44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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using namespace nlohmann::literals;
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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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std::cout << std::boolalpha
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<< j.contains("/number"_json_pointer) << '\n'
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<< j.contains("/string"_json_pointer) << '\n'
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<< j.contains("/array"_json_pointer) << '\n'
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<< j.contains("/array/1"_json_pointer) << '\n'
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<< j.contains("/array/-"_json_pointer) << '\n'
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<< j.contains("/array/4"_json_pointer) << '\n'
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<< j.contains("/baz"_json_pointer) << std::endl;
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try
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{
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// try to use an array index with leading '0'
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j.contains("/array/01"_json_pointer);
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}
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catch (json::parse_error& e)
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{
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std::cout << e.what() << '\n';
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}
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try
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{
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// try to use an array index that is not a number
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j.contains("/array/one"_json_pointer);
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}
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catch (json::parse_error& 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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