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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/home/releases/unreleased/" rel="canonical"><link href=../ rel=prev><link href=../v3.12.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Unreleased - 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=#unreleased 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> Unreleased </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 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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 12 5 9.5 5"/></svg> </label> <div classLine 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/home/releases/unreleased/" rel="canonical"><link href=../ rel=prev><link href=../v3.12.0/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.7"><title>Unreleased - 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=#unreleased 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> Unreleased </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 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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 12 5 9.5 5"/></svg> </label> <div classLine truncated
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@@ -27,6 +27,7 @@ These changes are part of the `develop` branch, but not of a release yet.
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- [`basic_json::accept`](https://json.nlohmann.me/api/basic_json/accept/index.md): Extended overload (2) to accept heterogeneous iterator+sentinel pairs (C++20 ranges support) in version 3.13.0 unreleased.
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- [`basic_json::accept`](https://json.nlohmann.me/api/basic_json/accept/index.md): Parsing from an `std::istream` scans the characters in its stream buffer in bulk in version 3.13.0 unreleased ([`JSON_DISABLE_STREAM_BULK_SCAN`](https://json.nlohmann.me/api/macros/json_disable_stream_bulk_scan/index.md)).
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- [`basic_json::accept`](https://json.nlohmann.me/api/basic_json/accept/index.md): Parsing from a `FILE*` locks the file once instead of once per character in version 3.13.0 unreleased ([`JSON_DISABLE_UNLOCKED_FILE_IO`](https://json.nlohmann.me/api/macros/json_disable_unlocked_file_io/index.md)).
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- [`basic_json::accept`](https://json.nlohmann.me/api/basic_json/accept/index.md): Ill-formed UTF-16 and UTF-32 input (a lone surrogate, a high surrogate that is not followed by its low surrogate, or a code point above `U+10FFFF`) is rejected in version 3.13.0 unreleased; before that, some such sequences were accepted or ended the input silently.
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- [`basic_json::array_t`](https://json.nlohmann.me/api/basic_json/array_t/index.md): Made `capacity()` optional, so that array types such as `std::deque` can be used, in version 3.13.0 unreleased.
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- [`basic_json::at`](https://json.nlohmann.me/api/basic_json/at/index.md): Overload 3: Support for keys convertible to `std::string_view` added in version 3.13.0 unreleased, consistently across the lookup functions.
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- [`basic_json::basic_json`](https://json.nlohmann.me/api/basic_json/basic_json/index.md): Overload 4: Explicit for different string types if `JSON_USE_IMPLICIT_CONVERSIONS` is `0` since version 3.13.0 unreleased.
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@@ -86,6 +87,7 @@ These changes are part of the `develop` branch, but not of a release yet.
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- [`basic_json::parse`](https://json.nlohmann.me/api/basic_json/parse/index.md): Extended empty-input detection to also cover an `std::istream` without a stream buffer, and fixed a crash (`std::terminate`) when parsing from an `std::istream` with `eofbit` in its exception mask, in version 3.13.0 unreleased.
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- [`basic_json::parse`](https://json.nlohmann.me/api/basic_json/parse/index.md): Parsing from an `std::istream` scans the characters in its stream buffer in bulk in version 3.13.0 unreleased ([`JSON_DISABLE_STREAM_BULK_SCAN`](https://json.nlohmann.me/api/macros/json_disable_stream_bulk_scan/index.md) restores reading one character at a time).
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- [`basic_json::parse`](https://json.nlohmann.me/api/basic_json/parse/index.md): Parsing from a `FILE*` locks the file once instead of once per character in version 3.13.0 unreleased ([`JSON_DISABLE_UNLOCKED_FILE_IO`](https://json.nlohmann.me/api/macros/json_disable_unlocked_file_io/index.md) restores `std::fgetc`).
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- [`basic_json::parse`](https://json.nlohmann.me/api/basic_json/parse/index.md): Ill-formed UTF-16 and UTF-32 input (a lone surrogate, a high surrogate that is not followed by its low surrogate, or a code point above `U+10FFFF`) is rejected with `parse_error.101` in version 3.13.0 unreleased; before that, some such sequences were accepted or ended the input silently.
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- [`basic_json::parser_callback_t`](https://json.nlohmann.me/api/basic_json/parser_callback_t/index.md): Fixed in version 3.13.0 unreleased to also remove discarded values from a parent object; before, discarding an array or a value stored under an object key left a discarded member behind, which made the parse result serialize to invalid JSON.
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- [`basic_json::parser_callback_t`](https://json.nlohmann.me/api/basic_json/parser_callback_t/index.md): Fixed in version 3.13.0 unreleased so that discarding an array or object at its start event also hides its content from the callback, as documented above; before, the callback was still called for the content, and the key of every member of a discarded object was kept in memory until the parse ended.
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- [`basic_json::patch`](https://json.nlohmann.me/api/basic_json/patch/index.md): 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.
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@@ -103,6 +105,7 @@ These changes are part of the `develop` branch, but not of a release yet.
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- [`basic_json::sax_parse`](https://json.nlohmann.me/api/basic_json/sax_parse/index.md): `JSON_PRECISE_STREAM_POSITION` added in version 3.13.0 unreleased to optionally leave a `std::istream` positioned right after the parsed value when `strict` is `false`.
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- [`basic_json::sax_parse`](https://json.nlohmann.me/api/basic_json/sax_parse/index.md): Parsing from an `std::istream` scans the characters in its stream buffer in bulk in version 3.13.0 unreleased ([`JSON_DISABLE_STREAM_BULK_SCAN`](https://json.nlohmann.me/api/macros/json_disable_stream_bulk_scan/index.md)).
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- [`basic_json::sax_parse`](https://json.nlohmann.me/api/basic_json/sax_parse/index.md): Parsing from a `FILE*` locks the file once instead of once per character in version 3.13.0 unreleased ([`JSON_DISABLE_UNLOCKED_FILE_IO`](https://json.nlohmann.me/api/macros/json_disable_unlocked_file_io/index.md)).
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- [`basic_json::sax_parse`](https://json.nlohmann.me/api/basic_json/sax_parse/index.md): Ill-formed UTF-16 and UTF-32 input (a lone surrogate, a high surrogate that is not followed by its low surrogate, or a code point above `U+10FFFF`) is rejected with `parse_error.101` in version 3.13.0 unreleased; before that, some such sequences were accepted or ended the input silently.
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- [`std::hash<nlohmann::basic_json>`](https://json.nlohmann.me/api/basic_json/std_hash/index.md): Numbers that compare equal hash equally since version 3.13.0 unreleased; before, `0`, `0U`, and `0.0` had different hash values.
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- [`basic_json::string_t`](https://json.nlohmann.me/api/basic_json/string_t/index.md): Removed the requirement that `string_t` be implicitly convertible from `std::string`, which the BSON writer and the UBJSON reader relied on, in version 3.13.0 unreleased.
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- [`basic_json::swap`](https://json.nlohmann.me/api/basic_json/swap/index.md): Overload 1: Exchanges the `json_base_class_t` subobject along with the value since version 3.13.0 unreleased.
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