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<img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="kw">use </span>std::{io, sync::Mutex};
<span class="kw">use </span><span class="kw">crate</span>::fmt::{WritableTarget, WriteStyle};
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt::writer) <span class="kw">mod </span>glob {}
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt::writer) <span class="kw">struct </span>BufferWriter {
target: WritableTarget,
}
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt) <span class="kw">struct </span>Buffer(Vec&lt;u8&gt;);
<span class="kw">impl </span>BufferWriter {
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt::writer) <span class="kw">fn </span>stderr(_is_test: bool, _write_style: WriteStyle) -&gt; <span class="self">Self </span>{
BufferWriter {
target: WritableTarget::Stderr,
}
}
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt::writer) <span class="kw">fn </span>stdout(_is_test: bool, _write_style: WriteStyle) -&gt; <span class="self">Self </span>{
BufferWriter {
target: WritableTarget::Stdout,
}
}
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt::writer) <span class="kw">fn </span>pipe(
_write_style: WriteStyle,
pipe: Box&lt;Mutex&lt;<span class="kw">dyn </span>io::Write + Send + <span class="lifetime">&#39;static</span>&gt;&gt;,
) -&gt; <span class="self">Self </span>{
BufferWriter {
target: WritableTarget::Pipe(pipe),
}
}
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt::writer) <span class="kw">fn </span>buffer(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Buffer {
Buffer(Vec::new())
}
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt::writer) <span class="kw">fn </span>print(<span class="kw-2">&amp;</span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span>Buffer) -&gt; io::Result&lt;()&gt; {
<span class="comment">// This impl uses the `eprint` and `print` macros
// instead of using the streams directly.
// This is so their output can be captured by `cargo test`.
</span><span class="kw">match </span><span class="kw-2">&amp;</span><span class="self">self</span>.target {
<span class="comment">// Safety: If the target type is `Pipe`, `target_pipe` will always be non-empty.
</span>WritableTarget::Pipe(pipe) =&gt; pipe.lock().unwrap().write_all(<span class="kw-2">&amp;</span>buf.<span class="number">0</span>)<span class="question-mark">?</span>,
WritableTarget::Stdout =&gt; <span class="macro">print!</span>(<span class="string">&quot;{}&quot;</span>, String::from_utf8_lossy(<span class="kw-2">&amp;</span>buf.<span class="number">0</span>)),
WritableTarget::Stderr =&gt; <span class="macro">eprint!</span>(<span class="string">&quot;{}&quot;</span>, String::from_utf8_lossy(<span class="kw-2">&amp;</span>buf.<span class="number">0</span>)),
}
<span class="prelude-val">Ok</span>(())
}
}
<span class="kw">impl </span>Buffer {
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt) <span class="kw">fn </span>clear(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
<span class="self">self</span>.<span class="number">0</span>.clear();
}
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt) <span class="kw">fn </span>write(<span class="kw-2">&amp;mut </span><span class="self">self</span>, buf: <span class="kw-2">&amp;</span>[u8]) -&gt; io::Result&lt;usize&gt; {
<span class="self">self</span>.<span class="number">0</span>.extend(buf);
<span class="prelude-val">Ok</span>(buf.len())
}
<span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt) <span class="kw">fn </span>flush(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; io::Result&lt;()&gt; {
<span class="prelude-val">Ok</span>(())
}
<span class="attribute">#[cfg(test)]
</span><span class="kw">pub</span>(<span class="kw">in </span><span class="kw">crate</span>::fmt) <span class="kw">fn </span>bytes(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0
</span>}
}
</code></pre></div>
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