Trait EnteredTraceSpan 

pub trait EnteredTraceSpan {
    // Required method
    fn or_if_tracing_disabled(self, f: impl FnOnce()) -> Self;
}

A marker trait returned by crate::interpret::Machine::enter_trace_span, identifying either a real tracing::span::EnteredSpan in case tracing is enabled, or the dummy type () when tracing is disabled. Also see crate::enter_trace_span! below.

Required Methods

fn or_if_tracing_disabled(self, f: impl FnOnce()) -> Self

Allows executing an alternative function when tracing is disabled. Useful for example if you want to open a trace span when tracing is enabled, and alternatively just log a line when tracing is disabled.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl EnteredTraceSpan for ()

fn or_if_tracing_disabled(self, f: impl FnOnce()) -> Self

impl EnteredTraceSpan for EnteredSpan

fn or_if_tracing_disabled(self, _f: impl FnOnce()) -> Self

Implementors