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

   1 #include <iostream>
   2 #include <nlohmann/json.hpp>
   3
   4 using json = nlohmann::json;
   5
   6 int main()
   7 {
   8     // create JSON values
   9     json j_null;
  10     json j_boolean = true;
  11     json j_number_integer = -17;
  12     json j_number_unsigned = 42u;
  13     json j_number_float = 23.42;
  14     json j_object = {{"one", 1}, {"two", 2}};
  15     json j_array = {1, 2, 4, 8, 16};
  16     json j_string = "Hello, world";
  17
  18     // call operator value_t()
  19     json::value_t t_null = j_null;
  20     json::value_t t_boolean = j_boolean;
  21     json::value_t t_number_integer = j_number_integer;
  22     json::value_t t_number_unsigned = j_number_unsigned;
  23     json::value_t t_number_float = j_number_float;
  24     json::value_t t_object = j_object;
  25     json::value_t t_array = j_array;
  26     json::value_t t_string = j_string;
  27
  28     // print types
  29     std::cout << std::boolalpha;
  30     std::cout << (t_null == json::value_t::null) << '\n';
  31     std::cout << (t_boolean == json::value_t::boolean) << '\n';
  32     std::cout << (t_number_integer == json::value_t::number_integer) << '\n';
  33     std::cout << (t_number_unsigned == json::value_t::number_unsigned) << '\n';
  34     std::cout << (t_number_float == json::value_t::number_float) << '\n';
  35     std::cout << (t_object == json::value_t::object) << '\n';
  36     std::cout << (t_array == json::value_t::array) << '\n';
  37     std::cout << (t_string == json::value_t::string) << '\n';
  38 }