abstreet/rustdoc/map_model/edits/compat/fn.upgrade.html
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<!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 `upgrade` fn in crate `map_model`."><meta name="keywords" content="rust, rustlang, rust-lang, upgrade"><title>map_model::edits::compat::upgrade - 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="../../../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><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></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><a href='../../../map_model/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="../../index.html">map_model</a>::<wbr><a href="../index.html">edits</a>::<wbr><a href="index.html">compat</a></p><script>window.sidebarCurrent = {name: "upgrade", ty: "fn", relpath: ""};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../../theme.js"></script><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><span class="help-button">?</span>
<a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><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/map_model/edits/compat.rs.html#21-72" title="goto source code">[src]</a></span><span class="in-band">Function <a href="../../index.html">map_model</a>::<wbr><a href="../index.html">edits</a>::<wbr><a href="index.html">compat</a>::<wbr><a class="fn" href="">upgrade</a></span></h1><pre class="rust fn">pub fn upgrade(value: <a class="enum" href="https://docs.rs/serde_json/1.0.61/serde_json/value/enum.Value.html" title="enum serde_json::value::Value">Value</a>, map: &amp;<a class="struct" href="../../../map_model/struct.Map.html" title="struct map_model::Map">Map</a>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="struct" href="../../../map_model/struct.PermanentMapEdits.html" title="struct map_model::PermanentMapEdits">PermanentMapEdits</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>&gt;</pre><div class="docblock"><p>When the PermanentMapEdits format changes, add a transformation here to automatically convert
edits written with the old format.</p>
<p>This problem is often solved with something like protocol buffers, but the resulting proto
usually winds up with permanent legacy fields, unless the changes are purely additive. For
example, protobufs wouldn't have helped with the fix_intersection_ids problem. Explicit
transformation is easier!</p>
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