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* 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
33 lines
889 B
C++
33 lines
889 B
C++
#include <iostream>
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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 with different entry types
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json j =
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{
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{"integer", 1},
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{"floating", 42.23},
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{"string", "hello world"},
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{"boolean", true},
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{"object", {{"key1", 1}, {"key2", 2}}},
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{"array", {1, 2, 3}}
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};
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// access existing values
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int v_integer = j.value("integer"sv, 0);
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double v_floating = j.value("floating"sv, 47.11);
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// access nonexisting values and rely on default value
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std::string v_string = j.value("nonexisting"sv, "oops");
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bool v_boolean = j.value("nonexisting"sv, false);
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// output values
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std::cout << std::boolalpha << v_integer << " " << v_floating
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<< " " << v_string << " " << v_boolean << "\n";
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}
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