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25 lines
74 KiB
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=author content="Niels Lohmann"><link href=https://json.nlohmann.me/api/basic_json/invalid_iterator/ rel=canonical><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.4.2, mkdocs-material-8.5.10"><title>invalid_iterator - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.975780f9.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.2505c338.min.css><link rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Roboto";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/custom.css><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></head> <body dir=ltr data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo> <script>var palette=__md_get("__palette");if(palette&&"object"==typeof palette.color)for(var key of Object.keys(palette.color))document.body.setAttribute("data-md-color-"+key,palette.color[key])</script> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#nlohmannbasic_jsoninvalid_iterator class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class=md-header data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title="JSON for Modern C++" class="md-header__button md-logo" aria-label="JSON for Modern C++" data-md-component=logo> <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 3.54Z"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3V6m0 5h18v2H3v-2m0 5h18v2H3v-2Z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> JSON for Modern C++ </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> invalid_iterator </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media="(prefers-color-scheme: light)" data-md-color-scheme=default data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to dark mode" type=radio name=__palette id=__palette_1> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_2 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a4 4 0 0 0-4 4 4 4 0 0 0 4 4 4 4 0 0 0 4-4 4 4 0 0 0-4-4m0 10a6 6 0 0 1-6-6 6 6 0 0 1 6-6 6 6 0 0 1 6 6 6 6 0 0 1-6 6m8-9.31V4h-4.69L12 .69 8.69 4H4v4.69L.69 12 4 15.31V20h4.69L12 23.31 15.31 20H20v-4.69L23.31 12 20 8.69Z"/></svg> </label> <input class=md-option data-md-color-media="(prefers-color-scheme: dark)" data-md-color-scheme=slate data-md-color-primary=indigo data-md-color-accent=indigo aria-label="Switch to light mode" type=radio name=__palette id=__palette_2> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 18c-.89 0-1.74-.2-2.5-.55C11.56 16.5 13 14.42 13 12c0-2.42-1.44-4.5-3.5-5.45C
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</code></pre></div> <p>This exception is thrown if iterators passed to a library function do not match the expected semantics.</p> <p>Exceptions have ids 2xx (see <a href=../../../home/exceptions/#iterator-errors>list of iterator errors</a>).</p> <p><img src="data:image/svg+xml;base64,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<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span><span class=cp></span>
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<span class=k>using</span><span class=w> </span><span class=n>json</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span><span class=w></span>
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<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span><span class=w></span>
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<span class=p>{</span><span class=w></span>
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<span class=w> </span><span class=k>try</span><span class=w></span>
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<span class=w> </span><span class=p>{</span><span class=w></span>
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<span class=w> </span><span class=c1>// calling iterator::key() on non-object iterator</span>
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<span class=w> </span><span class=n>json</span><span class=w> </span><span class=n>j</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"string"</span><span class=p>;</span><span class=w></span>
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<span class=w> </span><span class=n>json</span><span class=o>::</span><span class=n>iterator</span><span class=w> </span><span class=n>it</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>j</span><span class=p>.</span><span class=n>begin</span><span class=p>();</span><span class=w></span>
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<span class=w> </span><span class=k>auto</span><span class=w> </span><span class=n>k</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>it</span><span class=p>.</span><span class=n>key</span><span class=p>();</span><span class=w></span>
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<span class=w> </span><span class=p>}</span><span class=w></span>
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<span class=w> </span><span class=k>catch</span><span class=w> </span><span class=p>(</span><span class=n>json</span><span class=o>::</span><span class=n>invalid_iterator</span><span class=o>&</span><span class=w> </span><span class=n>e</span><span class=p>)</span><span class=w></span>
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<span class=w> </span><span class=p>{</span><span class=w></span>
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<span class=w> </span><span class=c1>// output exception information</span>
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<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>"message: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>what</span><span class=p>()</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=w></span>
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<span class=w> </span><span class=o><<</span><span class=w> </span><span class=s>"exception id: "</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>e</span><span class=p>.</span><span class=n>id</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>endl</span><span class=p>;</span><span class=w></span>
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<span class=w> </span><span class=p>}</span><span class=w></span>
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<span class=p>}</span><span class=w></span>
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</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=err>message</span><span class=p>:</span><span class=w> </span><span class=p>[</span><span class=err>jso</span><span class=kc>n</span><span class=err>.excep</span><span class=kc>t</span><span class=err>io</span><span class=kc>n</span><span class=err>.i</span><span class=kc>n</span><span class=err>valid_i</span><span class=kc>terat</span><span class=err>or.</span><span class=mi>207</span><span class=p>]</span><span class=w> </span><span class=err>ca</span><span class=kc>nn</span><span class=err>o</span><span class=kc>t</span><span class=w> </span><span class=err>use</span><span class=w> </span><span class=err>key()</span><span class=w> </span><span class=kc>f</span><span class=err>or</span><span class=w> </span><span class=kc>n</span><span class=err>o</span><span class=kc>n</span><span class=mi>-</span><span class=err>objec</span><span class=kc>t</span><span class=w> </span><span class=err>i</span><span class=kc>terat</span><span class=err>ors</span><span class=w></span>
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<span class=err>excep</span><span class=kc>t</span><span class=err>io</span><span class=kc>n</span><span class=w> </span><span class=err>id</span><span class=p>:</span><span class=w> </span><span class=mi>207</span><span class=w></span>
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</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../../../home/exceptions/#iterator-errors>List of iterator errors</a></li> <li><a href=../parse_error/ ><code>parse_error</code></a> for exceptions indicating a parse error</li> <li><a href=../type_error/ ><code>type_error</code></a> for exceptions indicating executing a member function with a wrong type</li> <li><a href=../out_of_range/ ><code>out_of_range</code></a> for exceptions indicating access out of the defined range</li> <li><a href=../other_error/ ><code>other_error</code></a> for exceptions indicating other library errors</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ul> <li>Since version 3.0.0.</li> </ul> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">March 8, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> </div> <a href=# class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../insert/ class="md-footer__link md-footer__link--prev" aria-label="Previous: insert" rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> insert </div> </div> </a> <a href=../is_array/ class="md-footer__link md-footer__link--next" aria-label="Next: is_array" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> is_array </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2013 - 2022 Niels Lohmann </div> </div> <div class=md-social> <a href=https://github.com/nlohmann target=_blank rel=noopener title=github.com class=md-social__link> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 496 512"><!-- Font Awesome Free 6.2.1 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 2022 Fonticons, Inc.--><path d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.
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