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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
51 lines
1.1 KiB
C++
51 lines
1.1 KiB
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 JSON object
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json object =
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{
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{"the good", "il buono"},
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{"the bad", "il cattivo"},
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{"the ugly", "il brutto"}
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};
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// output element with key "the ugly" using string_view
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std::cout << object.at("the ugly"sv) << '\n';
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// change element with key "the bad" using string_view
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object.at("the bad"sv) = "il cattivo";
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// output changed array
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std::cout << object << '\n';
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// exception type_error.304
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try
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{
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// use at() with string_view on a non-object type
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json str = "I am a string";
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str.at("the good"sv) = "Another string";
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}
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catch (json::type_error& e)
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{
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std::cout << e.what() << '\n';
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}
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// exception out_of_range.401
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try
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{
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// try to write at a nonexisting key using string_view
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object.at("the fast"sv) = "il rapido";
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}
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catch (json::out_of_range& e)
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{
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std::cout << e.what() << '\n';
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}
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}
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