1017 lines
29 KiB
HTML
1017 lines
29 KiB
HTML
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<!doctype html>
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<html lang="en" class="no-js">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<meta name="description" content="A C++20 Kahn Process Network library">
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<link rel="next" href="getting-started/">
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<link rel="icon" href="assets/images/favicon.png">
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<meta name="generator" content="mkdocs-1.6.1, mkdocs-material-9.7.6">
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<title>KPN++</title>
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<link rel="stylesheet" href="assets/stylesheets/main.484c7ddc.min.css">
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<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
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<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CRoboto+Mono:400,400i,700,700i&display=fallback">
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<style>:root{--md-text-font:"Roboto";--md-code-font:"Roboto Mono"}</style>
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<script>__md_scope=new URL(".",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script>
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</head>
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<body dir="ltr" data-md-color-scheme="slate" data-md-color-primary="indigo" data-md-color-accent="indigo">
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<input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
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<label class="md-overlay" for="__drawer"></label>
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<div data-md-component="skip">
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<a href="#kpn" class="md-skip">
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Skip to content
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<header class="md-header" data-md-component="header">
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<nav class="md-header__inner md-grid" aria-label="Header">
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<a href="." title="KPN++" class="md-header__button md-logo" aria-label="KPN++" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg>
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KPN++
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<form class="md-header__option" data-md-component="palette">
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<input class="md-option" data-md-color-media="" data-md-color-scheme="slate" data-md-color-primary="indigo" data-md-color-accent="indigo" aria-hidden="true" type="radio" name="__palette" id="__palette_0">
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<script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script>
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<div class="md-search-result__meta">
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Initializing search
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<div class="md-header__source">
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<a href="https://gitea.tourolle.paris/dtourolle/KPN" title="Go to repository" class="md-source" data-md-component="source">
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<div class="md-source__icon md-icon">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M439.6 236.1 244 40.5c-5.4-5.5-12.8-8.5-20.4-8.5s-15 3-20.4 8.4L162.5 81l51.5 51.5c27.1-9.1 52.7 16.8 43.4 43.7l49.7 49.7c34.2-11.8 61.2 31 35.5 56.7-26.5 26.5-70.2-2.9-56-37.3L240.3 199v121.9c25.3 12.5 22.3 41.8 9.1 55-6.4 6.4-15.2 10.1-24.3 10.1s-17.8-3.6-24.3-10.1c-17.6-17.6-11.1-46.9 11.2-56v-123c-20.8-8.5-24.6-30.7-18.6-45L142.6 101 8.5 235.1C3 240.6 0 247.9 0 255.5s3 15 8.5 20.4l195.6 195.7c5.4 5.4 12.7 8.4 20.4 8.4s15-3 20.4-8.4l194.7-194.7c5.4-5.4 8.4-12.8 8.4-20.4s-3-15-8.4-20.4"/></svg>
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</div>
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<div class="md-source__repository">
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dtourolle/KPN
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</div>
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</a>
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</nav>
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</header>
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<div class="md-container" data-md-component="container">
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<nav class="md-tabs" aria-label="Tabs" data-md-component="tabs">
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<div class="md-grid">
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<ul class="md-tabs__list">
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<li class="md-tabs__item md-tabs__item--active">
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Home
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<li class="md-tabs__item">
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<a href="getting-started/" class="md-tabs__link">
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Getting Started
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</a>
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<li class="md-tabs__item">
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<a href="nodes/" class="md-tabs__link">
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Concepts
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<li class="md-tabs__item">
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<a href="error-handling/" class="md-tabs__link">
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Error Handling & Events
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</a>
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Advanced
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<a href="examples/" class="md-tabs__link">
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Examples
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</a>
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</nav>
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<main class="md-main" data-md-component="main">
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<div class="md-main__inner md-grid">
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<nav class="md-nav md-nav--primary md-nav--lifted" aria-label="Navigation" data-md-level="0">
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<a href="." title="KPN++" class="md-nav__button md-logo" aria-label="KPN++" data-md-component="logo">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg>
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</a>
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KPN++
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<div class="md-nav__source">
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<a href="https://gitea.tourolle.paris/dtourolle/KPN" title="Go to repository" class="md-source" data-md-component="source">
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><!--! Font Awesome Free 7.1.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2025 Fonticons, Inc.--><path d="M439.6 236.1 244 40.5c-5.4-5.5-12.8-8.5-20.4-8.5s-15 3-20.4 8.4L162.5 81l51.5 51.5c27.1-9.1 52.7 16.8 43.4 43.7l49.7 49.7c34.2-11.8 61.2 31 35.5 56.7-26.5 26.5-70.2-2.9-56-37.3L240.3 199v121.9c25.3 12.5 22.3 41.8 9.1 55-6.4 6.4-15.2 10.1-24.3 10.1s-17.8-3.6-24.3-10.1c-17.6-17.6-11.1-46.9 11.2-56v-123c-20.8-8.5-24.6-30.7-18.6-45L142.6 101 8.5 235.1C3 240.6 0 247.9 0 255.5s3 15 8.5 20.4l195.6 195.7c5.4 5.4 12.7 8.4 20.4 8.4s15-3 20.4-8.4l194.7-194.7c5.4-5.4 8.4-12.8 8.4-20.4s-3-15-8.4-20.4"/></svg>
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</div>
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<div class="md-source__repository">
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dtourolle/KPN
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-nav__toggle md-toggle" type="checkbox" id="__toc">
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<label class="md-nav__link md-nav__link--active" for="__toc">
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Home
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</label>
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<a href="." class="md-nav__link md-nav__link--active">
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Home
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<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
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<label class="md-nav__title" for="__toc">
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<span class="md-nav__icon md-icon"></span>
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Table of contents
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</label>
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#why-kpn" class="md-nav__link">
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<span class="md-ellipsis">
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Why KPN++?
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</a>
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<li class="md-nav__item">
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<a href="#quick-example" class="md-nav__link">
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Quick example
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<li class="md-nav__item">
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<a href="#install-build" class="md-nav__link">
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<span class="md-ellipsis">
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Install & build
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</a>
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</ul>
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</nav>
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<li class="md-nav__item">
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<a href="getting-started/" class="md-nav__link">
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<span class="md-ellipsis">
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Getting Started
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</a>
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<li class="md-nav__item md-nav__item--nested">
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<span class="md-ellipsis">
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Concepts
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<span class="md-nav__icon md-icon"></span>
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<span class="md-nav__icon md-icon"></span>
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<h1 id="kpn">KPN++<a class="headerlink" href="#kpn" title="Permanent link">¶</a></h1>
|
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<p>A C++20 <a href="https://en.wikipedia.org/wiki/Kahn_process_networks">Kahn Process Network</a> library. Each node wraps a plain function and runs concurrently, communicating with downstream nodes via bounded FIFO channels. Includes Python bindings via nanobind.</p>
|
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<hr />
|
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<h2 id="why-kpn">Why KPN++?<a class="headerlink" href="#why-kpn" title="Permanent link">¶</a></h2>
|
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<ul>
|
|
<li><strong>Zero boilerplate</strong> — wrap any callable as a node; types flow automatically from the function signature</li>
|
|
<li><strong>Bounded channels</strong> — backpressure is structural, not bolted on</li>
|
|
<li><strong>Observable</strong> — per-node and network-level callbacks for overflow and stop events; diagnostics snapshots; optional web UI</li>
|
|
<li><strong>Composable</strong> — <code>Network</code> for runtime wiring, <code>StaticNetwork</code> for compile-time topology with zero overhead</li>
|
|
</ul>
|
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<hr />
|
|
<h2 id="quick-example">Quick example<a class="headerlink" href="#quick-example" title="Permanent link">¶</a></h2>
|
|
<div class="language-cpp highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="cp">#include</span><span class="w"> </span><span class="cpf"><kpn/kpn.hpp></span>
|
|
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="k">using</span><span class="w"> </span><span class="k">namespace</span><span class="w"> </span><span class="nn">kpn</span><span class="p">;</span>
|
|
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3" href="#__codelineno-0-3"></a>
|
|
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4" href="#__codelineno-0-4"></a><span class="k">static</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">produce</span><span class="p">()</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="mi">42</span><span class="p">;</span><span class="w"> </span><span class="p">}</span>
|
|
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5" href="#__codelineno-0-5"></a><span class="k">static</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="nf">double_it</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">2</span><span class="p">;</span><span class="w"> </span><span class="p">}</span>
|
|
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6" href="#__codelineno-0-6"></a><span class="k">static</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">print_it</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">x</span><span class="p">)</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">cout</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="s">"result: "</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o"><<</span><span class="w"> </span><span class="sc">'\n'</span><span class="p">;</span><span class="w"> </span><span class="p">}</span>
|
|
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7" href="#__codelineno-0-7"></a>
|
|
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8" href="#__codelineno-0-8"></a><span class="kt">int</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
|
|
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9" href="#__codelineno-0-9"></a><span class="w"> </span><span class="n">Network</span><span class="w"> </span><span class="n">net</span><span class="p">;</span>
|
|
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10" href="#__codelineno-0-10"></a><span class="w"> </span><span class="n">net</span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="s">"src"</span><span class="p">,</span><span class="w"> </span><span class="n">src</span><span class="p">)</span>
|
|
</span><span id="__span-0-11"><a id="__codelineno-0-11" name="__codelineno-0-11" href="#__codelineno-0-11"></a><span class="w"> </span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="s">"dbl"</span><span class="p">,</span><span class="w"> </span><span class="n">dbl</span><span class="p">)</span>
|
|
</span><span id="__span-0-12"><a id="__codelineno-0-12" name="__codelineno-0-12" href="#__codelineno-0-12"></a><span class="w"> </span><span class="p">.</span><span class="n">add</span><span class="p">(</span><span class="s">"sink"</span><span class="p">,</span><span class="w"> </span><span class="n">sink</span><span class="p">)</span>
|
|
</span><span id="__span-0-13"><a id="__codelineno-0-13" name="__codelineno-0-13" href="#__codelineno-0-13"></a><span class="w"> </span><span class="p">.</span><span class="n">connect</span><span class="p">(</span><span class="s">"src"</span><span class="p">,</span><span class="w"> </span><span class="n">src</span><span class="p">.</span><span class="n">output</span><span class="o"><</span><span class="mi">0</span><span class="o">></span><span class="p">(),</span><span class="w"> </span><span class="s">"dbl"</span><span class="p">,</span><span class="w"> </span><span class="n">dbl</span><span class="p">.</span><span class="n">input</span><span class="o"><</span><span class="mi">0</span><span class="o">></span><span class="p">())</span>
|
|
</span><span id="__span-0-14"><a id="__codelineno-0-14" name="__codelineno-0-14" href="#__codelineno-0-14"></a><span class="w"> </span><span class="p">.</span><span class="n">connect</span><span class="p">(</span><span class="s">"dbl"</span><span class="p">,</span><span class="w"> </span><span class="n">dbl</span><span class="p">.</span><span class="n">output</span><span class="o"><</span><span class="mi">0</span><span class="o">></span><span class="p">(),</span><span class="w"> </span><span class="s">"sink"</span><span class="p">,</span><span class="w"> </span><span class="n">sink</span><span class="p">.</span><span class="n">input</span><span class="o"><</span><span class="mi">0</span><span class="o">></span><span class="p">())</span>
|
|
</span><span id="__span-0-15"><a id="__codelineno-0-15" name="__codelineno-0-15" href="#__codelineno-0-15"></a><span class="w"> </span><span class="p">.</span><span class="n">build</span><span class="p">();</span>
|
|
</span><span id="__span-0-16"><a id="__codelineno-0-16" name="__codelineno-0-16" href="#__codelineno-0-16"></a>
|
|
</span><span id="__span-0-17"><a id="__codelineno-0-17" name="__codelineno-0-17" href="#__codelineno-0-17"></a><span class="w"> </span><span class="n">net</span><span class="p">.</span><span class="n">start</span><span class="p">();</span>
|
|
</span><span id="__span-0-18"><a id="__codelineno-0-18" name="__codelineno-0-18" href="#__codelineno-0-18"></a><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">this_thread</span><span class="o">::</span><span class="n">sleep_for</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">chrono</span><span class="o">::</span><span class="n">milliseconds</span><span class="p">(</span><span class="mi">100</span><span class="p">));</span>
|
|
</span><span id="__span-0-19"><a id="__codelineno-0-19" name="__codelineno-0-19" href="#__codelineno-0-19"></a><span class="w"> </span><span class="n">net</span><span class="p">.</span><span class="n">stop</span><span class="p">();</span>
|
|
</span><span id="__span-0-20"><a id="__codelineno-0-20" name="__codelineno-0-20" href="#__codelineno-0-20"></a><span class="p">}</span>
|
|
</span></code></pre></div>
|
|
<hr />
|
|
<h2 id="install-build">Install & build<a class="headerlink" href="#install-build" title="Permanent link">¶</a></h2>
|
|
<div class="language-bash highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>cmake<span class="w"> </span>-B<span class="w"> </span>build
|
|
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>cmake<span class="w"> </span>--build<span class="w"> </span>build<span class="w"> </span>--parallel
|
|
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>ctest<span class="w"> </span>--test-dir<span class="w"> </span>build<span class="w"> </span><span class="c1"># unit tests + example smoke tests</span>
|
|
</span></code></pre></div>
|
|
<p>See <a href="getting-started/">Getting Started</a> for full build options.</p>
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