ceph/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/doc/examples/empty.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_float = 23.42;
  13     json j_object = {{"one", 1}, {"two", 2}};
  14     json j_object_empty(json::value_t::object);
  15     json j_array = {1, 2, 4, 8, 16};
  16     json j_array_empty(json::value_t::array);
  17     json j_string = "Hello, world";
  18
  19     // call empty()
  20     std::cout << std::boolalpha;
  21     std::cout << j_null.empty() << '\n';
  22     std::cout << j_boolean.empty() << '\n';
  23     std::cout << j_number_integer.empty() << '\n';
  24     std::cout << j_number_float.empty() << '\n';
  25     std::cout << j_object.empty() << '\n';
  26     std::cout << j_object_empty.empty() << '\n';
  27     std::cout << j_array.empty() << '\n';
  28     std::cout << j_array_empty.empty() << '\n';
  29     std::cout << j_string.empty() << '\n';
  30 }