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| </pre><pre class="rust"><code><span class="doccomment">//! Collects and records trace data. |
| </span><span class="kw">pub use </span>tracing_core::subscriber::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">pub use </span>tracing_core::dispatcher::DefaultGuard; |
| |
| <span class="doccomment">/// Sets this [`Subscriber`] as the default for the current thread for the |
| /// duration of a closure. |
| /// |
| /// The default subscriber is used when creating a new [`Span`] or |
| /// [`Event`]. |
| /// |
| /// |
| /// [`Span`]: super::span::Span |
| /// [`Subscriber`]: super::subscriber::Subscriber |
| /// [`Event`]: super::event::Event |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| </span><span class="kw">pub fn </span>with_default<T, S>(subscriber: S, f: <span class="kw">impl </span>FnOnce() -> T) -> T |
| <span class="kw">where |
| </span>S: Subscriber + Send + Sync + <span class="lifetime">'static</span>, |
| { |
| <span class="kw">crate</span>::dispatcher::with_default(<span class="kw-2">&</span><span class="kw">crate</span>::Dispatch::new(subscriber), f) |
| } |
| |
| <span class="doccomment">/// Sets this subscriber as the global default for the duration of the entire program. |
| /// Will be used as a fallback if no thread-local subscriber has been set in a thread (using `with_default`.) |
| /// |
| /// Can only be set once; subsequent attempts to set the global default will fail. |
| /// Returns whether the initialization was successful. |
| /// |
| /// Note: Libraries should *NOT* call `set_global_default()`! That will cause conflicts when |
| /// executables try to set them later. |
| /// |
| /// [span]: super::span |
| /// [`Subscriber`]: super::subscriber::Subscriber |
| /// [`Event`]: super::event::Event |
| </span><span class="kw">pub fn </span>set_global_default<S>(subscriber: S) -> <span class="prelude-ty">Result</span><(), SetGlobalDefaultError> |
| <span class="kw">where |
| </span>S: Subscriber + Send + Sync + <span class="lifetime">'static</span>, |
| { |
| <span class="kw">crate</span>::dispatcher::set_global_default(<span class="kw">crate</span>::Dispatch::new(subscriber)) |
| } |
| |
| <span class="doccomment">/// Sets the [`Subscriber`] as the default for the current thread for the |
| /// duration of the lifetime of the returned [`DefaultGuard`]. |
| /// |
| /// The default subscriber is used when creating a new [`Span`] or [`Event`]. |
| /// |
| /// [`Span`]: super::span::Span |
| /// [`Subscriber`]: super::subscriber::Subscriber |
| /// [`Event`]: super::event::Event |
| /// [`DefaultGuard`]: super::dispatcher::DefaultGuard |
| </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"std"</span>)))] |
| #[must_use = <span class="string">"Dropping the guard unregisters the subscriber."</span>] |
| </span><span class="kw">pub fn </span>set_default<S>(subscriber: S) -> DefaultGuard |
| <span class="kw">where |
| </span>S: Subscriber + Send + Sync + <span class="lifetime">'static</span>, |
| { |
| <span class="kw">crate</span>::dispatcher::set_default(<span class="kw-2">&</span><span class="kw">crate</span>::Dispatch::new(subscriber)) |
| } |
| |
| <span class="kw">pub use </span>tracing_core::dispatcher::SetGlobalDefaultError; |
| </code></pre></div> |
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