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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 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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 ("add", "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="PermaneLine 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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