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@@ -498,4 +498,4 @@
|
||||
<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>402</span><span class=p>]</span><span class=w> </span><span class=err>array</span><span class=w> </span><span class=err>i</span><span class=kc>n</span><span class=err>dex</span><span class=w> </span><span class=err>'</span><span class=mi>-</span><span class=err>'</span><span class=w> </span><span class=err>(</span><span class=mi>2</span><span class=err>)</span><span class=w> </span><span class=err>is</span><span class=w> </span><span class=err>ou</span><span class=kc>t</span><span class=w> </span><span class=err>o</span><span class=kc>f</span><span class=w> </span><span class=err>ra</span><span class=kc>n</span><span class=err>ge</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>.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>f</span><span class=err>oo'</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=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>404</span><span class=p>]</span><span class=w> </span><span class=err>u</span><span class=kc>nres</span><span class=err>olved</span><span class=w> </span><span class=err>re</span><span class=kc>feren</span><span class=err>ce</span><span class=w> </span><span class=kc>t</span><span class=err>oke</span><span class=kc>n</span><span class=w> </span><span class=err>'</span><span class=kc>f</span><span class=err>oo'</span>
|
||||
</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li>documentation on <a href=../../../features/element_access/checked_access/ >checked access</a></li> <li><a href=../operator%5B%5D/ ><code>operator[]</code></a> for unchecked access by reference</li> <li><a href=../value/ ><code>value</code></a> for access with default value</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ol> <li>Added in version 1.0.0.</li> <li>Added in version 1.0.0.</li> <li>Added in version 3.11.0.</li> <li>Added in version 2.0.0.</li> </ol> <!-- 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="July 4, 2026 09:13:25 UTC">July 4, 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-.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 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- 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="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zM102.2 96a38.5 38.5 0 1 1 0 77 38.5 38.5 0 1 1 0-77m282.1 320h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9z"/></svg> </a> <a href="https://www.xing.com/profile/Niels_Lohmann" targetLine truncated
|
||||
</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li>documentation on <a href=../../../features/element_access/checked_access/ >checked access</a></li> <li><a href=../operator%5B%5D/ ><code>operator[]</code></a> for unchecked access by reference</li> <li><a href=../value/ ><code>value</code></a> for access with default value</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">¶</a></h2> <ol> <li>Added in version 1.0.0.</li> <li>Added in version 1.0.0.</li> <li>Added in version 3.11.0.</li> <li>Added in version 2.0.0.</li> </ol> <!-- 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="July 8, 2026 18:18:24 UTC">July 8, 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-.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 12.1C436.2 457.8 504 362.9 504 252 504 113.3 391.5 8 252.8 8M105.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2"/></svg> </a> <a href="https://www.linkedin.com/in/nielslohmann/" target="_blank" rel="noopener" title="www.linkedin.com" class="md-social__link"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 448 512"><!-- 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="M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zM102.2 96a38.5 38.5 0 1 1 0 77 38.5 38.5 0 1 1 0-77m282.1 320h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9z"/></svg> </a> <a href="https://www.xing.com/profile/Niels_Lohmann" targetLine truncated
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@@ -0,0 +1,668 @@
|
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# nlohmann::basic_json::at
|
||||
|
||||
```
|
||||
// (1)
|
||||
reference at(size_type idx);
|
||||
const_reference at(size_type idx) const;
|
||||
|
||||
// (2)
|
||||
reference at(const typename object_t::key_type& key);
|
||||
const_reference at(const typename object_t::key_type& key) const;
|
||||
|
||||
// (3)
|
||||
template<typename KeyType>
|
||||
reference at(KeyType&& key);
|
||||
template<typename KeyType>
|
||||
const_reference at(KeyType&& key) const;
|
||||
|
||||
// (4)
|
||||
reference at(const json_pointer& ptr);
|
||||
const_reference at(const json_pointer& ptr) const;
|
||||
```
|
||||
|
||||
1. Returns a reference to the array element at specified location `idx`, with bounds checking.
|
||||
1. Returns a reference to the object element with specified key `key`, with bounds checking.
|
||||
1. See 2. This overload is only available if `KeyType` is comparable with `typename object_t::key_type` and `typename object_comparator_t::is_transparent` denotes a type.
|
||||
1. Returns a reference to the element at specified JSON pointer `ptr`, with bounds checking.
|
||||
|
||||
## Template parameters
|
||||
|
||||
`KeyType` : A type for an object key other than [`json_pointer`](https://json.nlohmann.me/api/json_pointer/index.md) that is comparable with [`string_t`](https://json.nlohmann.me/api/basic_json/string_t/index.md) using [`object_comparator_t`](https://json.nlohmann.me/api/basic_json/object_comparator_t/index.md). This can also be a string view (C++17).
|
||||
|
||||
## Parameters
|
||||
|
||||
`idx` (in) : index of the element to access
|
||||
|
||||
`key` (in) : object key of the elements to access
|
||||
|
||||
`ptr` (in) : JSON pointer to the desired element
|
||||
|
||||
## Return value
|
||||
|
||||
1. reference to the element at index `idx`
|
||||
1. reference to the element at key `key`
|
||||
1. reference to the element at key `key`
|
||||
1. reference to the element pointed to by `ptr`
|
||||
|
||||
## Exception safety
|
||||
|
||||
Strong exception safety: if an exception occurs, the original value stays intact.
|
||||
|
||||
## Exceptions
|
||||
|
||||
1. The function can throw the following exceptions:
|
||||
- Throws [`type_error.304`](https://json.nlohmann.me/home/exceptions/#jsonexceptiontype_error304) if the JSON value is not an array; in this case, calling `at` with an index makes no sense. See the example below.
|
||||
- Throws [`out_of_range.401`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range401) if the index `idx` is out of range of the array; that is, `idx >= size()`. See the example below.
|
||||
1. The function can throw the following exceptions:
|
||||
- Throws [`type_error.304`](https://json.nlohmann.me/home/exceptions/#jsonexceptiontype_error304) if the JSON value is not an object; in this case, calling `at` with a key makes no sense. See the example below.
|
||||
- Throws [`out_of_range.403`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range403) if the key `key` is not stored in the object; that is, `find(key) == end()`. See the example below.
|
||||
1. See 2.
|
||||
1. The function can throw the following exceptions:
|
||||
- Throws [`parse_error.106`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error106) if an array index in the passed JSON pointer `ptr` begins with '0'. See the example below.
|
||||
- Throws [`parse_error.109`](https://json.nlohmann.me/home/exceptions/#jsonexceptionparse_error109) if an array index in the passed JSON pointer `ptr` is not a number. See the example below.
|
||||
- Throws [`out_of_range.401`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range401) if an array index in the passed JSON pointer `ptr` is out of range. See the example below.
|
||||
- Throws [`out_of_range.402`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range402) if the array index '-' is used in the passed JSON pointer `ptr`. As `at` provides checked access (and no elements are implicitly inserted), the index '-' is always invalid. See the example below.
|
||||
- Throws [`out_of_range.403`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range403) if the JSON pointer describes a key of an object which cannot be found. See the example below.
|
||||
- Throws [`out_of_range.404`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range404) if the JSON pointer `ptr` can not be resolved. See the example below.
|
||||
- Throws [`out_of_range.410`](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range410) if an array index in the passed JSON pointer `ptr` exceeds the range of `size_type` (e.g., on 32-bit platforms).
|
||||
|
||||
## Complexity
|
||||
|
||||
1. Constant.
|
||||
1. Logarithmic in the size of the container.
|
||||
1. Logarithmic in the size of the container.
|
||||
1. Logarithmic in the size of the container.
|
||||
|
||||
## Examples
|
||||
|
||||
Example: (1) access specified array element with bounds checking
|
||||
|
||||
The example below shows how array elements can be read and written using `at()`. It also demonstrates the different exceptions that can be thrown.
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create JSON array
|
||||
json array = {"first", "2nd", "third", "fourth"};
|
||||
|
||||
// output element at index 2 (third element)
|
||||
std::cout << array.at(2) << '\n';
|
||||
|
||||
// change element at index 1 (second element) to "second"
|
||||
array.at(1) = "second";
|
||||
|
||||
// output changed array
|
||||
std::cout << array << '\n';
|
||||
|
||||
// exception type_error.304
|
||||
try
|
||||
{
|
||||
// use at() on a non-array type
|
||||
json str = "I am a string";
|
||||
str.at(0) = "Another string";
|
||||
}
|
||||
catch (const json::type_error& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// exception out_of_range.401
|
||||
try
|
||||
{
|
||||
// try to write beyond the array limit
|
||||
array.at(5) = "sixth";
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
"third"
|
||||
["first","second","third","fourth"]
|
||||
[json.exception.type_error.304] cannot use at() with string
|
||||
[json.exception.out_of_range.401] array index 5 is out of range
|
||||
```
|
||||
|
||||
Example: (1) access specified array element with bounds checking
|
||||
|
||||
The example below shows how array elements can be read using `at()`. It also demonstrates the different exceptions that can be thrown.
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create JSON array
|
||||
const json array = {"first", "2nd", "third", "fourth"};
|
||||
|
||||
// output element at index 2 (third element)
|
||||
std::cout << array.at(2) << '\n';
|
||||
|
||||
// exception type_error.304
|
||||
try
|
||||
{
|
||||
// use at() on a non-array type
|
||||
const json str = "I am a string";
|
||||
std::cout << str.at(0) << '\n';
|
||||
}
|
||||
catch (const json::type_error& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// exception out_of_range.401
|
||||
try
|
||||
{
|
||||
// try to read beyond the array limit
|
||||
std::cout << array.at(5) << '\n';
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
"third"
|
||||
[json.exception.type_error.304] cannot use at() with string
|
||||
[json.exception.out_of_range.401] array index 5 is out of range
|
||||
```
|
||||
|
||||
Example: (2) access specified object element with bounds checking
|
||||
|
||||
The example below shows how object elements can be read and written using `at()`. It also demonstrates the different exceptions that can be thrown.
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create JSON object
|
||||
json object =
|
||||
{
|
||||
{"the good", "il buono"},
|
||||
{"the bad", "il cattivo"},
|
||||
{"the ugly", "il brutto"}
|
||||
};
|
||||
|
||||
// output element with key "the ugly"
|
||||
std::cout << object.at("the ugly") << '\n';
|
||||
|
||||
// change element with key "the bad"
|
||||
object.at("the bad") = "il cattivo";
|
||||
|
||||
// output changed array
|
||||
std::cout << object << '\n';
|
||||
|
||||
// exception type_error.304
|
||||
try
|
||||
{
|
||||
// use at() on a non-object type
|
||||
json str = "I am a string";
|
||||
str.at("the good") = "Another string";
|
||||
}
|
||||
catch (const json::type_error& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// exception out_of_range.401
|
||||
try
|
||||
{
|
||||
// try to write at a nonexisting key
|
||||
object.at("the fast") = "il rapido";
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
"il brutto"
|
||||
{"the bad":"il cattivo","the good":"il buono","the ugly":"il brutto"}
|
||||
[json.exception.type_error.304] cannot use at() with string
|
||||
[json.exception.out_of_range.403] key 'the fast' not found
|
||||
```
|
||||
|
||||
Example: (2) access specified object element with bounds checking
|
||||
|
||||
The example below shows how object elements can be read using `at()`. It also demonstrates the different exceptions that can be thrown.
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create JSON object
|
||||
const json object =
|
||||
{
|
||||
{"the good", "il buono"},
|
||||
{"the bad", "il cattivo"},
|
||||
{"the ugly", "il brutto"}
|
||||
};
|
||||
|
||||
// output element with key "the ugly"
|
||||
std::cout << object.at("the ugly") << '\n';
|
||||
|
||||
// exception type_error.304
|
||||
try
|
||||
{
|
||||
// use at() on a non-object type
|
||||
const json str = "I am a string";
|
||||
std::cout << str.at("the good") << '\n';
|
||||
}
|
||||
catch (const json::type_error& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// exception out_of_range.401
|
||||
try
|
||||
{
|
||||
// try to read from a nonexisting key
|
||||
std::cout << object.at("the fast") << '\n';
|
||||
}
|
||||
catch (const json::out_of_range)
|
||||
{
|
||||
std::cout << "out of range" << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
"il brutto"
|
||||
[json.exception.type_error.304] cannot use at() with string
|
||||
out of range
|
||||
```
|
||||
|
||||
Example: (3) access specified object element using string_view with bounds checking
|
||||
|
||||
The example below shows how object elements can be read and written using `at()`. It also demonstrates the different exceptions that can be thrown.
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <string_view>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using namespace std::string_view_literals;
|
||||
using json = nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create JSON object
|
||||
json object =
|
||||
{
|
||||
{"the good", "il buono"},
|
||||
{"the bad", "il cattivo"},
|
||||
{"the ugly", "il brutto"}
|
||||
};
|
||||
|
||||
// output element with key "the ugly" using string_view
|
||||
std::cout << object.at("the ugly"sv) << '\n';
|
||||
|
||||
// change element with key "the bad" using string_view
|
||||
object.at("the bad"sv) = "il cattivo";
|
||||
|
||||
// output changed array
|
||||
std::cout << object << '\n';
|
||||
|
||||
// exception type_error.304
|
||||
try
|
||||
{
|
||||
// use at() with string_view on a non-object type
|
||||
json str = "I am a string";
|
||||
str.at("the good"sv) = "Another string";
|
||||
}
|
||||
catch (const json::type_error& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// exception out_of_range.401
|
||||
try
|
||||
{
|
||||
// try to write at a nonexisting key using string_view
|
||||
object.at("the fast"sv) = "il rapido";
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
"il brutto"
|
||||
{"the bad":"il cattivo","the good":"il buono","the ugly":"il brutto"}
|
||||
[json.exception.type_error.304] cannot use at() with string
|
||||
[json.exception.out_of_range.403] key 'the fast' not found
|
||||
```
|
||||
|
||||
Example: (3) access specified object element using string_view with bounds checking
|
||||
|
||||
The example below shows how object elements can be read using `at()`. It also demonstrates the different exceptions that can be thrown.
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <string_view>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using namespace std::string_view_literals;
|
||||
using json = nlohmann::json;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create JSON object
|
||||
const json object =
|
||||
{
|
||||
{"the good", "il buono"},
|
||||
{"the bad", "il cattivo"},
|
||||
{"the ugly", "il brutto"}
|
||||
};
|
||||
|
||||
// output element with key "the ugly" using string_view
|
||||
std::cout << object.at("the ugly"sv) << '\n';
|
||||
|
||||
// exception type_error.304
|
||||
try
|
||||
{
|
||||
// use at() with string_view on a non-object type
|
||||
const json str = "I am a string";
|
||||
std::cout << str.at("the good"sv) << '\n';
|
||||
}
|
||||
catch (const json::type_error& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// exception out_of_range.401
|
||||
try
|
||||
{
|
||||
// try to read from a nonexisting key using string_view
|
||||
std::cout << object.at("the fast"sv) << '\n';
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << "out of range" << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
"il brutto"
|
||||
[json.exception.type_error.304] cannot use at() with string
|
||||
out of range
|
||||
```
|
||||
|
||||
Example: (4) access specified element via JSON Pointer
|
||||
|
||||
The example below shows how object elements can be read and written using `at()`. It also demonstrates the different exceptions that can be thrown.
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using namespace nlohmann::literals;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create a JSON value
|
||||
json j =
|
||||
{
|
||||
{"number", 1}, {"string", "foo"}, {"array", {1, 2}}
|
||||
};
|
||||
|
||||
// read-only access
|
||||
|
||||
// output element with JSON pointer "/number"
|
||||
std::cout << j.at("/number"_json_pointer) << '\n';
|
||||
// output element with JSON pointer "/string"
|
||||
std::cout << j.at("/string"_json_pointer) << '\n';
|
||||
// output element with JSON pointer "/array"
|
||||
std::cout << j.at("/array"_json_pointer) << '\n';
|
||||
// output element with JSON pointer "/array/1"
|
||||
std::cout << j.at("/array/1"_json_pointer) << '\n';
|
||||
|
||||
// writing access
|
||||
|
||||
// change the string
|
||||
j.at("/string"_json_pointer) = "bar";
|
||||
// output the changed string
|
||||
std::cout << j["string"] << '\n';
|
||||
|
||||
// change an array element
|
||||
j.at("/array/1"_json_pointer) = 21;
|
||||
// output the changed array
|
||||
std::cout << j["array"] << '\n';
|
||||
|
||||
// out_of_range.106
|
||||
try
|
||||
{
|
||||
// try to use an array index with leading '0'
|
||||
json::reference ref = j.at("/array/01"_json_pointer);
|
||||
}
|
||||
catch (const json::parse_error& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// out_of_range.109
|
||||
try
|
||||
{
|
||||
// try to use an array index that is not a number
|
||||
json::reference ref = j.at("/array/one"_json_pointer);
|
||||
}
|
||||
catch (const json::parse_error& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// out_of_range.401
|
||||
try
|
||||
{
|
||||
// try to use an invalid array index
|
||||
json::reference ref = j.at("/array/4"_json_pointer);
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// out_of_range.402
|
||||
try
|
||||
{
|
||||
// try to use the array index '-'
|
||||
json::reference ref = j.at("/array/-"_json_pointer);
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// out_of_range.403
|
||||
try
|
||||
{
|
||||
// try to use a JSON pointer to a nonexistent object key
|
||||
json::const_reference ref = j.at("/foo"_json_pointer);
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// out_of_range.404
|
||||
try
|
||||
{
|
||||
// try to use a JSON pointer that cannot be resolved
|
||||
json::reference ref = j.at("/number/foo"_json_pointer);
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
1
|
||||
"foo"
|
||||
[1,2]
|
||||
2
|
||||
"bar"
|
||||
[1,21]
|
||||
[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'
|
||||
[json.exception.parse_error.109] parse error: array index 'one' is not a number
|
||||
[json.exception.out_of_range.401] array index 4 is out of range
|
||||
[json.exception.out_of_range.402] array index '-' (2) is out of range
|
||||
[json.exception.out_of_range.403] key 'foo' not found
|
||||
[json.exception.out_of_range.404] unresolved reference token 'foo'
|
||||
```
|
||||
|
||||
Example: (4) access specified element via JSON Pointer
|
||||
|
||||
The example below shows how object elements can be read using `at()`. It also demonstrates the different exceptions that can be thrown.
|
||||
|
||||
```
|
||||
#include <iostream>
|
||||
#include <nlohmann/json.hpp>
|
||||
|
||||
using json = nlohmann::json;
|
||||
using namespace nlohmann::literals;
|
||||
|
||||
int main()
|
||||
{
|
||||
// create a JSON value
|
||||
const json j =
|
||||
{
|
||||
{"number", 1}, {"string", "foo"}, {"array", {1, 2}}
|
||||
};
|
||||
|
||||
// read-only access
|
||||
|
||||
// output element with JSON pointer "/number"
|
||||
std::cout << j.at("/number"_json_pointer) << '\n';
|
||||
// output element with JSON pointer "/string"
|
||||
std::cout << j.at("/string"_json_pointer) << '\n';
|
||||
// output element with JSON pointer "/array"
|
||||
std::cout << j.at("/array"_json_pointer) << '\n';
|
||||
// output element with JSON pointer "/array/1"
|
||||
std::cout << j.at("/array/1"_json_pointer) << '\n';
|
||||
|
||||
// out_of_range.109
|
||||
try
|
||||
{
|
||||
// try to use an array index that is not a number
|
||||
json::const_reference ref = j.at("/array/one"_json_pointer);
|
||||
}
|
||||
catch (const json::parse_error& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// out_of_range.401
|
||||
try
|
||||
{
|
||||
// try to use an invalid array index
|
||||
json::const_reference ref = j.at("/array/4"_json_pointer);
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// out_of_range.402
|
||||
try
|
||||
{
|
||||
// try to use the array index '-'
|
||||
json::const_reference ref = j.at("/array/-"_json_pointer);
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// out_of_range.403
|
||||
try
|
||||
{
|
||||
// try to use a JSON pointer to a nonexistent object key
|
||||
json::const_reference ref = j.at("/foo"_json_pointer);
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
|
||||
// out_of_range.404
|
||||
try
|
||||
{
|
||||
// try to use a JSON pointer that cannot be resolved
|
||||
json::const_reference ref = j.at("/number/foo"_json_pointer);
|
||||
}
|
||||
catch (const json::out_of_range& e)
|
||||
{
|
||||
std::cout << e.what() << '\n';
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
Output:
|
||||
|
||||
```
|
||||
1
|
||||
"foo"
|
||||
[1,2]
|
||||
2
|
||||
[json.exception.parse_error.109] parse error: array index 'one' is not a number
|
||||
[json.exception.out_of_range.401] array index 4 is out of range
|
||||
[json.exception.out_of_range.402] array index '-' (2) is out of range
|
||||
[json.exception.out_of_range.403] key 'foo' not found
|
||||
[json.exception.out_of_range.404] unresolved reference token 'foo'
|
||||
```
|
||||
|
||||
## See also
|
||||
|
||||
- documentation on [checked access](https://json.nlohmann.me/features/element_access/checked_access/index.md)
|
||||
- [`operator[]`](https://json.nlohmann.me/api/basic_json/operator%5B%5D/index.md) for unchecked access by reference
|
||||
- [`value`](https://json.nlohmann.me/api/basic_json/value/index.md) for access with default value
|
||||
|
||||
## Version history
|
||||
|
||||
1. Added in version 1.0.0.
|
||||
1. Added in version 1.0.0.
|
||||
1. Added in version 3.11.0.
|
||||
1. Added in version 2.0.0.
|
||||
Reference in new issue
Block a user