmallString(CompactString),
    SharedString(Arc<String>),
    String(String),
}

Each captured field value. Str keeps a &'static str (zero-copy for literal field arguments), SmallString keeps the stack-inline-up-to-24-byte CompactString (no heap for short dynamic strings), SharedString keeps an Arc<String> for callers that want sharing, and String is the unrestricted owned fallback.

Variants

U64(u64)

I64(i64)

F64(f64)

Bool(bool)

Str(&'static str)

SmallString(CompactString)

SharedString(Arc<String>)

String(String)

Implementations

impl FieldValue

pub fn to_display_string(&self) -> CompactString

Return a &str view of the value. Numeric / bool variants format into a fresh CompactString (cheap, usually inline). Callers that want a stable borrow should match on the variant directly.

pub fn contains(&self, needle: &str) -> bool

Substring-match the printed representation. Used by the server’s filter that matches against root-span field values.

Trait Implementations

impl Clone for FieldValue

fn clone(&self) -> FieldValue

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FieldValue

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.