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d3e347bd2d
* mkdocs: add string_view examples * mkdocs: reference underlying operators * mkdocs: add operator<=> examples * mkdocs: fix style check issues * mkdocs: tweak BJData page * mkdocs: add CMake option hints to macros * mkdocs: fix JSON_DISABLE_ENUM_SERIALIZATION definition * mkdocs: fix link to unit-udt.cpp * mkdocs: fix "Arbitrary Type Conversions" title * mkdocs: link to api/macros/*.md instead of features/macros.md * mkdocs: document JSON_DisableEnumSerialization CMake option * mkdocs: encode required C++ standard in example files * docset: detect gsed/sed * docset: update index * docset: fix CSS patching * docset: add list_missing_pages make target * docset: add list_removed_paths make target * docset: replace page titles with name from index * docset: add install target for Zeal docset browser * Use GCC_TOOL in ci_test_documentation target
35 lines
734 B
C++
35 lines
734 B
C++
#include <iostream>
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#include <iomanip>
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#include <string_view>
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#include <nlohmann/json.hpp>
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using namespace std::string_view_literals;
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using json = nlohmann::json;
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int main()
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{
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// create a JSON object
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json object =
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{
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{"one", 1}, {"two", 2}, {"three", 2.9}
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};
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// output element with key "two"
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std::cout << object["two"sv] << "\n\n";
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// change element with key "three"
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object["three"sv] = 3;
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// output changed array
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std::cout << std::setw(4) << object << "\n\n";
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// mention nonexisting key
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object["four"sv];
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// write to nonexisting key
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object["five"sv]["really"sv]["nested"sv] = true;
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// output changed object
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std::cout << std::setw(4) << object << '\n';
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}
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