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</code></pre></div> <p>This macro indicates whether the standard library has any support for RTTI (run time type information). Possible values are <code>1</code> when supported or <code>0</code> when unsupported.</p> <h2 id=default-definition>Default definition<a class=headerlink href=#default-definition title="Permanent link">&para;</a></h2> <p>The default value is detected based on the preprocessor macro <code class=highlight><span class=n>_HAS_STATIC_RTTI</span><span class=w></span></code>.</p> <p>When the macro is not defined, the library will define it to its default value.</p> <h2 id=examples>Examples<a class=headerlink href=#examples title="Permanent link">&para;</a></h2> <details class=example> <summary>Example</summary> <p>The code below forces the library to enable support for libraries with RTTI dependence:</p> <div class=highlight><pre><span></span><code><span class=cp>#define JSON_HAS_STATIC_RTTI 1</span>
<span class=cp>#include</span><span class=w> </span><span class=cpf>&lt;nlohmann/json.hpp&gt;</span><span class=cp></span>
<span class=p>...</span><span class=w></span>
</code></pre></div> </details> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">&para;</a></h2> <ul> <li>Added in version ?.</li> </ul> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">September 24, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# 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 8v12Z"/></svg> Back to top </a> </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 &copy; 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</code></pre></div> <p>This operator implements a user-defined string literal for JSON objects. It can be used by adding <code class=highlight><span class=n>_json</span><span class=w></span></code> to a string literal and returns a <a href=../json/ ><code>json</code></a> object if no parse error occurred.</p> <p>It is recommended to bring the operator into scope using any of the following lines: <div class=highlight><pre><span></span><code><span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>literals</span><span class=o>::</span><span class=k>operator</span><span class=w> </span><span class=s>&quot;&quot;</span><span class=w> </span><span class=n>_json</span><span class=p>;</span><span class=w></span>
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</code></pre></div> <p>This operator implements a user-defined string literal for JSON objects. It can be used by adding <code class=highlight><span class=n>_json</span><span class=w></span></code> to a string literal and returns a <a href=../json/ ><code>json</code></a> object if no parse error occurred.</p> <p>It is recommended to bring the operator into scope using any of the following lines: <div class=highlight><pre><span></span><code><span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>literals</span><span class=o>::</span><span class=k>operator</span><span class=w> </span><span class=s>&quot;&quot;</span><span class=n>_json</span><span class=p>;</span><span class=w></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=w></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>json_literals</span><span class=p>;</span><span class=w></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=o>::</span><span class=nn>json_literals</span><span class=p>;</span><span class=w></span>
@@ -21,4 +21,4 @@
<span class=w> </span><span class=nt>&quot;answer&quot;</span><span class=p>:</span><span class=w> </span><span class=mi>42</span><span class=p>,</span><span class=w></span>
<span class=w> </span><span class=nt>&quot;hello&quot;</span><span class=p>:</span><span class=w> </span><span class=s2>&quot;world&quot;</span><span class=w></span>
<span class=p>}</span><span class=w></span>
</code></pre></div> </details> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">&para;</a></h2> <ul> <li>Added in version 1.0.0.</li> <li>Moved to namespace <code>nlohmann::literals::json_literals</code> in 3.11.0.</li> </ul> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">August 5, 2022</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# 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 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../operator_gtgt/ class="md-footer__link md-footer__link--prev" aria-label="Previous: operator>>(basic_json)" rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> operator>>(basic_json) </div> </div> </a> <a href=../operator_literal_json_pointer/ class="md-footer__link md-footer__link--next" aria-label='Next: operator""_json_pointer' rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> operator""_json_pointer </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <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 &copy; 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</code></pre></div> </details> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">&para;</a></h2> <ul> <li>Added in version 1.0.0.</li> <li>Moved to namespace <code>nlohmann::literals::json_literals</code> in 3.11.0.</li> </ul> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">September 23, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# 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 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../operator_gtgt/ class="md-footer__link md-footer__link--prev" aria-label="Previous: operator>>(basic_json)" rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> operator>>(basic_json) </div> </div> </a> <a href=../operator_literal_json_pointer/ class="md-footer__link md-footer__link--next" aria-label='Next: operator""_json_pointer' rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> operator""_json_pointer </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <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 &copy; 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@@ -1,5 +1,5 @@
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</code></pre></div> <p>This operator implements a user-defined string literal for JSON Pointers. It can be used by adding <code class=highlight><span class=n>_json_pointer</span><span class=w></span></code> to a string literal and returns a <a href=../json_pointer/ ><code>json_pointer</code></a> object if no parse error occurred.</p> <p>It is recommended to bring the operator into scope using any of the following lines: <div class=highlight><pre><span></span><code><span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>literals</span><span class=o>::</span><span class=k>operator</span><span class=w> </span><span class=s>&quot;&quot;</span><span class=w> </span><span class=n>_json_pointer</span><span class=p>;</span><span class=w></span>
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</code></pre></div> <p>This operator implements a user-defined string literal for JSON Pointers. It can be used by adding <code class=highlight><span class=n>_json_pointer</span><span class=w></span></code> to a string literal and returns a <a href=../json_pointer/ ><code>json_pointer</code></a> object if no parse error occurred.</p> <p>It is recommended to bring the operator into scope using any of the following lines: <div class=highlight><pre><span></span><code><span class=k>using</span><span class=w> </span><span class=n>nlohmann</span><span class=o>::</span><span class=n>literals</span><span class=o>::</span><span class=k>operator</span><span class=w> </span><span class=s>&quot;&quot;</span><span class=n>_json_pointer</span><span class=p>;</span><span class=w></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=w></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>json_literals</span><span class=p>;</span><span class=w></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=o>::</span><span class=nn>json_literals</span><span class=p>;</span><span class=w></span>
@@ -19,4 +19,4 @@
<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>&lt;&lt;</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>2</span><span class=p>)</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=n>val</span><span class=w> </span><span class=o>&lt;&lt;</span><span class=w> </span><span class=sc>&#39;\n&#39;</span><span class=p>;</span><span class=w></span>
<span class=p>}</span><span class=w></span>
</code></pre></div> <p>Output:</p> <div class=highlight><pre><span></span><code><span class=s2>&quot;world&quot;</span><span class=w></span>
</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">&para;</a></h2> <ul> <li><a href=../json_pointer/ >json_pointer</a> - type to represent JSON Pointers</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">&para;</a></h2> <ul> <li>Added in version 2.0.0.</li> <li>Moved to namespace <code>nlohmann::literals::json_literals</code> in 3.11.0.</li> </ul> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">August 5, 2022</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# 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 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../operator_literal_json/ class="md-footer__link md-footer__link--prev" aria-label='Previous: operator""_json' rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> operator""_json </div> </div> </a> <a href=../ordered_json/ class="md-footer__link md-footer__link--next" aria-label="Next: ordered_json" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> ordered_json </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <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 &copy; 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</code></pre></div> </details> <h2 id=see-also>See also<a class=headerlink href=#see-also title="Permanent link">&para;</a></h2> <ul> <li><a href=../json_pointer/ >json_pointer</a> - type to represent JSON Pointers</li> </ul> <h2 id=version-history>Version history<a class=headerlink href=#version-history title="Permanent link">&para;</a></h2> <ul> <li>Added in version 2.0.0.</li> <li>Moved to namespace <code>nlohmann::literals::json_literals</code> in 3.11.0.</li> </ul> <hr> <div class=md-source-file> <small> Last update: <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">September 23, 2023</span> </small> </div> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var tab,labels=set.querySelector(".tabbed-labels");for(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> </div> <a href=# 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 8v12Z"/></svg> Back to top </a> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../operator_literal_json/ class="md-footer__link md-footer__link--prev" aria-label='Previous: operator""_json' rel=prev> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12Z"/></svg> </div> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Previous </span> operator""_json </div> </div> </a> <a href=../ordered_json/ class="md-footer__link md-footer__link--next" aria-label="Next: ordered_json" rel=next> <div class=md-footer__title> <div class=md-ellipsis> <span class=md-footer__direction> Next </span> ordered_json </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4Z"/></svg> </div> </a> </nav> <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 &copy; 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{"config":{"indexing":"full","lang":["en"],"min_search_length":3,"prebuild_index":false,"separator":"[\\s\\-\\.]"},"docs":[{"location":"","text":"JSON for Modern C++ \u00b6","title":"JSON for Modern C++"},{"location":"#json-for-modern-c","text":"","title":"JSON for Modern C++"},{"location":"api/json/","text":"nlohmann:: json \u00b6 using json = basic_json <> ; This type is the default specialization of the basic_json class which uses the standard template types. Examples \u00b6 Example The example below demonstrates how to use the type nlohmann::json . #include <iostream> #include <iomanip> #include <nlohmann/json.hpp> using json = nlohmann :: json ; int main () { // create a JSON object json j = { { \"pi\" , 3.141 }, { \"happy\" , true }, { \"name\" , \"Niels\" }, { \"nothing\" , nullptr }, { \"answer\" , { { \"everything\" , 42 } } }, { \"list\" , { 1 , 0 , 2 }}, { \"object\" , { { \"currency\" , \"USD\" }, { \"value\" , 42.99 } } } }; // add new values j [ \"new\" ][ \"key\" ][ \"value\" ] = { \"another\" , \"list\" }; // count elements auto s = j . size (); j [ \"size\" ] = s ; // pretty print with indent of 4 spaces std :: cout << std :: setw ( 4 ) << j << '\\n' ; } Output: { \"answer\" : { \"everything\" : 42 }, \"happy\" : true , \"list\" : [ 1 , 0 , 2 ], \"name\" : \"Niels\" , \"new\" : { \"key\" : { \"value\" : [ \"another\" , \"list\" ] } }, \"nothing\" : null , \"object\" : { \"currency\" : \"USD\" , \"value\" : 42.99 }, \"pi\" : 3.141 , \"size\" : 8 } Version history \u00b6 Since version 1.0.0.","title":"json"},{"location":"api/json/#nlohmannjson","text":"using json = basic_json <> ; This type is the default specialization of the basic_json class which uses the standard template types.","title":"nlohmann::json"},{"location":"api/json/#examples","text":"Example The example below demonstrates how to use the type nlohmann::json . #include <iostream> #include <iomanip> #include <nlohmann/json.hpp> using json = nlohmann :: json ; int main () { // create a JSON object json j = { { \"pi\" , 3.141 }, { \"happy\" , true }, { \"name\" , \"Niels\" }, { \"nothing\" , nullptr }, { \"answer\" , { { \"everything\" , 42 } } }, { \"list\" , { 1 , 0 , 2 }}, { \"object\" , { { \"currency\" , \"USD\" }, { \"value\" , 42.99 } } } }; // add new values j [ \"new\" ][ \"key\" ][ \"value\" ] = { \"another\" , \"list\" }; // count elements auto s = j . size (); j [ \"size\" ] = s ; // pretty print with indent of 4 spaces std :: cout << std :: setw ( 4 ) << j << '\\n' ; } Output: { \"answer\" : { \"everything\" : 42 }, \"happy\" : true , \"list\" : [ 1 , 0 , 2 ], \"name\" : \"Niels\" , \"new\" : { \"key\" : { \"value\" : [ \"another\" , \"list\" ] } }, \"nothing\" : null , \"object\" : { \"currency\" : \"USD\" , \"value\" : 42.99 }, \"pi\" : 3.141 , \"size\" : 8 }","title":"Examples"},{"location":"api/json/#version-history","text":"Since version 1.0.0.","title":"Version history"},{"location":"api/operator_gtgt/","text":"nlohmann:: operator>>(basic_json) \u00b6 std :: istream & operator >> ( std :: istream & i , basic_json & j ); Deserializes an input stream to a JSON value. Parameters \u00b6 i (in, out) input stream to read a serialized JSON value from j (in, out) JSON value to write the deserialized input to Return value \u00b6 the stream i Exceptions \u00b6 Throws parse_error.101 in case of an unexpected token. Throws parse_error.102 if to_unicode fails or surrogate error. Throws parse_error.103 if to_unicode fails. Complexity \u00b6 Linear in the length of the input. The parser is a predictive LL(1) parser. Notes \u00b6 A UTF-8 byte order mark is silently ignored. Deprecation This function replaces function std :: istream & operator << ( basic_json & j , std :: istream & i ) which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like j << i ; with i >> j ; . Examples \u00b6 Example The example below shows how a JSON value is constructed by reading a serialization from a stream. #include <iostream> #include <iomanip> #include <sstream> #include <nlohmann/json.hpp> using json = nlohmann :: json ; int main () { // create stream with serialized JSON std :: stringstream ss ; ss << R \" ( { \"number\": 23, \"string\": \"Hello, world!\", \"array\": [1, 2, 3, 4, 5], \"boolean\": false, \"null\": null } ) \" ; // create JSON value and read the serialization from the stream json j ; ss >> j ; // serialize JSON std :: cout << std :: setw ( 2 ) << j << '\\n' ; } Output: { \"array\" : [ 1 , 2 , 3 , 4 , 5 ], \"boolean\" : false , \"null\" : null , \"number\" : 23 , \"string\" : \"Hello, world!\" } See also \u00b6 accept - check if the input is valid JSON parse - deserialize from a compatible input Version history \u00b6 Added in version 1.0.0. Deprecated in version 3.0.0.","title":"operator>>(basic_json)"},{"location":"api/operator_gtgt/#nlohmannoperatorbasic_json","text":"std :: istream & operator >> ( std :: istream & i , basic_json & j ); Deserializes an input stream to a JSON valueLine truncated
{"config":{"indexing":"full","lang":["en"],"min_search_length":3,"prebuild_index":false,"separator":"[\\s\\-\\.]"},"docs":[{"location":"","text":"JSON for Modern C++ \u00b6","title":"JSON for Modern C++"},{"location":"#json-for-modern-c","text":"","title":"JSON for Modern C++"},{"location":"api/json/","text":"nlohmann:: json \u00b6 using json = basic_json <> ; This type is the default specialization of the basic_json class which uses the standard template types. Examples \u00b6 Example The example below demonstrates how to use the type nlohmann::json . #include <iostream> #include <iomanip> #include <nlohmann/json.hpp> using json = nlohmann :: json ; int main () { // create a JSON object json j = { { \"pi\" , 3.141 }, { \"happy\" , true }, { \"name\" , \"Niels\" }, { \"nothing\" , nullptr }, { \"answer\" , { { \"everything\" , 42 } } }, { \"list\" , { 1 , 0 , 2 }}, { \"object\" , { { \"currency\" , \"USD\" }, { \"value\" , 42.99 } } } }; // add new values j [ \"new\" ][ \"key\" ][ \"value\" ] = { \"another\" , \"list\" }; // count elements auto s = j . size (); j [ \"size\" ] = s ; // pretty print with indent of 4 spaces std :: cout << std :: setw ( 4 ) << j << '\\n' ; } Output: { \"answer\" : { \"everything\" : 42 }, \"happy\" : true , \"list\" : [ 1 , 0 , 2 ], \"name\" : \"Niels\" , \"new\" : { \"key\" : { \"value\" : [ \"another\" , \"list\" ] } }, \"nothing\" : null , \"object\" : { \"currency\" : \"USD\" , \"value\" : 42.99 }, \"pi\" : 3.141 , \"size\" : 8 } Version history \u00b6 Since version 1.0.0.","title":"json"},{"location":"api/json/#nlohmannjson","text":"using json = basic_json <> ; This type is the default specialization of the basic_json class which uses the standard template types.","title":"nlohmann::json"},{"location":"api/json/#examples","text":"Example The example below demonstrates how to use the type nlohmann::json . #include <iostream> #include <iomanip> #include <nlohmann/json.hpp> using json = nlohmann :: json ; int main () { // create a JSON object json j = { { \"pi\" , 3.141 }, { \"happy\" , true }, { \"name\" , \"Niels\" }, { \"nothing\" , nullptr }, { \"answer\" , { { \"everything\" , 42 } } }, { \"list\" , { 1 , 0 , 2 }}, { \"object\" , { { \"currency\" , \"USD\" }, { \"value\" , 42.99 } } } }; // add new values j [ \"new\" ][ \"key\" ][ \"value\" ] = { \"another\" , \"list\" }; // count elements auto s = j . size (); j [ \"size\" ] = s ; // pretty print with indent of 4 spaces std :: cout << std :: setw ( 4 ) << j << '\\n' ; } Output: { \"answer\" : { \"everything\" : 42 }, \"happy\" : true , \"list\" : [ 1 , 0 , 2 ], \"name\" : \"Niels\" , \"new\" : { \"key\" : { \"value\" : [ \"another\" , \"list\" ] } }, \"nothing\" : null , \"object\" : { \"currency\" : \"USD\" , \"value\" : 42.99 }, \"pi\" : 3.141 , \"size\" : 8 }","title":"Examples"},{"location":"api/json/#version-history","text":"Since version 1.0.0.","title":"Version history"},{"location":"api/operator_gtgt/","text":"nlohmann:: operator>>(basic_json) \u00b6 std :: istream & operator >> ( std :: istream & i , basic_json & j ); Deserializes an input stream to a JSON value. Parameters \u00b6 i (in, out) input stream to read a serialized JSON value from j (in, out) JSON value to write the deserialized input to Return value \u00b6 the stream i Exceptions \u00b6 Throws parse_error.101 in case of an unexpected token. Throws parse_error.102 if to_unicode fails or surrogate error. Throws parse_error.103 if to_unicode fails. Complexity \u00b6 Linear in the length of the input. The parser is a predictive LL(1) parser. Notes \u00b6 A UTF-8 byte order mark is silently ignored. Deprecation This function replaces function std :: istream & operator << ( basic_json & j , std :: istream & i ) which has been deprecated in version 3.0.0. It will be removed in version 4.0.0. Please replace calls like j << i ; with i >> j ; . Examples \u00b6 Example The example below shows how a JSON value is constructed by reading a serialization from a stream. #include <iostream> #include <iomanip> #include <sstream> #include <nlohmann/json.hpp> using json = nlohmann :: json ; int main () { // create stream with serialized JSON std :: stringstream ss ; ss << R \" ( { \"number\": 23, \"string\": \"Hello, world!\", \"array\": [1, 2, 3, 4, 5], \"boolean\": false, \"null\": null } ) \" ; // create JSON value and read the serialization from the stream json j ; ss >> j ; // serialize JSON std :: cout << std :: setw ( 2 ) << j << '\\n' ; } Output: { \"array\" : [ 1 , 2 , 3 , 4 , 5 ], \"boolean\" : false , \"null\" : null , \"number\" : 23 , \"string\" : \"Hello, world!\" } See also \u00b6 accept - check if the input is valid JSON parse - deserialize from a compatible input Version history \u00b6 Added in version 1.0.0. Deprecated in version 3.0.0.","title":"operator>>(basic_json)"},{"location":"api/operator_gtgt/#nlohmannoperatorbasic_json","text":"std :: istream & operator >> ( std :: istream & i , basic_json & j ); Deserializes an input stream to a JSON valueLine truncated
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