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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/community/roadmap/" rel="canonical"><link href=../governance/ rel=prev><link href=../security_policy/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Roadmap - 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=#roadmap 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> Roadmap </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 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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 12 5 9.5 5"/></svg> </label> <div class=md-search data-mdLine 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=description content="JSON for Modern C++ is a header-only C++11 library that makes JSON a first-class data type."><meta name=author content="Niels Lohmann"><link href="https://json.nlohmann.me/community/roadmap/" rel="canonical"><link href=../governance/ rel=prev><link href=../security_policy/ rel=next><link rel=icon href=../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Roadmap - 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=../../css/custom.css><link rel=stylesheet href=../../css/brand.css><link rel=stylesheet href=../../css/fig-sax.css><link rel=stylesheet href=../../css/fig-jsonview.css><link rel=stylesheet href=../../css/fig-exceptions.css><link rel=stylesheet href=../../css/fig-pointer.css><link rel=stylesheet href=../../css/fig-charts.css><link rel=stylesheet href=../../css/fig-integration.css><link rel=stylesheet href=../../css/fig-macros.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=custom data-md-color-accent=custom> <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=#roadmap 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> <img src=../../images/wordmark-header.svg alt=logo> </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> Roadmap </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=custom data-md-color-accent=custom 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=custom data-md-color-accent=custom 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-Line truncated
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<span class=cp>#define JSON_USE_GLOBAL_UDLS 0</span>
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<span class=cp>#define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 0</span>
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<span class=cp>#define JSON_BRACE_INIT_COPY_SEMANTICS 1</span>
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@@ -8,4 +8,4 @@
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<span class=cp>#define JSON_DISABLE_TUPLE_REFERENCE_CONVERSION 1</span>
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<span class=cp>#define JSON_DELETE_DEPRECATED_FUNCTIONS 1</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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</code></pre></div> <p>The macros must be defined before the library header is included; setting them once in the build system is the easiest way to achieve this.</p> <h3 id=removal-of-deprecated-functions>Removal of deprecated functions<a class=headerlink href=#removal-of-deprecated-functions title="Permanent link">¶</a></h3> <p>Version 4.0 will remove all deprecated functions. Compiling with deprecation warnings enabled shows which of them your code still uses. Defining <a href=../../api/macros/json_delete_deprecated_functions/ ><code>JSON_DELETE_DEPRECATED_FUNCTIONS</code></a> to <code>1</code> turns these warnings into errors, as the deprecated functions are then deleted. The <a href=../../integration/migration_guide/#replace-deprecated-functions>migration guide</a> shows how to replace each of them.</p> <p>The <code>from_*</code> overloads taking a pointer and a length are not removed in version 4.0, but stay deleted. Without them, a call like <code>from_cbor(ptr, len)</code> would still compile: it would read <code>ptr</code> as a <abbr title="Null character (U+0000, byte value 0)">NUL</abbr>-terminated string and convert <code>len</code> to the <code>strict</code> parameter.</p> <table> <thead> <tr> <th>Deprecated</th> <th>Since</th> <th>Migration</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=k>operator</span><span class=o><<</span><span class=p>(</span><span class=n>basic_json</span><span class=o>&</span><span class=p>,</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>istream</span><span class=o>&</span><span class=p>)</span></code></td> <td>3.0.0</td> <td><a href=../../integration/migration_guide/#parsing>Parsing</a></td> </tr> <tr> <td><code class=highlight><span class=k>operator</span><span class=o>>></span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>basic_json</span><span class=o>&</span><span class=p>,</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>ostream</span><span class=o>&</span><span class=p>)</span></code></td> <td>3.0.0</td> <td><a href=../../integration/migration_guide/#miscellaneous-functions>Miscellaneous functions</a></td> </tr> <tr> <td><code>iterator_wrapper</code></td> <td>3.1.0</td> <td><a href=../../integration/migration_guide/#miscellaneous-functions>Miscellaneous functions</a></td> </tr> <tr> <td><a href=../../api/basic_json/parse/ ><code>parse</code></a>, <a href=../../api/basic_json/accept/ ><code>accept</code></a>, and <a href=../../api/basic_json/sax_parse/ ><code>sax_parse</code></a> with an initializer list <code>{ptr, len}</code> or <code>{first, last}</code></td> <td>3.8.0</td> <td><a href=../../integration/migration_guide/#parsing>Parsing</a></td> </tr> <tr> <td><a href=../../api/basic_json/from_bson/ ><code>from_bson</code></a>, <a href=../../api/basic_json/from_cbor/ ><code>from_cbor</code></a>, <a href=../../api/basic_json/from_msgpack/ ><code>from_msgpack</code></a>, and <a href=../../api/basic_json/from_ubjson/ ><code>from_ubjson</code></a> with <code>(ptr, len)</code> or an initializer list</td> <td>3.8.0</td> <td><a href=../../integration/migration_guide/#parsing>Parsing</a></td> </tr> <tr> <td><a href=../../api/json_pointer/operator_string_t/ ><code>json_pointer::operator string_t</code></a></td> <td>3.11.0</td> <td><a href=../../integration/migration_guide/#json-pointers><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</a></td> </tr> <tr> <td><a href=../../api/json_pointer/ ><code>json_pointer</code></a> with a <code>basic_json</code> type as template argument, and the overloads of <code>value</code>, <code>contains</code>, <code>operator[]</code>, and <code>at</code> accepting such a pointer</td> <td>3.11.0</td> <td><a href=../../integration/migration_guide/#json-pointers><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</a></td> </tr> <tr> <td>Comparing a <a href=../../api/json_pointer/ ><code>json_pointer</code></a> with a string via <a href=../../api/json_pointer/operator_eq/ ><code>operator==</code></a> or <a href=../../api/json_pointer/operator_ne/ ><code>operator!=</code></a></td> <td>3.11.2</td> <td><a href=../../integration/migration_guide/#json-pointers><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</a></td> </tr> <tr> <td><a href=../../api/basic_json/from_bjdata/ ><code>from_bjdata</code></a> and <a href=../../api/basic_json/from_bon8/ ><code>from_bon8</code></a> with <code>(ptr, len)</code></td> <td>3.13.0</td> <td><a href=../../integration/migration_guide/#parsing>Parsing</a></td> </tr> </tbody> </table> <p>The deprecated legacy comparison of discarded values is controlled by a macro and therefore listed in the table above.</p> <p>New breaking changes will follow the same path: they are added to these tables when they land in a 3.x release.</p> <!-- https://squidfunk.github.io/mkdocs-material/reference/tooltips/#adding-a-glossarLine truncated
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</code></pre></div> <p>The macros must be defined before the library header is included; setting them once in the build system is the easiest way to achieve this.</p> <h3 id=removal-of-deprecated-functions>Removal of deprecated functions<a class=headerlink href=#removal-of-deprecated-functions title="Permanent link">¶</a></h3> <p>Version 4.0 will remove all deprecated functions. Compiling with deprecation warnings enabled shows which of them your code still uses. Defining <a href=../../api/macros/json_delete_deprecated_functions/ ><code>JSON_DELETE_DEPRECATED_FUNCTIONS</code></a> to <code>1</code> turns these warnings into errors, as the deprecated functions are then deleted. The <a href=../../integration/migration_guide/#replace-deprecated-functions>migration guide</a> shows how to replace each of them.</p> <p>The <code>from_*</code> overloads taking a pointer and a length are not removed in version 4.0, but stay deleted. Without them, a call like <code>from_cbor(ptr, len)</code> would still compile: it would read <code>ptr</code> as a <abbr title="Null character (U+0000, byte value 0)">NUL</abbr>-terminated string and convert <code>len</code> to the <code>strict</code> parameter.</p> <table> <thead> <tr> <th>Deprecated</th> <th>Since</th> <th>Migration</th> </tr> </thead> <tbody> <tr> <td><code class=highlight><span class=k>operator</span><span class=o><<</span><span class=p>(</span><span class=n>basic_json</span><span class=o>&</span><span class=p>,</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>istream</span><span class=o>&</span><span class=p>)</span></code></td> <td>3.0.0</td> <td><a href=../../integration/migration_guide/#parsing>Parsing</a></td> </tr> <tr> <td><code class=highlight><span class=k>operator</span><span class=o>>></span><span class=p>(</span><span class=k>const</span><span class=w> </span><span class=n>basic_json</span><span class=o>&</span><span class=p>,</span><span class=w> </span><span class=n>std</span><span class=o>::</span><span class=n>ostream</span><span class=o>&</span><span class=p>)</span></code></td> <td>3.0.0</td> <td><a href=../../integration/migration_guide/#miscellaneous-functions>Miscellaneous functions</a></td> </tr> <tr> <td><code>iterator_wrapper</code></td> <td>3.1.0</td> <td><a href=../../integration/migration_guide/#miscellaneous-functions>Miscellaneous functions</a></td> </tr> <tr> <td><a href=../../api/basic_json/parse/ ><code>parse</code></a>, <a href=../../api/basic_json/accept/ ><code>accept</code></a>, and <a href=../../api/basic_json/sax_parse/ ><code>sax_parse</code></a> with an initializer list <code>{ptr, len}</code> or <code>{first, last}</code></td> <td>3.8.0</td> <td><a href=../../integration/migration_guide/#parsing>Parsing</a></td> </tr> <tr> <td><a href=../../api/basic_json/from_bson/ ><code>from_bson</code></a>, <a href=../../api/basic_json/from_cbor/ ><code>from_cbor</code></a>, <a href=../../api/basic_json/from_msgpack/ ><code>from_msgpack</code></a>, and <a href=../../api/basic_json/from_ubjson/ ><code>from_ubjson</code></a> with <code>(ptr, len)</code> or an initializer list</td> <td>3.8.0</td> <td><a href=../../integration/migration_guide/#parsing>Parsing</a></td> </tr> <tr> <td><a href=../../api/json_pointer/operator_string_t/ ><code>json_pointer::operator string_t</code></a></td> <td>3.11.0</td> <td><a href=../../integration/migration_guide/#json-pointers><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</a></td> </tr> <tr> <td><a href=../../api/json_pointer/ ><code>json_pointer</code></a> with a <code>basic_json</code> type as template argument, and the overloads of <code>value</code>, <code>contains</code>, <code>operator[]</code>, and <code>at</code> accepting such a pointer</td> <td>3.11.0</td> <td><a href=../../integration/migration_guide/#json-pointers><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</a></td> </tr> <tr> <td>Comparing a <a href=../../api/json_pointer/ ><code>json_pointer</code></a> with a string via <a href=../../api/json_pointer/operator_eq/ ><code>operator==</code></a> or <a href=../../api/json_pointer/operator_ne/ ><code>operator!=</code></a></td> <td>3.11.2</td> <td><a href=../../integration/migration_guide/#json-pointers><abbr title="JavaScript Object Notation">JSON</abbr> Pointers</a></td> </tr> <tr> <td><a href=../../api/basic_json/from_bjdata/ ><code>from_bjdata</code></a> and <a href=../../api/basic_json/from_bon8/ ><code>from_bon8</code></a> with <code>(ptr, len)</code></td> <td>3.13.0</td> <td><a href=../../integration/migration_guide/#parsing>Parsing</a></td> </tr> </tbody> </table> <p class=nj-table-caption>Deprecated functions, with the release that deprecated each one and the section of the migration guide that shows its replacement.</p> <p>The deprecated legacy comparison of discarded values is controlled by a macro and therefore listed in the table above.</p> <p>New breaking changes will follow the samLine truncated
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@@ -61,6 +61,10 @@ The plan for version 4.0 described below is not final and may still change: macr
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Version 4.0 will not be developed on a separate branch. Instead, every breaking change is first added to a 3.x release behind a macro whose default keeps the 3.x behavior. Version 4.0 then switches the defaults and removes the macros. Version 4.0 is therefore the sum of these macros: you can try it on the 3.x release train today by defining each macro to its 4.0 value and fixing what no longer compiles or behaves differently. Once your code works with all of them, it is ready for version 4.0.
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Each macro has a default value in 3.x and a different value in version 4.0. Define the macro to the 4.0 value to try it on the 3.x release train today; version 4.0 makes that value the default:
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Each row is one macro: the 3.x release that added it, its default in 3.x, and its value in version 4.0 (highlighted) or "removed". Versions on the 3.x lane are not to scale.
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The following macros guard changes that are planned to become the default in version 4.0:
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| Macro | 3.x default | 4.0 behavior | CMake option | Added |
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@@ -75,6 +79,8 @@ The following macros guard changes that are planned to become the default in ver
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| [`JSON_DISABLE_TUPLE_REFERENCE_CONVERSION`](https://json.nlohmann.me/api/macros/json_disable_tuple_reference_conversion/index.md) | `0` | `1`: a `basic_json` value can no longer be created from a one-element tuple of a reference to it, such as `std::forward_as_tuple(j)` | [`JSON_DisableTupleReferenceConversion`](https://json.nlohmann.me/integration/cmake/#json_disabletuplereferenceconversion) | 3.13.0 |
|
||||
| [`JSON_DELETE_DEPRECATED_FUNCTIONS`](https://json.nlohmann.me/api/macros/json_delete_deprecated_functions/index.md) | `0` | removed: the deprecated functions are removed (see below); the `from_*(ptr, len)` overloads stay deleted | [`JSON_DeleteDeprecatedFunctions`](https://json.nlohmann.me/integration/cmake/#json_deletedeprecatedfunctions) | 3.13.0 |
|
||||
|
||||
Opt-in macros for the version 4.0 behavior. "3.x default" is the value the library uses when the macro is not defined, "Added" is the release that introduced the macro, and – means there is no CMake option.
|
||||
|
||||
For example, the following makes a 3.x release behave like version 4.0 with respect to these changes:
|
||||
|
||||
```
|
||||
@@ -110,6 +116,8 @@ The `from_*` overloads taking a pointer and a length are not removed in version
|
||||
| Comparing a [`json_pointer`](https://json.nlohmann.me/api/json_pointer/index.md) with a string via [`operator==`](https://json.nlohmann.me/api/json_pointer/operator_eq/index.md) or [`operator!=`](https://json.nlohmann.me/api/json_pointer/operator_ne/index.md) | 3.11.2 | [JSON Pointers](https://json.nlohmann.me/integration/migration_guide/#json-pointers) |
|
||||
| [`from_bjdata`](https://json.nlohmann.me/api/basic_json/from_bjdata/index.md) and [`from_bon8`](https://json.nlohmann.me/api/basic_json/from_bon8/index.md) with `(ptr, len)` | 3.13.0 | [Parsing](https://json.nlohmann.me/integration/migration_guide/#parsing) |
|
||||
|
||||
Deprecated functions, with the release that deprecated each one and the section of the migration guide that shows its replacement.
|
||||
|
||||
The deprecated legacy comparison of discarded values is controlled by a macro and therefore listed in the table above.
|
||||
|
||||
New breaking changes will follow the same path: they are added to these tables when they land in a 3.x release.
|
||||
Reference in new issue
Block a user