| #include <iostream> |
| #include <nlohmann/json.hpp> |
| |
| using json = nlohmann::json; |
| |
| int main() |
| { |
| // create JSON array |
| const json array = {"first", "2nd", "third", "fourth"}; |
| |
| // output element at index 2 (third element) |
| std::cout << array.at(2) << '\n'; |
| |
| |
| // exception type_error.304 |
| try |
| { |
| // use at() on a non-array type |
| const json str = "I am a string"; |
| std::cout << str.at(0) << '\n'; |
| } |
| catch (json::type_error& e) |
| { |
| std::cout << e.what() << '\n'; |
| } |
| |
| // exception out_of_range.401 |
| try |
| { |
| // try to read beyond the array limit |
| std::cout << array.at(5) << '\n'; |
| } |
| catch (json::out_of_range& e) |
| { |
| std::cout << e.what() << '\n'; |
| } |
| } |