ceph/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/doc/examples/get_ref.cpp

   1 #include <iostream>
   2 #include <nlohmann/json.hpp>
   3
   4 using json = nlohmann::json;
   5
   6 int main()
   7 {
   8     // create a JSON number
   9     json value = 17;
  10
  11     // explicitly getting references
  12     auto r1 = value.get_ref<const json::number_integer_t&>();
  13     auto r2 = value.get_ref<json::number_integer_t&>();
  14
  15     // print the values
  16     std::cout << r1 << ' ' << r2 << '\n';
  17
  18     // incompatible type throws exception
  19     try
  20     {
  21         auto r3 = value.get_ref<json::number_float_t&>();
  22     }
  23     catch (json::type_error& ex)
  24     {
  25         std::cout << ex.what() << '\n';
  26     }
  27 }