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id="326">326</span> <span id="327">327</span> <span id="328">328</span> <span id="329">329</span> <span id="330">330</span> </pre><pre class="rust"><code><span class="doccomment">//! An experimental SEIR model by https://github.com/omalaspinas/ glued to the traffic simulation.</span> <span class="doccomment">//! Transmission may occur when people spend time in shared spaces like buildings, bus stops, and</span> <span class="doccomment">//! buses.</span> <span class="kw">use</span> <span class="ident">std::ops</span>; <span class="kw">use</span> <span class="ident">anyhow::Result</span>; <span class="kw">pub</span> <span class="kw">use</span> <span class="ident">model</span>::{<span class="ident">Cmd</span>, <span class="ident">PandemicModel</span>}; <span class="kw">use</span> <span class="ident">rand::Rng</span>; <span class="kw">use</span> <span class="ident">rand_distr</span>::{<span class="ident">Distribution</span>, <span class="ident">Exp</span>, <span class="ident">Normal</span>}; <span class="kw">use</span> <span class="ident">rand_xorshift::XorShiftRng</span>; <span class="kw">use</span> <span class="ident">geom</span>::{<span class="ident">Duration</span>, <span class="ident">Time</span>}; <span class="kw">mod</span> <span class="ident">model</span>; <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">PartialOrd</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">AnyTime</span>(<span class="ident">f64</span>); <span class="kw">impl</span> <span class="ident">AnyTime</span> { <span class="kw">fn</span> <span class="ident">inner_seconds</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">f64</span> { <span class="self">self</span>.<span class="number">0</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_finite</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { <span class="self">self</span>.<span class="number">0</span>.<span class="ident">is_finite</span>() } } <span class="kw">impl</span> <span class="ident">ops::Add</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></span> <span class="kw">for</span> <span class="ident">AnyTime</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">AnyTime</span>; <span class="kw">fn</span> <span class="ident">add</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) -> <span class="ident">AnyTime</span> { <span class="ident">AnyTime</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">+</span> <span class="ident">other</span>.<span class="ident">inner_seconds</span>()) } } <span class="kw">impl</span> <span class="ident">ops::AddAssign</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></span> <span class="kw">for</span> <span class="ident">AnyTime</span> { <span class="kw">fn</span> <span class="ident">add_assign</span>(<span class="kw-2">&mut</span> <span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) { <span class="kw-2">*</span><span class="self">self</span> <span class="op">=</span> <span class="kw-2">*</span><span class="self">self</span> <span class="op">+</span> <span class="ident">other</span>; } } <span class="kw">impl</span> <span class="ident">ops::Sub</span><span class="op"><</span><span class="ident">Duration</span><span class="op">></span> <span class="kw">for</span> <span class="ident">AnyTime</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">AnyTime</span>; <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">Duration</span>) -> <span class="ident">AnyTime</span> { <span class="ident">AnyTime</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">-</span> <span class="ident">other</span>.<span class="ident">inner_seconds</span>()) } } <span class="kw">impl</span> <span class="ident">ops::Sub</span> <span class="kw">for</span> <span class="ident">AnyTime</span> { <span class="kw">type</span> <span class="ident">Output</span> <span class="op">=</span> <span class="ident">Duration</span>; <span class="kw">fn</span> <span class="ident">sub</span>(<span class="self">self</span>, <span class="ident">other</span>: <span class="ident">AnyTime</span>) -> <span class="ident">Duration</span> { <span class="ident">Duration::seconds</span>(<span class="self">self</span>.<span class="number">0</span> <span class="op">-</span> <span class="ident">other</span>.<span class="number">0</span>) } } <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">Time</span><span class="op">></span> <span class="kw">for</span> <span class="ident">AnyTime</span> { <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">t</span>: <span class="ident">Time</span>) -> <span class="ident">AnyTime</span> { <span class="ident">AnyTime</span>(<span class="ident">t</span>.<span class="ident">inner_seconds</span>()) } } <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">AnyTime</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Time</span> { <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">time</span>: <span class="ident">AnyTime</span>) -> <span class="self">Self</span> { <span class="ident">Time::START_OF_DAY</span> <span class="op">+</span> <span class="ident">Duration::seconds</span>(<span class="ident">time</span>.<span class="ident">inner_seconds</span>()) } } <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">f64</span><span class="op">></span> <span class="kw">for</span> <span class="ident">AnyTime</span> { <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">t</span>: <span class="ident">f64</span>) -> <span class="ident">AnyTime</span> { <span class="ident">AnyTime</span>(<span class="ident">t</span>) } } <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span> <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">StateEvent</span> { <span class="ident">Exposition</span>, <span class="ident">Incubation</span>, <span class="ident">Hospitalization</span>, <span class="ident">Recovery</span>, <span class="ident">Death</span>, } <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Event</span> { <span class="ident">s</span>: <span class="ident">StateEvent</span>, <span class="ident">p_hosp</span>: <span class="ident">f64</span>, <span class="comment">// probability of people being hospitalized after infection</span> <span class="ident">p_death</span>: <span class="ident">f64</span>, <span class="comment">// probability of dying after hospitalizaion</span> <span class="ident">t</span>: <span class="ident">AnyTime</span>, } <span class="kw">impl</span> <span class="ident">Event</span> { <span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">now</span>: <span class="ident">AnyTime</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">XorShiftRng</span>) -> <span class="ident">State</span> { <span class="kw">match</span> <span class="self">self</span>.<span class="ident">s</span> { <span class="ident">StateEvent::Exposition</span> => <span class="ident">State::Exposed</span>(( <span class="ident">Event</span> { <span class="ident">s</span>: <span class="ident">StateEvent::Incubation</span>, <span class="ident">p_hosp</span>: <span class="self">self</span>.<span class="ident">p_hosp</span>, <span class="ident">p_death</span>: <span class="self">self</span>.<span class="ident">p_death</span>, <span class="ident">t</span>: <span class="ident">now</span> <span class="op">+</span> <span class="ident">State::get_time_normal</span>(<span class="ident">State::T_INC</span>, <span class="ident">State::T_INC</span> <span class="op">/</span> <span class="number">2.0</span>, <span class="ident">rng</span>), }, <span class="ident">now</span>.<span class="ident">into</span>(), )), <span class="ident">StateEvent::Incubation</span> => { <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="self">self</span>.<span class="ident">p_death</span>) { <span class="ident">State::Infectious</span>(( <span class="ident">Event</span> { <span class="ident">s</span>: <span class="ident">StateEvent::Recovery</span>, <span class="ident">p_hosp</span>: <span class="self">self</span>.<span class="ident">p_hosp</span>, <span class="ident">p_death</span>: <span class="self">self</span>.<span class="ident">p_death</span>, <span class="ident">t</span>: <span class="ident">now</span> <span class="op">+</span> <span class="ident">State::get_time_normal</span>(<span class="ident">State::T_INF</span>, <span class="ident">State::T_INF</span> <span class="op">/</span> <span class="number">2.0</span>, <span class="ident">rng</span>), }, <span class="ident">now</span>.<span class="ident">into</span>(), )) } <span class="kw">else</span> { <span class="ident">State::Infectious</span>(( <span class="ident">Event</span> { <span class="ident">s</span>: <span class="ident">StateEvent::Hospitalization</span>, <span class="ident">p_hosp</span>: <span class="self">self</span>.<span class="ident">p_hosp</span>, <span class="ident">p_death</span>: <span class="self">self</span>.<span class="ident">p_death</span>, <span class="ident">t</span>: <span class="ident">now</span> <span class="op">+</span> <span class="ident">State::get_time_normal</span>(<span class="ident">State::T_INF</span>, <span class="ident">State::T_INF</span> <span class="op">/</span> <span class="number">2.0</span>, <span class="ident">rng</span>), }, <span class="ident">now</span>.<span class="ident">into</span>(), )) } } <span class="ident">StateEvent::Hospitalization</span> => { <span class="kw">if</span> <span class="ident">rng</span>.<span class="ident">gen_bool</span>(<span class="self">self</span>.<span class="ident">p_hosp</span>) { <span class="ident">State::Hospitalized</span>(( <span class="ident">Event</span> { <span class="ident">s</span>: <span class="ident">StateEvent::Recovery</span>, <span class="ident">p_hosp</span>: <span class="self">self</span>.<span class="ident">p_hosp</span>, <span class="ident">p_death</span>: <span class="self">self</span>.<span class="ident">p_death</span>, <span class="ident">t</span>: <span class="ident">now</span> <span class="op">+</span> <span class="ident">State::get_time_normal</span>(<span class="ident">State::T_INF</span>, <span class="ident">State::T_INF</span> <span class="op">/</span> <span class="number">2.0</span>, <span class="ident">rng</span>), }, <span class="ident">now</span>.<span class="ident">into</span>(), )) } <span class="kw">else</span> { <span class="ident">State::Hospitalized</span>(( <span class="ident">Event</span> { <span class="ident">s</span>: <span class="ident">StateEvent::Death</span>, <span class="ident">p_hosp</span>: <span class="self">self</span>.<span class="ident">p_hosp</span>, <span class="ident">p_death</span>: <span class="self">self</span>.<span class="ident">p_death</span>, <span class="ident">t</span>: <span class="ident">now</span> <span class="op">+</span> <span class="ident">State::get_time_normal</span>(<span class="ident">State::T_INF</span>, <span class="ident">State::T_INF</span> <span class="op">/</span> <span class="number">2.0</span>, <span class="ident">rng</span>), }, <span class="ident">now</span>.<span class="ident">into</span>(), )) } } <span class="ident">StateEvent::Death</span> => <span class="ident">State::Dead</span>(<span class="ident">now</span>.<span class="ident">into</span>()), <span class="ident">StateEvent::Recovery</span> => <span class="ident">State::Recovered</span>(<span class="ident">now</span>.<span class="ident">into</span>()), } } } <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>)]</span> <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">State</span> { <span class="ident">Sane</span>((<span class="ident">Event</span>, <span class="ident">Time</span>)), <span class="ident">Exposed</span>((<span class="ident">Event</span>, <span class="ident">Time</span>)), <span class="ident">Infectious</span>((<span class="ident">Event</span>, <span class="ident">Time</span>)), <span class="ident">Hospitalized</span>((<span class="ident">Event</span>, <span class="ident">Time</span>)), <span class="ident">Recovered</span>(<span class="ident">Time</span>), <span class="ident">Dead</span>(<span class="ident">Time</span>), } <span class="kw">impl</span> <span class="ident">State</span> { <span class="kw">const</span> <span class="ident">T_INF</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">360.0</span> <span class="op">*</span> <span class="number">10.0</span>; <span class="comment">// TODO dummy values</span> <span class="kw">const</span> <span class="ident">T_INC</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">3600.0</span>; <span class="comment">// TODO dummy values</span> <span class="kw">const</span> <span class="ident">R_0</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">2.5</span>; <span class="comment">// const S_RATIO: f64 = 0.985;</span> <span class="kw">const</span> <span class="ident">E_RATIO</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.01</span>; <span class="kw">const</span> <span class="ident">I_RATIO</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="number">0.05</span>; <span class="comment">// const R_RATIO: f64 = 0.0;</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ini_infectious_ratio</span>() -> <span class="ident">f64</span> { <span class="ident"><span class="self">Self</span>::I_RATIO</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">ini_exposed_ratio</span>() -> <span class="ident">f64</span> { <span class="ident"><span class="self">Self</span>::E_RATIO</span> } <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">p_hosp</span>: <span class="ident">f64</span>, <span class="ident">p_death</span>: <span class="ident">f64</span>) -> <span class="self">Self</span> { <span class="ident"><span class="self">Self</span>::Sane</span>(( <span class="ident">Event</span> { <span class="ident">s</span>: <span class="ident">StateEvent::Exposition</span>, <span class="ident">p_hosp</span>, <span class="ident">p_death</span>, <span class="ident">t</span>: <span class="ident">AnyTime::from</span>(<span class="ident">std::f64::INFINITY</span>), }, <span class="ident">Time::START_OF_DAY</span>, )) } <span class="kw">fn</span> <span class="ident">get_time_exp</span>(<span class="ident">lambda</span>: <span class="ident">f64</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">XorShiftRng</span>) -> <span class="ident">geom::Duration</span> { <span class="kw">let</span> <span class="ident">normal</span> <span class="op">=</span> <span class="ident">Exp::new</span>(<span class="ident">lambda</span>).<span class="ident">unwrap</span>(); <span class="ident">Duration::seconds</span>(<span class="ident">normal</span>.<span class="ident">sample</span>(<span class="ident">rng</span>)) } <span class="kw">fn</span> <span class="ident">get_time_normal</span>(<span class="ident">mu</span>: <span class="ident">f64</span>, <span class="ident">sigma</span>: <span class="ident">f64</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">XorShiftRng</span>) -> <span class="ident">geom::Duration</span> { <span class="kw">let</span> <span class="ident">normal</span> <span class="op">=</span> <span class="ident">Normal::new</span>(<span class="ident">mu</span>, <span class="ident">sigma</span>).<span class="ident">unwrap</span>(); <span class="ident">Duration::seconds</span>(<span class="ident">normal</span>.<span class="ident">sample</span>(<span class="ident">rng</span>)) } <span class="kw">fn</span> <span class="ident">is_sane</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { <span class="kw">match</span> <span class="self">self</span> { <span class="ident">State::Sane</span>((<span class="ident">ev</span>, <span class="kw">_</span>)) => <span class="op">!</span><span class="ident">ev</span>.<span class="ident">t</span>.<span class="ident">is_finite</span>(), <span class="kw">_</span> => <span class="bool-val">false</span>, } } <span class="kw">fn</span> <span class="ident">is_exposed</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { <span class="macro">matches!</span>(<span class="self">self</span>, <span class="ident">State::Exposed</span>(<span class="kw">_</span>)) } <span class="kw">fn</span> <span class="ident">is_infectious</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { <span class="macro">matches!</span>(<span class="self">self</span>, <span class="ident">State::Infectious</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident">State::Hospitalized</span>(<span class="kw">_</span>)) } <span class="kw">fn</span> <span class="ident">is_recovered</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { <span class="macro">matches!</span>(<span class="self">self</span>, <span class="ident">State::Recovered</span>(<span class="kw">_</span>)) } <span class="kw">fn</span> <span class="ident">is_dead</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="ident">bool</span> { <span class="macro">matches!</span>(<span class="self">self</span>, <span class="ident">State::Dead</span>(<span class="kw">_</span>)) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_time</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Time</span><span class="op">></span> { <span class="kw">match</span> <span class="self">self</span> { <span class="ident"><span class="self">Self</span>::Sane</span>(<span class="kw">_</span>) => <span class="prelude-val">None</span>, <span class="ident"><span class="self">Self</span>::Recovered</span>(<span class="ident">t</span>) <span class="op">|</span> <span class="ident"><span class="self">Self</span>::Dead</span>(<span class="ident">t</span>) <span class="op">|</span> <span class="ident"><span class="self">Self</span>::Exposed</span>((<span class="kw">_</span>, <span class="ident">t</span>)) <span class="op">|</span> <span class="ident"><span class="self">Self</span>::Infectious</span>((<span class="kw">_</span>, <span class="ident">t</span>)) <span class="op">|</span> <span class="ident"><span class="self">Self</span>::Hospitalized</span>((<span class="kw">_</span>, <span class="ident">t</span>)) => <span class="prelude-val">Some</span>(<span class="kw-2">*</span><span class="ident">t</span>), } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_event_time</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">AnyTime</span><span class="op">></span> { <span class="kw">match</span> <span class="self">self</span> { <span class="ident"><span class="self">Self</span>::Sane</span>((<span class="ident">ev</span>, <span class="kw">_</span>)) <span class="op">|</span> <span class="ident"><span class="self">Self</span>::Exposed</span>((<span class="ident">ev</span>, <span class="kw">_</span>)) <span class="op">|</span> <span class="ident"><span class="self">Self</span>::Infectious</span>((<span class="ident">ev</span>, <span class="kw">_</span>)) <span class="op">|</span> <span class="ident"><span class="self">Self</span>::Hospitalized</span>((<span class="ident">ev</span>, <span class="kw">_</span>)) => <span class="prelude-val">Some</span>(<span class="ident">ev</span>.<span class="ident">t</span>), <span class="ident"><span class="self">Self</span>::Recovered</span>(<span class="kw">_</span>) <span class="op">|</span> <span class="ident"><span class="self">Self</span>::Dead</span>(<span class="kw">_</span>) => <span class="prelude-val">None</span>, } } <span class="comment">// pub fn set_time(self, new_time: AnyTime) -> Self {</span> <span class="comment">// match self {</span> <span class="comment">// Self::Sane(Event {</span> <span class="comment">// s,</span> <span class="comment">// p_hosp,</span> <span class="comment">// p_death,</span> <span class="comment">// t: _,</span> <span class="comment">// }) => Self::Sane(Event {</span> <span class="comment">// s,</span> <span class="comment">// p_hosp,</span> <span class="comment">// p_death,</span> <span class="comment">// t: new_time,</span> <span class="comment">// }),</span> <span class="comment">// _ => unreachable!(),</span> <span class="comment">// }</span> <span class="comment">// }</span> <span class="comment">// TODO: not sure if we want an option here...</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">next_default</span>(<span class="self">self</span>, <span class="ident">default</span>: <span class="ident">AnyTime</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">XorShiftRng</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { <span class="comment">// TODO: when #![feature(bindings_after_at)] reaches stable</span> <span class="comment">// rewrite this part with it</span> <span class="kw">match</span> <span class="self">self</span> { <span class="ident"><span class="self">Self</span>::Sane</span>((<span class="ident">ev</span>, <span class="kw">_</span>)) => <span class="prelude-val">Some</span>(<span class="ident"><span class="self">Self</span>::Sane</span>((<span class="ident">ev</span>, <span class="ident">default</span>.<span class="ident">into</span>()))), <span class="ident"><span class="self">Self</span>::Exposed</span>((<span class="ident">ev</span>, <span class="kw">_</span>)) => <span class="prelude-val">Some</span>(<span class="ident">ev</span>.<span class="ident">next</span>(<span class="ident">default</span>, <span class="ident">rng</span>)), <span class="ident"><span class="self">Self</span>::Infectious</span>((<span class="ident">ev</span>, <span class="kw">_</span>)) => <span class="prelude-val">Some</span>(<span class="ident">ev</span>.<span class="ident">next</span>(<span class="ident">default</span>, <span class="ident">rng</span>)), <span class="ident"><span class="self">Self</span>::Hospitalized</span>((<span class="ident">ev</span>, <span class="kw">_</span>)) => <span class="prelude-val">Some</span>(<span class="ident">ev</span>.<span class="ident">next</span>(<span class="ident">default</span>, <span class="ident">rng</span>)), <span class="ident"><span class="self">Self</span>::Recovered</span>(<span class="kw">_</span>) => <span class="prelude-val">Some</span>(<span class="ident"><span class="self">Self</span>::Recovered</span>(<span class="ident">default</span>.<span class="ident">into</span>())), <span class="ident"><span class="self">Self</span>::Dead</span>(<span class="kw">_</span>) => <span class="prelude-val">Some</span>(<span class="ident"><span class="self">Self</span>::Dead</span>(<span class="ident">default</span>.<span class="ident">into</span>())), } } <span class="comment">// TODO: not sure if we want an option here...</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">next</span>(<span class="self">self</span>, <span class="ident">now</span>: <span class="ident">AnyTime</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">XorShiftRng</span>) -> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { <span class="comment">// TODO: when #![feature(bindings_after_at)] reaches stable</span> <span class="comment">// rewrite this part with it</span> <span class="kw">match</span> <span class="self">self</span> { <span class="ident"><span class="self">Self</span>::Sane</span>((<span class="ident">ev</span>, <span class="ident">t</span>)) => <span class="prelude-val">Some</span>(<span class="ident"><span class="self">Self</span>::Sane</span>((<span class="ident">ev</span>, <span class="ident">t</span>))), <span class="ident"><span class="self">Self</span>::Exposed</span>((<span class="ident">ev</span>, <span class="ident">t</span>)) => { <span class="kw">if</span> <span class="ident">ev</span>.<span class="ident">t</span> <span class="op"><</span><span class="op">=</span> <span class="ident">now</span> { <span class="prelude-val">Some</span>(<span class="ident">ev</span>.<span class="ident">next</span>(<span class="ident">now</span>, <span class="ident">rng</span>)) } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="ident"><span class="self">Self</span>::Exposed</span>((<span class="ident">ev</span>, <span class="ident">t</span>))) } } <span class="ident"><span class="self">Self</span>::Infectious</span>((<span class="ident">ev</span>, <span class="ident">t</span>)) => { <span class="kw">if</span> <span class="ident">ev</span>.<span class="ident">t</span> <span class="op"><</span><span class="op">=</span> <span class="ident">now</span> { <span class="prelude-val">Some</span>(<span class="ident">ev</span>.<span class="ident">next</span>(<span class="ident">now</span>, <span class="ident">rng</span>)) } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="ident"><span class="self">Self</span>::Infectious</span>((<span class="ident">ev</span>, <span class="ident">t</span>))) } } <span class="ident"><span class="self">Self</span>::Hospitalized</span>((<span class="ident">ev</span>, <span class="ident">t</span>)) => { <span class="kw">if</span> <span class="ident">ev</span>.<span class="ident">t</span> <span class="op"><</span><span class="op">=</span> <span class="ident">now</span> { <span class="prelude-val">Some</span>(<span class="ident">ev</span>.<span class="ident">next</span>(<span class="ident">now</span>, <span class="ident">rng</span>)) } <span class="kw">else</span> { <span class="prelude-val">Some</span>(<span class="ident"><span class="self">Self</span>::Hospitalized</span>((<span class="ident">ev</span>, <span class="ident">t</span>))) } } <span class="ident"><span class="self">Self</span>::Recovered</span>(<span class="ident">t</span>) => <span class="prelude-val">Some</span>(<span class="ident"><span class="self">Self</span>::Recovered</span>(<span class="ident">t</span>)), <span class="ident"><span class="self">Self</span>::Dead</span>(<span class="ident">t</span>) => <span class="prelude-val">Some</span>(<span class="ident"><span class="self">Self</span>::Dead</span>(<span class="ident">t</span>)), } } <span class="comment">// TODO: not sure if we want an option here... I guess here we want because we could have</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">start</span>(<span class="self">self</span>, <span class="ident">now</span>: <span class="ident">AnyTime</span>, <span class="ident">overlap</span>: <span class="ident">Duration</span>, <span class="ident">rng</span>: <span class="kw-2">&mut</span> <span class="ident">XorShiftRng</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> { <span class="comment">// rewrite this part with it</span> <span class="kw">match</span> <span class="self">self</span> { <span class="ident"><span class="self">Self</span>::Sane</span>((<span class="ident">ev</span>, <span class="ident">t</span>)) => { <span class="kw">if</span> <span class="ident">overlap</span> <span class="op">></span><span class="op">=</span> <span class="ident"><span class="self">Self</span>::get_time_exp</span>(<span class="ident">State::R_0</span> <span class="op">/</span> <span class="ident">State::T_INF</span>, <span class="ident">rng</span>) { <span class="prelude-val">Ok</span>(<span class="ident">ev</span>.<span class="ident">next</span>(<span class="ident">now</span>, <span class="ident">rng</span>)) } <span class="kw">else</span> { <span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::Sane</span>((<span class="ident">ev</span>, <span class="ident">t</span>))) } } <span class="kw">_</span> => <span class="macro">bail!</span>(<span class="string">"impossible to start from a non-sane situation."</span>,), } } } </code></pre></div> </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="sim" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0 (7737e0b5c 2022-04-04)" ></div> </body></html>