<!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="Source of the Rust file `map_model&#x2F;src&#x2F;pathfind&#x2F;pathfinder.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>pathfinder.rs - source</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="../../../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../../storage.js"></script><script src="../../../crates.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../../map_model/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../../wheel.svg"></a></div></form></nav><section id="main" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">  1</span>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">std::cell::RefCell</span>;
<span class="kw">use</span> <span class="ident">std::collections::HashMap</span>;

<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Serialize</span>};
<span class="kw">use</span> <span class="ident">thread_local::ThreadLocal</span>;

<span class="kw">use</span> <span class="ident">abstutil</span>::{<span class="ident">Timer</span>, <span class="ident">VecMap</span>};
<span class="kw">use</span> <span class="ident">geom::Duration</span>;

<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::pathfind::engine::CreateEngine</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::pathfind::vehicles::VehiclePathfinder</span>;
<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::pathfind::walking::SidewalkPathfinder</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{
    <span class="ident">DirectedRoadID</span>, <span class="ident">Map</span>, <span class="ident">PathConstraints</span>, <span class="ident">PathRequest</span>, <span class="ident">PathV2</span>, <span class="ident">Position</span>, <span class="ident">RoutingParams</span>,
    <span class="ident">TransitRouteID</span>, <span class="ident">TransitStopID</span>,
};

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Serialize</span>, <span class="ident">Deserialize</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Pathfinder</span> {
    <span class="ident">car_graph</span>: <span class="ident">VehiclePathfinder</span>,
    <span class="ident">bike_graph</span>: <span class="ident">VehiclePathfinder</span>,
    <span class="ident">bus_graph</span>: <span class="ident">VehiclePathfinder</span>,
    <span class="ident">train_graph</span>: <span class="ident">VehiclePathfinder</span>,
    <span class="ident">walking_graph</span>: <span class="ident">SidewalkPathfinder</span>,
    <span class="ident">walking_with_transit_graph</span>: <span class="ident">SidewalkPathfinder</span>,

    <span class="comment">// These params cover the main graphs</span>
    <span class="ident">params</span>: <span class="ident">RoutingParams</span>,

    <span class="comment">// Callers can opt into caching with pathfind_with_params</span>
    <span class="comment">// TODO VecMap is probably fast enough. RoutingParams is annoying to implement Hash.</span>
    <span class="attribute">#[<span class="ident">serde</span>(<span class="ident">skip_serializing</span>, <span class="ident">skip_deserializing</span>)]</span>
    <span class="ident">cached_alternatives</span>: <span class="ident">ThreadLocal</span><span class="op">&lt;</span><span class="ident">RefCell</span><span class="op">&lt;</span><span class="ident">VecMap</span><span class="op">&lt;</span>(<span class="ident">PathConstraints</span>, <span class="ident">RoutingParams</span>), <span class="ident">Pathfinder</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>,
}

<span class="comment">// Implemented manually to deal with the ThreadLocal</span>
<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Pathfinder</span> {
    <span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self</span> {
        <span class="self">Self</span> {
            <span class="ident">car_graph</span>: <span class="self">self</span>.<span class="ident">car_graph</span>.<span class="ident">clone</span>(),
            <span class="ident">bike_graph</span>: <span class="self">self</span>.<span class="ident">bike_graph</span>.<span class="ident">clone</span>(),
            <span class="ident">bus_graph</span>: <span class="self">self</span>.<span class="ident">bus_graph</span>.<span class="ident">clone</span>(),
            <span class="ident">train_graph</span>: <span class="self">self</span>.<span class="ident">train_graph</span>.<span class="ident">clone</span>(),
            <span class="ident">walking_graph</span>: <span class="self">self</span>.<span class="ident">walking_graph</span>.<span class="ident">clone</span>(),
            <span class="ident">walking_with_transit_graph</span>: <span class="self">self</span>.<span class="ident">walking_with_transit_graph</span>.<span class="ident">clone</span>(),
            <span class="ident">params</span>: <span class="self">self</span>.<span class="ident">params</span>.<span class="ident">clone</span>(),
            <span class="ident">cached_alternatives</span>: <span class="ident">ThreadLocal::new</span>(),
        }
    }
}

<span class="kw">impl</span> <span class="ident">Pathfinder</span> {
    <span class="doccomment">/// Quickly create an invalid pathfinder, just to make borrow checking / initialization order</span>
    <span class="doccomment">/// work.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">empty</span>() -&gt; <span class="ident">Pathfinder</span> {
        <span class="ident">Pathfinder</span> {
            <span class="ident">car_graph</span>: <span class="ident">VehiclePathfinder::empty</span>(),
            <span class="ident">bike_graph</span>: <span class="ident">VehiclePathfinder::empty</span>(),
            <span class="ident">bus_graph</span>: <span class="ident">VehiclePathfinder::empty</span>(),
            <span class="ident">train_graph</span>: <span class="ident">VehiclePathfinder::empty</span>(),
            <span class="ident">walking_graph</span>: <span class="ident">SidewalkPathfinder::empty</span>(),
            <span class="ident">walking_with_transit_graph</span>: <span class="ident">SidewalkPathfinder::empty</span>(),
            <span class="ident">params</span>: <span class="ident">RoutingParams::default</span>(),
            <span class="ident">cached_alternatives</span>: <span class="ident">ThreadLocal::new</span>(),
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(
        <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>,
        <span class="ident">params</span>: <span class="ident">RoutingParams</span>,
        <span class="ident">engine</span>: <span class="ident">CreateEngine</span>,
        <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>,
    ) -&gt; <span class="ident">Pathfinder</span> {
        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;prepare pathfinding for cars&quot;</span>);
        <span class="kw">let</span> <span class="ident">car_graph</span> <span class="op">=</span> <span class="ident">VehiclePathfinder::new</span>(<span class="ident">map</span>, <span class="ident">PathConstraints::Car</span>, <span class="kw-2">&amp;</span><span class="ident">params</span>, <span class="kw-2">&amp;</span><span class="ident">engine</span>);
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;prepare pathfinding for cars&quot;</span>);

        <span class="comment">// The edge weights for bikes are so different from the driving graph that reusing the node</span>
        <span class="comment">// ordering actually hurts!</span>
        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;prepare pathfinding for bikes&quot;</span>);
        <span class="kw">let</span> <span class="ident">bike_graph</span> <span class="op">=</span> <span class="ident">VehiclePathfinder::new</span>(<span class="ident">map</span>, <span class="ident">PathConstraints::Bike</span>, <span class="kw-2">&amp;</span><span class="ident">params</span>, <span class="kw-2">&amp;</span><span class="ident">engine</span>);
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;prepare pathfinding for bikes&quot;</span>);

        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;prepare pathfinding for buses&quot;</span>);
        <span class="kw">let</span> <span class="ident">bus_graph</span> <span class="op">=</span> <span class="ident">VehiclePathfinder::new</span>(
            <span class="ident">map</span>,
            <span class="ident">PathConstraints::Bus</span>,
            <span class="kw-2">&amp;</span><span class="ident">params</span>,
            <span class="kw-2">&amp;</span><span class="ident">car_graph</span>.<span class="ident">engine</span>.<span class="ident">reuse_ordering</span>(),
        );
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;prepare pathfinding for buses&quot;</span>);

        <span class="comment">// Light rail networks are absolutely tiny; using a contraction hierarchy for them is</span>
        <span class="comment">// overkill. And in fact, it costs a bit of memory and file size, so don&#39;t do it!</span>
        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;prepare pathfinding for trains&quot;</span>);
        <span class="kw">let</span> <span class="ident">train_graph</span> <span class="op">=</span> <span class="ident">VehiclePathfinder::new</span>(
            <span class="ident">map</span>,
            <span class="ident">PathConstraints::Train</span>,
            <span class="kw-2">&amp;</span><span class="ident">params</span>,
            <span class="kw-2">&amp;</span><span class="ident">CreateEngine::Dijkstra</span>,
        );
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;prepare pathfinding for trains&quot;</span>);

        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;prepare pathfinding for pedestrians&quot;</span>);
        <span class="kw">let</span> <span class="ident">walking_graph</span> <span class="op">=</span> <span class="ident">SidewalkPathfinder::new</span>(<span class="ident">map</span>, <span class="prelude-val">None</span>, <span class="kw-2">&amp;</span><span class="ident">engine</span>);
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;prepare pathfinding for pedestrians&quot;</span>);

        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;prepare pathfinding for pedestrians using transit&quot;</span>);
        <span class="kw">let</span> <span class="ident">walking_with_transit_graph</span> <span class="op">=</span>
            <span class="ident">SidewalkPathfinder::new</span>(<span class="ident">map</span>, <span class="prelude-val">Some</span>((<span class="kw-2">&amp;</span><span class="ident">bus_graph</span>, <span class="kw-2">&amp;</span><span class="ident">train_graph</span>)), <span class="kw-2">&amp;</span><span class="ident">engine</span>);
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;prepare pathfinding for pedestrians using transit&quot;</span>);

        <span class="ident">Pathfinder</span> {
            <span class="ident">car_graph</span>,
            <span class="ident">bike_graph</span>,
            <span class="ident">bus_graph</span>,
            <span class="ident">train_graph</span>,
            <span class="ident">walking_graph</span>,
            <span class="ident">walking_with_transit_graph</span>,

            <span class="ident">params</span>,
            <span class="ident">cached_alternatives</span>: <span class="ident">ThreadLocal::new</span>(),
        }
    }

    <span class="doccomment">/// Create a new Pathfinder with custom routing params that can only serve some modes.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new_limited</span>(
        <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>,
        <span class="ident">params</span>: <span class="ident">RoutingParams</span>,
        <span class="ident">engine</span>: <span class="ident">CreateEngine</span>,
        <span class="ident">modes</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">PathConstraints</span><span class="op">&gt;</span>,
        <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>,
    ) -&gt; <span class="ident">Pathfinder</span> {
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">p</span> <span class="op">=</span> <span class="ident">Pathfinder::empty</span>();
        <span class="kw">for</span> <span class="ident">constraints</span> <span class="kw">in</span> <span class="ident">modes</span> {
            <span class="ident">timer</span>.<span class="ident">start</span>(<span class="macro">format!</span>(<span class="string">&quot;prepare pathfinding for just {:?}&quot;</span>, <span class="ident">constraints</span>));
            <span class="kw">match</span> <span class="ident">constraints</span> {
                <span class="ident">PathConstraints::Pedestrian</span> =&gt; {
                    <span class="ident">p</span>.<span class="ident">walking_graph</span> <span class="op">=</span> <span class="ident">SidewalkPathfinder::new</span>(<span class="ident">map</span>, <span class="prelude-val">None</span>, <span class="kw-2">&amp;</span><span class="ident">engine</span>);
                }
                <span class="ident">PathConstraints::Car</span> =&gt; {
                    <span class="ident">p</span>.<span class="ident">car_graph</span> <span class="op">=</span> <span class="ident">VehiclePathfinder::new</span>(<span class="ident">map</span>, <span class="ident">constraints</span>, <span class="kw-2">&amp;</span><span class="ident">params</span>, <span class="kw-2">&amp;</span><span class="ident">engine</span>);
                }
                <span class="ident">PathConstraints::Bike</span> =&gt; {
                    <span class="ident">p</span>.<span class="ident">bike_graph</span> <span class="op">=</span> <span class="ident">VehiclePathfinder::new</span>(<span class="ident">map</span>, <span class="ident">constraints</span>, <span class="kw-2">&amp;</span><span class="ident">params</span>, <span class="kw-2">&amp;</span><span class="ident">engine</span>);
                }
                <span class="ident">PathConstraints::Bus</span> =&gt; {
                    <span class="ident">p</span>.<span class="ident">bus_graph</span> <span class="op">=</span> <span class="ident">VehiclePathfinder::new</span>(<span class="ident">map</span>, <span class="ident">constraints</span>, <span class="kw-2">&amp;</span><span class="ident">params</span>, <span class="kw-2">&amp;</span><span class="ident">engine</span>);
                }
                <span class="ident">PathConstraints::Train</span> =&gt; {
                    <span class="ident">p</span>.<span class="ident">train_graph</span> <span class="op">=</span> <span class="ident">VehiclePathfinder::new</span>(<span class="ident">map</span>, <span class="ident">constraints</span>, <span class="kw-2">&amp;</span><span class="ident">params</span>, <span class="kw-2">&amp;</span><span class="ident">engine</span>);
                }
            }
            <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="macro">format!</span>(<span class="string">&quot;prepare pathfinding for just {:?}&quot;</span>, <span class="ident">constraints</span>));
        }
        <span class="ident">p</span>.<span class="ident">params</span> <span class="op">=</span> <span class="ident">params</span>;
        <span class="ident">p</span>
    }

    <span class="doccomment">/// Finds a path from a start to an end for a certain type of agent.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pathfind</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">req</span>: <span class="ident">PathRequest</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">PathV2</span><span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">pathfind_with_params</span>(<span class="ident">req</span>, <span class="ident">map</span>.<span class="ident">routing_params</span>(), <span class="bool-val">false</span>, <span class="ident">map</span>)
    }

    <span class="doccomment">/// Finds a path from a start to an end for a certain type of agent. May use custom routing</span>
    <span class="doccomment">/// parameters. If caching is requested and custom routing parameters are used, then the</span>
    <span class="doccomment">/// intermediate graph is saved to speed up future calls with the same routing parameters.</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">pathfind_with_params</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">req</span>: <span class="ident">PathRequest</span>,
        <span class="ident">params</span>: <span class="kw-2">&amp;</span><span class="ident">RoutingParams</span>,
        <span class="ident">cache_custom</span>: <span class="ident">bool</span>,
        <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>,
    ) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">PathV2</span><span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">constraints</span> <span class="op">=</span> <span class="ident">req</span>.<span class="ident">constraints</span>;
        <span class="kw">if</span> <span class="ident">params</span> <span class="op">==</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">params</span> {
            <span class="kw">return</span> <span class="kw">match</span> <span class="ident">constraints</span> {
                <span class="ident">PathConstraints::Pedestrian</span> =&gt; <span class="self">self</span>.<span class="ident">walking_graph</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>, <span class="ident">map</span>),
                <span class="ident">PathConstraints::Car</span> =&gt; <span class="self">self</span>.<span class="ident">car_graph</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>, <span class="ident">map</span>),
                <span class="ident">PathConstraints::Bike</span> =&gt; <span class="self">self</span>.<span class="ident">bike_graph</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>, <span class="ident">map</span>),
                <span class="ident">PathConstraints::Bus</span> =&gt; <span class="self">self</span>.<span class="ident">bus_graph</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>, <span class="ident">map</span>),
                <span class="ident">PathConstraints::Train</span> =&gt; <span class="self">self</span>.<span class="ident">train_graph</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>, <span class="ident">map</span>),
            };
        }

        <span class="comment">// If the params differ from the ones baked into the map, the CHs won&#39;t match. Do we have a</span>
        <span class="comment">// cached alternative?</span>
        <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">alt</span>) <span class="op">=</span> <span class="self">self</span>
            .<span class="ident">cached_alternatives</span>
            .<span class="ident">get_or</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">RefCell::new</span>(<span class="ident">VecMap::new</span>()))
            .<span class="ident">borrow</span>()
            .<span class="ident">get</span>(<span class="kw-2">&amp;</span>(<span class="ident">constraints</span>, <span class="ident">params</span>.<span class="ident">clone</span>()))
        {
            <span class="kw">return</span> <span class="ident">alt</span>.<span class="ident">pathfind_with_params</span>(<span class="ident">req</span>, <span class="ident">params</span>, <span class="bool-val">false</span>, <span class="ident">map</span>);
        }

        <span class="comment">// If somebody&#39;s repeatedly calling this without caching, log very obnoxiously.</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">timer</span> <span class="op">=</span> <span class="ident">Timer::new</span>(<span class="macro">format!</span>(<span class="string">&quot;Pathfinding slowly for {} with custom params&quot;</span>, <span class="ident">req</span>));
        <span class="kw">let</span> <span class="ident">tmp_pathfinder</span> <span class="op">=</span> <span class="ident">Pathfinder::new_limited</span>(
            <span class="ident">map</span>,
            <span class="ident">params</span>.<span class="ident">clone</span>(),
            <span class="ident">CreateEngine::Dijkstra</span>,
            <span class="macro">vec!</span>[<span class="ident">constraints</span>],
            <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">timer</span>,
        );
        <span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">tmp_pathfinder</span>.<span class="ident">pathfind_with_params</span>(<span class="ident">req</span>, <span class="ident">params</span>, <span class="bool-val">false</span>, <span class="ident">map</span>);
        <span class="kw">if</span> <span class="ident">cache_custom</span> {
            <span class="self">self</span>.<span class="ident">cached_alternatives</span>
                .<span class="ident">get_or</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">RefCell::new</span>(<span class="ident">VecMap::new</span>()))
                .<span class="ident">borrow_mut</span>()
                .<span class="ident">push</span>((<span class="ident">constraints</span>, <span class="ident">params</span>.<span class="ident">clone</span>()), <span class="ident">tmp_pathfinder</span>);
        }
        <span class="ident">result</span>
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">clear_custom_pathfinder_cache</span>(<span class="kw-2">&amp;</span><span class="self">self</span>) {
        <span class="self">self</span>.<span class="ident">cached_alternatives</span>
            .<span class="ident">get_or</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">RefCell::new</span>(<span class="ident">VecMap::new</span>()))
            .<span class="ident">borrow_mut</span>()
            .<span class="ident">clear</span>();
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">all_costs_from</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">req</span>: <span class="ident">PathRequest</span>,
        <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>,
    ) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">Duration</span>, <span class="ident">HashMap</span><span class="op">&lt;</span><span class="ident">DirectedRoadID</span>, <span class="ident">Duration</span><span class="op">&gt;</span>)<span class="op">&gt;</span> {
        <span class="kw">let</span> <span class="ident">req_cost</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pathfind</span>(<span class="ident">req</span>.<span class="ident">clone</span>(), <span class="ident">map</span>)<span class="question-mark">?</span>.<span class="ident">get_cost</span>();
        <span class="kw">let</span> <span class="ident">all_costs</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">req</span>.<span class="ident">constraints</span> {
            <span class="ident">PathConstraints::Pedestrian</span> =&gt; <span class="self">self</span>.<span class="ident">walking_graph</span>.<span class="ident">all_costs_from</span>(<span class="ident">req</span>.<span class="ident">start</span>, <span class="ident">map</span>),
            <span class="ident">PathConstraints::Car</span> =&gt; <span class="self">self</span>.<span class="ident">car_graph</span>.<span class="ident">all_costs_from</span>(<span class="ident">req</span>.<span class="ident">start</span>, <span class="ident">map</span>),
            <span class="ident">PathConstraints::Bike</span> =&gt; <span class="self">self</span>.<span class="ident">bike_graph</span>.<span class="ident">all_costs_from</span>(<span class="ident">req</span>.<span class="ident">start</span>, <span class="ident">map</span>),
            <span class="ident">PathConstraints::Bus</span> <span class="op">|</span> <span class="ident">PathConstraints::Train</span> =&gt; <span class="macro">unreachable!</span>(),
        };
        <span class="prelude-val">Some</span>((<span class="ident">req_cost</span>, <span class="ident">all_costs</span>))
    }

    <span class="comment">// TODO Consider returning the walking-only path in the failure case, to avoid wasting work</span>
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">should_use_transit</span>(
        <span class="kw-2">&amp;</span><span class="self">self</span>,
        <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>,
        <span class="ident">start</span>: <span class="ident">Position</span>,
        <span class="ident">end</span>: <span class="ident">Position</span>,
    ) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span>(<span class="ident">TransitStopID</span>, <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">TransitStopID</span><span class="op">&gt;</span>, <span class="ident">TransitRouteID</span>)<span class="op">&gt;</span> {
        <span class="self">self</span>.<span class="ident">walking_with_transit_graph</span>
            .<span class="ident">should_use_transit</span>(<span class="ident">map</span>, <span class="ident">start</span>, <span class="ident">end</span>)
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">apply_edits</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">map</span>: <span class="kw-2">&amp;</span><span class="ident">Map</span>, <span class="ident">timer</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Timer</span>) {
        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;apply edits to car pathfinding&quot;</span>);
        <span class="self">self</span>.<span class="ident">car_graph</span>.<span class="ident">apply_edits</span>(<span class="ident">map</span>);
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;apply edits to car pathfinding&quot;</span>);

        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;apply edits to bike pathfinding&quot;</span>);
        <span class="self">self</span>.<span class="ident">bike_graph</span>.<span class="ident">apply_edits</span>(<span class="ident">map</span>);
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;apply edits to bike pathfinding&quot;</span>);

        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;apply edits to bus pathfinding&quot;</span>);
        <span class="self">self</span>.<span class="ident">bus_graph</span>.<span class="ident">apply_edits</span>(<span class="ident">map</span>);
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;apply edits to bus pathfinding&quot;</span>);

        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;apply edits to train pathfinding&quot;</span>);
        <span class="self">self</span>.<span class="ident">train_graph</span>.<span class="ident">apply_edits</span>(<span class="ident">map</span>);
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;apply edits to train pathfinding&quot;</span>);

        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;apply edits to pedestrian pathfinding&quot;</span>);
        <span class="self">self</span>.<span class="ident">walking_graph</span>.<span class="ident">apply_edits</span>(<span class="ident">map</span>, <span class="prelude-val">None</span>);
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;apply edits to pedestrian pathfinding&quot;</span>);

        <span class="ident">timer</span>.<span class="ident">start</span>(<span class="string">&quot;apply edits to pedestrian using transit pathfinding&quot;</span>);
        <span class="self">self</span>.<span class="ident">walking_with_transit_graph</span>
            .<span class="ident">apply_edits</span>(<span class="ident">map</span>, <span class="prelude-val">Some</span>((<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">bus_graph</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">train_graph</span>)));
        <span class="ident">timer</span>.<span class="ident">stop</span>(<span class="string">&quot;apply edits to pedestrian using transit pathfinding&quot;</span>);
    }
}
</code></pre></div>
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