Trait FromFieldValue 

pub trait FromFieldValue:
    Clone
    + Default
    + Send
    + Sync
    + Serialize
    + DeserializeOwned
    + 'static {
    // Provided methods
    fn from_str_value(s: &str) -> Option<Self> { ... }
    fn from_u64_value(v: u64) -> Option<Self> { ... }
    fn from_i64_value(v: i64) -> Option<Self> { ... }
    fn from_bool_value(v: bool) -> Option<Self> { ... }
}

Trait for types that can be constructed from tracing field values.

Implement this for your context types to enable automatic field-to-context mapping.

Example

use dcontext_tracing::FromFieldValue;

#[derive(Clone, Default, Debug, serde::Serialize, serde::Deserialize)]
struct RequestId(String);

impl FromFieldValue for RequestId {
    fn from_str_value(s: &str) -> Option<Self> {
        Some(RequestId(s.to_string()))
    }
}

Provided Methods

fn from_str_value(s: &str) -> Option<Self>

Construct from a string value. Returns None if conversion fails.

fn from_u64_value(v: u64) -> Option<Self>

Construct from a u64 value. Returns None if conversion fails.

fn from_i64_value(v: i64) -> Option<Self>

Construct from an i64 value. Returns None if conversion fails.

fn from_bool_value(v: bool) -> Option<Self>

Construct from a bool value. Returns None if conversion fails.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors