167 lines
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167 lines
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<meta name="description" content="API documentation for the Rust `Backtrace` struct in crate `failure`.">
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<meta name="keywords" content="rust, rustlang, rust-lang, Backtrace">
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<title>failure::Backtrace - Rust</title>
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<div class="sidebar-menu">☰</div>
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<p class='location'>Struct Backtrace</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Default">Default</a><a href="#impl-Debug">Debug</a><a href="#impl-Display">Display</a></div></div><p class='location'><a href='index.html'>failure</a></p><script>window.sidebarCurrent = {name: 'Backtrace', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<input class="search-input" name="search"
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autocomplete="off"
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placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
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type="search">
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</form>
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</nav>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>failure</a>::<wbr><a class="struct" href=''>Backtrace</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/failure/backtrace/mod.rs.html#102-104' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct Backtrace { /* fields omitted */ }</pre><div class='docblock'><p>A <code>Backtrace</code>.</p>
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<p>This is an opaque wrapper around the backtrace provided by
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libbacktrace. A variety of optimizations have been performed to avoid
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unnecessary or ill-advised work:</p>
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<ul>
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<li>If this crate is compiled in <code>no_std</code> compatible mode, <code>Backtrace</code>
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is an empty struct, and will be completely compiled away.</li>
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<li>If this crate is run without the <code>RUST_BACKTRACE</code> environmental
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variable enabled, the backtrace will not be generated at runtime.</li>
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<li>Even if a backtrace is generated, the most expensive part of
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generating a backtrace is symbol resolution. This backtrace does not
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perform symbol resolution until it is actually read (e.g. by
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printing it). If the Backtrace is never used for anything, symbols
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never get resolved.</li>
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</ul>
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<p>Even with these optimizations, including a backtrace in your failure
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may not be appropriate to your use case. You are not required to put a
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backtrace in a custom <code>Fail</code> type.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><code>impl <a class="struct" href="../failure/struct.Backtrace.html" title="struct failure::Backtrace">Backtrace</a></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/backtrace/mod.rs.html#106-121' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><code>pub fn <a href='#method.new' class='fnname'>new</a>() -> <a class="struct" href="../failure/struct.Backtrace.html" title="struct failure::Backtrace">Backtrace</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/backtrace/mod.rs.html#110-112' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Constructs a new backtrace. This will only create a real backtrace
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if the crate is compiled in std mode and the <code>RUST_BACKTRACE</code>
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environmental variable is activated.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<h3 id='impl-Default' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../failure/struct.Backtrace.html" title="struct failure::Backtrace">Backtrace</a></code><a href='#impl-Default' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/backtrace/mod.rs.html#123-127' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.default' class="method"><span id='default.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -> <a class="struct" href="../failure/struct.Backtrace.html" title="struct failure::Backtrace">Backtrace</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/backtrace/mod.rs.html#124-126' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns the "default value" for a type. <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default">Read more</a></p>
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</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../failure/struct.Backtrace.html" title="struct failure::Backtrace">Backtrace</a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/backtrace/mod.rs.html#129-135' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/backtrace/mod.rs.html#130-134' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Display' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="struct" href="../failure/struct.Backtrace.html" title="struct failure::Backtrace">Backtrace</a></code><a href='#impl-Display' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/backtrace/mod.rs.html#137-143' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.fmt-1' class="method"><span id='fmt.v-1' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/failure/backtrace/mod.rs.html#138-142' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
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