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| <h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>log</a>::<wbr><a class="macro" href=''>trace</a></span><span class='out-of-band'><span id='render-detail'> |
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| <pre class="rust macro"> |
| <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">trace</span> { |
| (<span class="ident">target</span>: <span class="macro-nonterminal">$</span><span class="macro-nonterminal">target</span>:<span class="ident">expr</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=></span> { ... }; |
| ($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">arg</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=></span> { ... }; |
| }</pre> |
| <div class='docblock'><p>Logs a message at the trace level.</p> |
| |
| <p>Logging at this level is disabled if any of the following features are |
| present: <code>max_level_off</code>, <code>max_level_error</code>, <code>max_level_warn</code>, |
| <code>max_level_info</code>, or <code>max_level_debug</code>.</p> |
| |
| <p>When building in release mode (i.e., without the <code>debug_assertions</code> option), |
| logging at this level is also disabled if any of the following features are |
| present: <code>release_max_level_off</code>, <code>release_max_level_error</code>, |
| <code>release_max_level_warn</code>, <code>release_max_level_info</code>, or |
| <code>release_max_level_debug</code>.</p> |
| |
| <h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1> |
| <pre class="rust rust-example-rendered"> |
| <span class="kw">let</span> <span class="ident">pos</span> <span class="op">=</span> <span class="ident">Position</span> { <span class="ident">x</span>: <span class="number">3.234</span>, <span class="ident">y</span>: <span class="op">-</span><span class="number">1.223</span> }; |
| |
| <span class="macro">trace</span><span class="macro">!</span>(<span class="string">"Position is: x: {}, y: {}"</span>, <span class="ident">pos</span>.<span class="ident">x</span>, <span class="ident">pos</span>.<span class="ident">y</span>); |
| <span class="macro">trace</span><span class="macro">!</span>(<span class="ident">target</span>: <span class="string">"app_events"</span>, <span class="string">"x is {} and y is {}"</span>, |
| <span class="kw">if</span> <span class="ident">pos</span>.<span class="ident">x</span> <span class="op">>=</span> <span class="number">0.0</span> { <span class="string">"positive"</span> } <span class="kw">else</span> { <span class="string">"negative"</span> }, |
| <span class="kw">if</span> <span class="ident">pos</span>.<span class="ident">y</span> <span class="op">>=</span> <span class="number">0.0</span> { <span class="string">"positive"</span> } <span class="kw">else</span> { <span class="string">"negative"</span> });</pre> |
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