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deploy: 64bc4ee3184a40204d62ee57210c2a1a62fcee08
2020-10-08 21:07:51 +03:00
<!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 src="../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="shortcut icon" href="../../../favicon.ico"><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!"><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"><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>
deploy: 806d5d59dbe5f0501cec7b1ac88363dcf49eeb2c
2020-10-27 01:26:44 +03:00
<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#20-57' 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/1.0.59/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
deploy: 93c295b9aec2c5b2f21279194dbc19ba9a47de61
2020-10-09 07:03:46 +03:00
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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