#include#include int main() { // Construct a JSON object Json::Value obj; obj["name"] = "John"; obj["age"] = 30; // Check if a key exists if (obj.isMember("name")) { std::cout << "There is a 'name' field in the JSON object." << std::endl; } return 0; }
#includeThis example also creates a JSON object, but it checks if the key "email" exists using `isMember()`. Since "email" does not exist, the program does nothing. Based on the inclusion of `#includeint main() { // Construct a JSON object Json::Value obj; obj["name"] = "John"; obj["age"] = 30; // Check if a non-existent key exists if (obj.isMember("email")) { // This code will not be executed } return 0; }