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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/patch_inplace/" rel="canonical"><link href=../patch/ rel=prev><link href=../push_back/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>patch_inplace - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><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> <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_jsonpatch_inplace 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 3.54"/></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 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></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> patch_inplace </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_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 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 12z"/></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_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 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 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 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 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 Line truncated
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</code></pre></div> <p><a href="http://jsonpatch.com"><abbr title="JavaScript Object Notation">JSON</abbr> Patch</a> defines a <abbr title="JavaScript Object Notation">JSON</abbr> document structure for expressing a sequence of operations to apply to a <abbr title="JavaScript Object Notation">JSON</abbr> document. With this function, a <abbr title="JavaScript Object Notation">JSON</abbr> Patch is applied to the current <abbr title="JavaScript Object Notation">JSON</abbr> value by executing all operations from the patch. This function applies a <abbr title="JavaScript Object Notation">JSON</abbr> patch in place and returns void.</p> <h2 id=parameters>Parameters<a class=headerlink href=#parameters title="Permanent link">¶</a></h2> <dl> <dt><code>json_patch</code> (in)</dt> <dd><abbr title="JavaScript Object Notation">JSON</abbr> patch document</dd> </dl> <h2 id=exception-safety>Exception safety<a class=headerlink href=#exception-safety title="Permanent link">¶</a></h2> <p>No guarantees, value may be corrupted by an unsuccessful patch operation.</p> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">¶</a></h2> <ul> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error104><code>parse_error.104</code></a> if the <abbr title="JavaScript Object Notation">JSON</abbr> patch does not consist of an array of objects.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error105><code>parse_error.105</code></a> if the <abbr title="JavaScript Object Notation">JSON</abbr> patch is malformed (e.g., mandatory attributes are missing); example: <code>"operation 'add' must have member 'path'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range401><code>out_of_range.401</code></a> if an array index is out of range.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error106><code>parse_error.106</code></a> if an array index in a "path" or "from" member begins with '0'; example: <code>"array index '01' must not begin with '0'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error107><code>parse_error.107</code></a> if a "path" or "from" member is not empty and does not begin with a slash (<code>/</code>); example: <code>"JSON pointer must be empty or begin with '/' - was: 'a'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error108><code>parse_error.108</code></a> if a tilde (<code>~</code>) in a "path" or "from" member is not followed by <code>0</code> or <code>1</code>; example: <code>"escape character '~' must be followed with '0' or '1'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error109><code>parse_error.109</code></a> if an array index in a "path" or "from" member is not a number; example: <code>"array index 'foo' is not a number"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range402><code>out_of_range.402</code></a> if the array index <code>-</code> is used where an existing element is required (the "path" of "replace", the "from" of "move" and "copy"); example: <code>"array index '-' (3) is out of range"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range403><code>out_of_range.403</code></a> if a <abbr title="JavaScript Object Notation">JSON</abbr> pointer inside the patch could not be resolved successfully in the current <abbr title="JavaScript Object Notation">JSON</abbr> value; example: <code>"key baz not found"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range404><code>out_of_range.404</code></a> if a reference token of a <abbr title="JavaScript Object Notation">JSON</abbr> pointer inside the patch cannot be resolved, e.g., <code>-</code> in a "remove" operation or <code>1a</code> for an array; example: <code>"unresolved reference token '-'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range405><code>out_of_range.405</code></a> if <abbr title="JavaScript Object Notation">JSON</abbr> pointer has no parent ("remove", "move")</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range411><code>out_of_range.411</code></a> if an "add" operation's target location has a parent that is neither an object nor an array.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range413><code>out_of_range.413</code></a> if a "remove" operation's target location has a parent that is neither an object nor an array.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range414><code>out_of_range.414</code></a> if a "move" operation's "from" location is a proper prefix of its "path" location.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionother_error501><code>other_error.501</code></a> if "test" operation was unsuccessful.</li> </ul> <h2 id=complexity>Complexity<a class=headerlink href=#complexity title="Permanent linkLine truncated
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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/patch_inplace/" rel="canonical"><link href=../patch/ rel=prev><link href=../push_back/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>patch_inplace - JSON for Modern C++</title><link rel=stylesheet href=../../../assets/stylesheets/main.ec1eaa64.min.css><link rel=stylesheet href=../../../assets/stylesheets/palette.ab4e12ef.min.css><link rel="stylesheet" href="../../../assets/external/fonts.googleapis.com/css.61a430c9.css"><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> <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_jsonpatch_inplace 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 3.54"/></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 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></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> patch_inplace </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_0> <label class="md-header__button md-icon" title="Switch to dark mode" for=__palette_1 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 12z"/></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_1> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_0 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 12s-1.44-4.5-3.5-5.45C10.26 6.2 11.11 6 12 6a6 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 12z"/></svg> </label> </form> <script>var palette=__md_get("__palette");if(palette&&palette.color){if("(prefers-color-scheme)"===palette.color.media){var media=matchMedia("(prefers-color-scheme: light)"),input=document.querySelector(media.matches?"[data-md-color-media='(prefers-color-scheme: light)']":"[data-md-color-media='(prefers-color-scheme: dark)']");palette.color.media=input.getAttribute("data-md-color-media"),palette.color.scheme=input.getAttribute("data-md-color-scheme"),palette.color.primary=input.getAttribute("data-md-color-primary"),palette.color.accent=input.getAttribute("data-md-color-accent")}for(var[key,value]of Object.entries(palette.color))document.body.setAttribute("data-md-color-"+key,value)}</script> <label class="md-header__button md-icon" for=__search> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M9.5 3A6.5 6.5 0 0 1 16 9.5c0 1.61-.59 3.09-1.56 4.23l.27.27h.79l5 5-1.5 1.5-5-5v-.79l-.27-.27A6.52 6.52 0 0 1 9.5 16 6.5 6.5 0 0 1 3 9.5 6.5 6.5 0 0 1 9.5 3m0 2C7 5 5 7 5 9.5S7 14 9.5 14 14 12 14 9.5 Line truncated
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</code></pre></div> <p><a href="http://jsonpatch.com"><abbr title="JavaScript Object Notation">JSON</abbr> Patch</a> defines a <abbr title="JavaScript Object Notation">JSON</abbr> document structure for expressing a sequence of operations to apply to a <abbr title="JavaScript Object Notation">JSON</abbr> document. With this function, a <abbr title="JavaScript Object Notation">JSON</abbr> Patch is applied to the current <abbr title="JavaScript Object Notation">JSON</abbr> value by executing all operations from the patch. This function applies a <abbr title="JavaScript Object Notation">JSON</abbr> patch in place and returns void.</p> <h2 id=parameters>Parameters<a class=headerlink href=#parameters title="Permanent link">¶</a></h2> <dl> <dt><code>json_patch</code> (in)</dt> <dd><abbr title="JavaScript Object Notation">JSON</abbr> patch document</dd> </dl> <h2 id=exception-safety>Exception safety<a class=headerlink href=#exception-safety title="Permanent link">¶</a></h2> <p>No guarantees, value may be corrupted by an unsuccessful patch operation.</p> <h2 id=exceptions>Exceptions<a class=headerlink href=#exceptions title="Permanent link">¶</a></h2> <ul> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error104><code>parse_error.104</code></a> if the <abbr title="JavaScript Object Notation">JSON</abbr> patch does not consist of an array of objects.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error105><code>parse_error.105</code></a> if the <abbr title="JavaScript Object Notation">JSON</abbr> patch is malformed (e.g., mandatory attributes are missing); example: <code>"operation 'add' must have member 'path'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range401><code>out_of_range.401</code></a> if an array index is out of range.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error106><code>parse_error.106</code></a> if an array index in a "path" or "from" member begins with '0'; example: <code>"array index '01' must not begin with '0'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error107><code>parse_error.107</code></a> if a "path" or "from" member is not empty and does not begin with a slash (<code>/</code>); example: <code>"JSON pointer must be empty or begin with '/' - was: 'a'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error108><code>parse_error.108</code></a> if a tilde (<code>~</code>) in a "path" or "from" member is not followed by <code>0</code> or <code>1</code>; example: <code>"escape character '~' must be followed with '0' or '1'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error109><code>parse_error.109</code></a> if an array index in a "path" or "from" member is not a number; example: <code>"array index 'foo' is not a number"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range402><code>out_of_range.402</code></a> if the array index <code>-</code> is used where an existing element is required (the "path" of "replace", the "from" of "move" and "copy"); example: <code>"array index '-' (3) is out of range"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range403><code>out_of_range.403</code></a> if a <abbr title="JavaScript Object Notation">JSON</abbr> pointer inside the patch could not be resolved successfully in the current <abbr title="JavaScript Object Notation">JSON</abbr> value; example: <code>"key 'baz' not found"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range404><code>out_of_range.404</code></a> if a reference token of a <abbr title="JavaScript Object Notation">JSON</abbr> pointer inside the patch cannot be resolved, e.g., <code>-</code> in a "remove" operation or <code>1a</code> for an array; example: <code>"unresolved reference token '-'"</code>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range405><code>out_of_range.405</code></a> if <abbr title="JavaScript Object Notation">JSON</abbr> pointer has no parent ("remove", "move")</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range411><code>out_of_range.411</code></a> if an "add" operation's target location has a parent that is neither an object nor an array.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range413><code>out_of_range.413</code></a> if a "remove" operation's target location has a parent that is neither an object nor an array.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionout_of_range414><code>out_of_range.414</code></a> if a "move" operation's "from" location is a proper prefix of its "path" location.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionother_error501><code>other_error.501</code></a> if "test" operation was unsuccessful. A "test" operation whose "path" does not exist is unsuccessful, too: the failed lookup is reporLine truncated
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<span class=cp>#include</span><span class=w> </span><span class=cpf><iomanip></span>
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<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></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>
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<span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>json</span><span class=p>;</span>
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<span class=k>using</span><span class=w> </span><span class=k>namespace</span><span class=w> </span><span class=nn>nlohmann</span><span class=o>::</span><span class=nn>literals</span><span class=p>;</span>
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<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
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@@ -26,13 +26,13 @@
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<span class=s> </span><span class=dl>)</span><span class=s>"</span><span class=n>_json</span><span class=p>;</span>
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<span class=w> </span><span class=c1>// output original document</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>"Before</span><span class=se>\n</span><span class=s>"</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>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>doc</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><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>"Before</span><span class=se>\n</span><span class=s>"</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>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>doc</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// apply the patch</span>
|
||||
<span class=w> </span><span class=n>doc</span><span class=p>.</span><span class=n>patch_inplace</span><span class=p>(</span><span class=n>patch</span><span class=p>);</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// output patched document</span>
|
||||
<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>"</span><span class=se>\n</span><span class=s>After</span><span class=se>\n</span><span class=s>"</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>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>doc</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><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>"</span><span class=se>\n</span><span class=s>After</span><span class=se>\n</span><span class=s>"</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>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>doc</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=err>Be</span><span class=kc>f</span><span class=err>ore</span>
|
||||
<span class=p>{</span>
|
||||
@@ -51,7 +51,7 @@
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><iomanip></span>
|
||||
<span class=cp>#include</span><span class=w> </span><span class=cpf><nlohmann/json.hpp></span>
|
||||
|
||||
<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=k>using</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=k>using</span><span class=w> </span><span class=k>namespace</span><span class=w> </span><span class=nn>nlohmann</span><span class=o>::</span><span class=nn>literals</span><span class=p>;</span>
|
||||
|
||||
<span class=kt>int</span><span class=w> </span><span class=nf>main</span><span class=p>()</span>
|
||||
@@ -83,11 +83,11 @@
|
||||
<span class=w> </span><span class=p>}</span>
|
||||
|
||||
<span class=w> </span><span class=c1>// the first operation has already been applied to doc</span>
|
||||
<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=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>doc</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><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=n>std</span><span class=o>::</span><span class=n>setw</span><span class=p>(</span><span class=mi>4</span><span class=p>)</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=n>doc</span><span class=w> </span><span class=o><<</span><span class=w> </span><span class=sc>'\n'</span><span class=p>;</span>
|
||||
<span class=p>}</span>
|
||||
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><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>.ou</span><span class=kc>t</span><span class=err>_o</span><span class=kc>f</span><span class=err>_ra</span><span class=kc>n</span><span class=err>ge.</span><span class=mi>403</span><span class=p>]</span><span class=w> </span><span class=err>key</span><span class=w> </span><span class=err>'</span><span class=kc>n</span><span class=err>o</span><span class=kc>ne</span><span class=err>xis</span><span class=kc>tent</span><span class=err>'</span><span class=w> </span><span class=kc>n</span><span class=err>o</span><span class=kc>t</span><span class=w> </span><span class=kc>f</span><span class=err>ou</span><span class=kc>n</span><span class=err>d</span>
|
||||
<span class=p>{</span>
|
||||
<span class=w> </span><span class=nt>"a"</span><span class=p>:</span><span class=w> </span><span class=mi>99</span><span class=p>,</span>
|
||||
<span class=w> </span><span class=nt>"b"</span><span class=p>:</span><span class=w> </span><span class=mi>2</span>
|
||||
<span class=p>}</span>
|
||||
</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="https://tools.ietf.org/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902 (<abbr title="JavaScript Object Notation">JSON</abbr> Patch)</a></li> <li><a href="https://tools.ietf.org/html/rfc6901"><abbr title="Request for Comments">RFC</abbr> 6901 (<abbr title="JavaScript Object Notation">JSON</abbr> Pointer)</a></li> <li><a href=../patch/ >patch</a> applies a <abbr title="JavaScript Object Notation">JSON</abbr> Patch</li> <li><a href=../merge_patch/ >merge_patch</a> applies a <abbr title="JavaScript Object Notation">JSON</abbr> Merge Patch</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ul> <li>Added in version 3.11.0.</li> <li>Added <a href=../../../home/exceptions/#jsonexceptionout_of_range411><code>out_of_range.411</code></a> and stopped relying on an internal assertion when an "add" operation's target location has a non-object/non-array parent in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>.</li> <li>Added <a href=../../../home/exceptions/#jsonexceptionout_of_range413><code>out_of_range.413</code></a> and stopped silently ignoring a "remove" operation whose target location has a non-object/non-array parent in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>.</li> <li>Added <a href=../../../home/exceptions/#jsonexceptionout_of_range414><code>out_of_range.414</code></a> and rejected a "move" operation whose "from" location is a proper prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error109><code>parse_error.109</code></a> instead of <a href=../../../home/exceptions/#jsonexceptionout_of_range404><code>out_of_range.404</code></a> for a one-character array index that is not a digit (e.g., <code>/x</code>) in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, as it already did for longer ones.</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 14, 2026 15:40:55 UTC">October 14, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var 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> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button 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 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <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 © 2013-2026 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 0 512 512"><!-- Font Awesome Free 7.1.0 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 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 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 3.6m-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 2.3m44.2-1.7c-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-.3-1.9-3-3.2-5.9-2.9M252.8 8C114.1 8 8 113.3 8 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-Line truncated
|
||||
</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="https://tools.ietf.org/html/rfc6902"><abbr title="Request for Comments">RFC</abbr> 6902 (<abbr title="JavaScript Object Notation">JSON</abbr> Patch)</a></li> <li><a href="https://tools.ietf.org/html/rfc6901"><abbr title="Request for Comments">RFC</abbr> 6901 (<abbr title="JavaScript Object Notation">JSON</abbr> Pointer)</a></li> <li><a href=../patch/ >patch</a> applies a <abbr title="JavaScript Object Notation">JSON</abbr> Patch</li> <li><a href=../merge_patch/ >merge_patch</a> applies a <abbr title="JavaScript Object Notation">JSON</abbr> Merge Patch</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ul> <li>Added in version 3.11.0.</li> <li>Added <a href=../../../home/exceptions/#jsonexceptionout_of_range411><code>out_of_range.411</code></a> and stopped relying on an internal assertion when an "add" operation's target location has a non-object/non-array parent in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>. This includes a <code>null</code> parent, which was previously silently converted to an object, in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>.</li> <li>Added <a href=../../../home/exceptions/#jsonexceptionout_of_range413><code>out_of_range.413</code></a> and stopped silently ignoring a "remove" operation whose target location has a non-object/non-array parent in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>.</li> <li>Added <a href=../../../home/exceptions/#jsonexceptionout_of_range414><code>out_of_range.414</code></a> and rejected a "move" operation whose "from" location is a proper prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>.</li> <li>Throws <a href=../../../home/exceptions/#jsonexceptionparse_error109><code>parse_error.109</code></a> instead of <a href=../../../home/exceptions/#jsonexceptionout_of_range404><code>out_of_range.404</code></a> for a one-character array index that is not a digit (e.g., <code>/x</code>) in version 3.13.0 <span class=unreleased-version title="Not part of a release yet; the latest release is 3.12.0.">unreleased</span>, as it already did for longer ones.</li> </ul> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossary --> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date" title="October 26, 2026 16:12:05 UTC">October 26, 2026</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var 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> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button 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 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <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 © 2013-2026 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 0 512 512"><!-- Font Awesome Free 7.1.0 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 2025 Fonticons, Inc.--><path d="M173.9 397.4c0 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 3.6m-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-Line truncated
|
||||
@@ -24,13 +24,13 @@ No guarantees, value may be corrupted by an unsuccessful patch operation.
|
||||
- Throws [`parse_error.108`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error108) if a tilde (`~`) in a "path" or "from" member is not followed by `0` or `1`; example: `"escape character '~' must be followed with '0' or '1'"`.
|
||||
- Throws [`parse_error.109`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error109) if an array index in a "path" or "from" member is not a number; example: `"array index 'foo' is not a number"`.
|
||||
- Throws [`out_of_range.402`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range402) if the array index `-` is used where an existing element is required (the "path" of "replace", the "from" of "move" and "copy"); example: `"array index '-' (3) is out of range"`.
|
||||
- Throws [`out_of_range.403`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range403) if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: `"key baz not found"`.
|
||||
- Throws [`out_of_range.403`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range403) if a JSON pointer inside the patch could not be resolved successfully in the current JSON value; example: `"key 'baz' not found"`.
|
||||
- Throws [`out_of_range.404`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range404) if a reference token of a JSON pointer inside the patch cannot be resolved, e.g., `-` in a "remove" operation or `1a` for an array; example: `"unresolved reference token '-'"`.
|
||||
- Throws [`out_of_range.405`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range405) if JSON pointer has no parent ("remove", "move")
|
||||
- Throws [`out_of_range.411`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range411) if an "add" operation's target location has a parent that is neither an object nor an array.
|
||||
- Throws [`out_of_range.413`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range413) if a "remove" operation's target location has a parent that is neither an object nor an array.
|
||||
- Throws [`out_of_range.414`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range414) if a "move" operation's "from" location is a proper prefix of its "path" location.
|
||||
- Throws [`other_error.501`](https://json.nlohmann.me/home/exceptions/#jsonexceptionother_error501) if "test" operation was unsuccessful.
|
||||
- Throws [`other_error.501`](https://json.nlohmann.me/home/exceptions/#jsonexceptionother_error501) if "test" operation was unsuccessful. A "test" operation whose "path" does not exist is unsuccessful, too: the failed lookup is reported as a failed test, even if the operation has no "value" member (which would otherwise be [`parse_error.105`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error105)). Which of the two errors is reported for this combination depends on the order in which the operands of a comparison are evaluated, so do not rely on it.
|
||||
|
||||
## Complexity
|
||||
|
||||
@@ -40,6 +40,8 @@ Linear in the size of the JSON value and the length of the JSON patch. As usuall
|
||||
|
||||
Unlike [`patch`](https://json.nlohmann.me/api/basic_json/patch/index.md), `patch_inplace` applies the operation "in place" and no copy of the JSON value is created. That makes it faster for large documents by avoiding the copy. However, the JSON value might be corrupted if the function throws an exception.
|
||||
|
||||
Duplicate member names inside an operation object are resolved by the parser before the patch is applied (the last one is kept, see [`object_t`](https://json.nlohmann.me/api/basic_json/object_t/#behavior)), so `{"op": "add", "op": "remove", "path": "/a"}` is a `remove` operation.
|
||||
|
||||
## Examples
|
||||
|
||||
Example: apply a JSON patch in place
|
||||
@@ -51,7 +53,7 @@ The following code shows how a JSON patch is applied to a value.
|
||||
#include <iomanip>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
using namespace nlohmann::literals;
|
||||
|
||||
int main()
|
||||
@@ -74,13 +76,13 @@ int main()
|
||||
)"_json;
|
||||
|
||||
// output original document
|
||||
std::cout << "Before\n" << std::setw(4) << doc << std::endl;
|
||||
std::cout << "Before\n" << std::setw(4) << doc << '\n';
|
||||
|
||||
// apply the patch
|
||||
doc.patch_inplace(patch);
|
||||
|
||||
// output patched document
|
||||
std::cout << "\nAfter\n" << std::setw(4) << doc << std::endl;
|
||||
std::cout << "\nAfter\n" << std::setw(4) << doc << '\n';
|
||||
}
|
||||
```
|
||||
|
||||
@@ -111,7 +113,7 @@ The following code shows a patch whose first operation succeeds and whose second
|
||||
#include <iomanip>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using nlohmann::json;
|
||||
using namespace nlohmann::literals;
|
||||
|
||||
int main()
|
||||
@@ -143,7 +145,7 @@ int main()
|
||||
}
|
||||
|
||||
// the first operation has already been applied to doc
|
||||
std::cout << std::setw(4) << doc << std::endl;
|
||||
std::cout << std::setw(4) << doc << '\n';
|
||||
}
|
||||
```
|
||||
|
||||
@@ -167,7 +169,7 @@ Output:
|
||||
## Version history
|
||||
|
||||
- Added in version 3.11.0.
|
||||
- Added [`out_of_range.411`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range411) and stopped relying on an internal assertion when an "add" operation's target location has a non-object/non-array parent in version 3.13.0 unreleased.
|
||||
- Added [`out_of_range.411`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range411) and stopped relying on an internal assertion when an "add" operation's target location has a non-object/non-array parent in version 3.13.0 unreleased. This includes a `null` parent, which was previously silently converted to an object, in version 3.13.0 unreleased.
|
||||
- Added [`out_of_range.413`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range413) and stopped silently ignoring a "remove" operation whose target location has a non-object/non-array parent in version 3.13.0 unreleased.
|
||||
- Added [`out_of_range.414`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range414) and rejected a "move" operation whose "from" location is a proper prefix of its "path" location instead of silently producing a corrupted result in version 3.13.0 unreleased.
|
||||
- Throws [`parse_error.109`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error109) instead of [`out_of_range.404`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range404) for a one-character array index that is not a digit (e.g., `/x`) in version 3.13.0 unreleased, as it already did for longer ones.
|
||||
Reference in new issue
Block a user