45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#include <json.hpp>
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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 value
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json j =
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{
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{"number", 1}, {"string", "foo"}, {"array", {1, 2}}
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};
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// read-only access
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// output element with JSON pointer "/number"
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std::cout << j.at("/number"_json_pointer) << '\n';
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// output element with JSON pointer "/string"
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std::cout << j.at("/string"_json_pointer) << '\n';
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// output element with JSON pointer "/array"
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std::cout << j.at("/array"_json_pointer) << '\n';
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// output element with JSON pointer "/array/1"
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std::cout << j.at("/array/1"_json_pointer) << '\n';
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// writing access
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// change the string
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j.at("/string"_json_pointer) = "bar";
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// output the changed string
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std::cout << j["string"] << '\n';
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// change an array element
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j.at("/array/1"_json_pointer) = 21;
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// output the changed array
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std::cout << j["array"] << '\n';
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// try to use an invalid JSON pointer
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try
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{
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auto ref = j.at("/number/foo"_json_pointer);
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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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