RONCC
/
HPC-Tools-for-Quantum-Computing


			
				
					
						
						
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="generator" content="rustdoc">
    <meta name="description" content="API documentation for the Rust `current` fn in crate `futures`.">
    <meta name="keywords" content="rust, rustlang, rust-lang, current">

    <title>futures::task::current - Rust</title>

    <link rel="stylesheet" type="text/css" href="../../normalize.css">
    <link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle">
    
    <link rel="stylesheet" type="text/css" href="../../dark.css">
    <link rel="stylesheet" type="text/css" href="../../main.css" id="themeStyle">
    <script src="../../storage.js"></script>
    

    
    
</head>
<body class="rustdoc fn">
    <!--[if lte IE 8]>
    <div class="warning">
        This old browser is unsupported and will most likely display funky
        things.
    </div>
    <![endif]-->

    

    <nav class="sidebar">
        <div class="sidebar-menu">&#9776;</div>
        
        <p class='location'><a href='../index.html'>futures</a>::<wbr><a href='index.html'>task</a></p><script>window.sidebarCurrent = {name: 'current', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script>
    </nav>

    <div class="theme-picker">
        <button id="theme-picker" aria-label="Pick another theme!">
            <img src="../../brush.svg" width="18" alt="Pick another theme!">
        </button>
        <div id="theme-choices"></div>
    </div>
    <script src="../../theme.js"></script>
    <nav class="sub">
        <form class="search-form js-only">
            <div class="search-container">
                <input class="search-input" name="search"
                       autocomplete="off"
                       placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
                       type="search">
            </div>
        </form>
    </nav>

    <section id='main' class="content">
<h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>futures</a>::<wbr><a href='index.html'>task</a>::<wbr><a class="fn" href=''>current</a></span><span class='out-of-band'><span id='render-detail'>
                   <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
                       [<span class='inner'>&#x2212;</span>]
                   </a>
               </span><a class='srclink' href='../../src/futures/task_impl/mod.rs.html#89-100' title='goto source code'>[src]</a></span></h1>
<pre class='rust fn'>pub fn current() -&gt; <a class="struct" href="../../futures/task/struct.Task.html" title="struct futures::task::Task">Task</a></pre><div class='docblock'><p>Returns a handle to the current task to call <code>notify</code> at a later date.</p>
<p>The returned handle implements the <code>Send</code> and <code>'static</code> bounds and may also
be cheaply cloned. This is useful for squirreling away the handle into a
location which is then later signaled that a future can make progress.</p>
<p>Implementations of the <code>Future</code> trait typically use this function if they
would otherwise perform a blocking operation. When something isn't ready
yet, this <code>current</code> function is called to acquire a handle to the current
task, and then the future arranges it such that when the blocking operation
otherwise finishes (perhaps in the background) it will <code>notify</code> the
returned handle.</p>
<p>It's sometimes necessary to pass extra information to the task when
unparking it, so that the task knows something about <em>why</em> it was woken.
See the <code>FutureQueue</code> documentation for details on how to do this.</p>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p>This function will panic if a task is not currently being executed. That
is, this method can be dangerous to call outside of an implementation of
<code>poll</code>.</p>
</div></section>
    <section id='search' class="content hidden"></section>

    <section class="footer"></section>

    <aside id="help" class="hidden">
        <div>
            <h1 class="hidden">Help</h1>

            <div class="shortcuts">
                <h2>Keyboard Shortcuts</h2>

                <dl>
                    <dt><kbd>?</kbd></dt>
                    <dd>Show this help dialog</dd>
                    <dt><kbd>S</kbd></dt>
                    <dd>Focus the search field</dd>
                    <dt><kbd>↑</kbd></dt>
                    <dd>Move up in search results</dd>
                    <dt><kbd>↓</kbd></dt>
                    <dd>Move down in search results</dd>
                    <dt><kbd>↹</kbd></dt>
                    <dd>Switch tab</dd>
                    <dt><kbd>&#9166;</kbd></dt>
                    <dd>Go to active search result</dd>
                    <dt><kbd>+</kbd></dt>
                    <dd>Expand all sections</dd>
                    <dt><kbd>-</kbd></dt>
                    <dd>Collapse all sections</dd>
                </dl>
            </div>

            <div class="infos">
                <h2>Search Tricks</h2>

                <p>
                    Prefix searches with a type followed by a colon (e.g.
                    <code>fn:</code>) to restrict the search to a given type.
                </p>

                <p>
                    Accepted types are: <code>fn</code>, <code>mod</code>,
                    <code>struct</code>, <code>enum</code>,
                    <code>trait</code>, <code>type</code>, <code>macro</code>,
                    and <code>const</code>.
                </p>

                <p>
                    Search functions by type signature (e.g.
                    <code>vec -> usize</code> or <code>* -> vec</code>)
                </p>
            </div>
        </div>
    </aside>

    

    <script>
        window.rootPath = "../../";
        window.currentCrate = "futures";
    </script>
    <script src="../../main.js"></script>
    <script defer src="../../search-index.js"></script>
</body>
</html>