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| <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> |
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| </pre><pre class="rust "> |
| <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">Write</span>}; |
| |
| <span class="kw">use</span> <span class="ident">futures</span>::{<span class="ident">Poll</span>, <span class="ident">Future</span>, <span class="ident">Async</span>}; |
| |
| <span class="doccomment">/// A future used to fully flush an I/O object.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Resolves to the underlying I/O object once the flush operation is complete.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// Created by the [`flush`] function.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// [`flush`]: fn.flush.html</span> |
| <span class="attribute">#[<span class="ident">must_use</span> <span class="op">=</span> <span class="string">"futures do nothing unless polled"</span>]</span> |
| <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Flush</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> { |
| <span class="ident">a</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>, |
| } |
| |
| <span class="doccomment">/// Creates a future which will entirely flush an I/O object and then yield the</span> |
| <span class="doccomment">/// object itself.</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// This function will consume the object provided if an error happens, and</span> |
| <span class="doccomment">/// otherwise it will repeatedly call `flush` until it sees `Ok(())`, scheduling</span> |
| <span class="doccomment">/// a retry if `WouldBlock` is seen along the way.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">flush</span><span class="op"><</span><span class="ident">A</span><span class="op">></span>(<span class="ident">a</span>: <span class="ident">A</span>) <span class="op">-></span> <span class="ident">Flush</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Write</span>, |
| { |
| <span class="ident">Flush</span> { |
| <span class="ident">a</span>: <span class="prelude-val">Some</span>(<span class="ident">a</span>), |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> <span class="ident">Future</span> <span class="kw">for</span> <span class="ident">Flush</span><span class="op"><</span><span class="ident">A</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">A</span>: <span class="ident">Write</span>, |
| { |
| <span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">A</span>; |
| <span class="kw">type</span> <span class="ident">Error</span> <span class="op">=</span> <span class="ident">io</span>::<span class="ident">Error</span>; |
| |
| <span class="kw">fn</span> <span class="ident">poll</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">Poll</span><span class="op"><</span><span class="ident">A</span>, <span class="ident">io</span>::<span class="ident">Error</span><span class="op">></span> { |
| <span class="macro">try_nb</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">as_mut</span>().<span class="ident">unwrap</span>().<span class="ident">flush</span>()); |
| <span class="prelude-val">Ok</span>(<span class="ident">Async</span>::<span class="ident">Ready</span>(<span class="self">self</span>.<span class="ident">a</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>())) |
| } |
| } |
| |
| </pre> |
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