ancwrd1 / cjsonpp

Type-safe thin C++ wrapper over cJSON library (header-only). Version 0.4

When compiled with recent gcc compiler with c++11 support the following features are enabled:

• initializer list for array object construction
• default template parameters for constructor, get<> and asArray<> functions
• std::shared_ptr

if C++11 support is not compiled the std::tr1::shared_ptr implementation is used. Feel free to replace it with boost::shared_ptr if needed (see below _SHARED_PTR_IMPL macro)

Usage examples:

// parse and get value
JSONObject obj = cjsonpp::parse(jsonstr);

// JSONObject can be copied over

// get value of the named element
try {
	std::cout << obj.get<int>("intval") << std::endl;
	std::cout << obj.get<JSONObject>("intval").as<int>() << std::endl;
} catch (const JSONError& e) {
	std::cerr << e.what() << '\n';
}

// get array
std::vector<double> arr1 = obj.get("elems").asArray<double>();
std::list<std::string> arr2 = obj.get("strs").asArray<std::string, std::list>();

...
// construct object
JSONObject obj;
std::vector<int> v = {1, 2, 3, 4}; // c++11 only
obj.set("intval", 1234);
obj.set("arrval", v);
obj.set("doubleval", 100.1);
obj.set("nullval", cjsonpp::nullObject());

...
// another way of constructing array
JSONObject arr = cjsonpp::arrayObject();
arr.add("s1");
arr.add("s2");
JSONObject obj;
obj.set("arrval", arr);
std::cout << obj << std::endl;

The following data types are supported with get<>("name") and as<>() functions:

• int
• int64_t
• double
• std::string
• bool
• JSONObject

To add support for more data types add a template specialization for private static function as<>(cJSON*). Example:

// Qt support
QString JSONObject::as<QString>(cJSON* obj)
{
	return QString::fromStdString(as<std::string>(obj));
}