Function begin

Source/external/json.hpp:21936–21941

@brief returns an iterator to the first element @sa https://json.nlohmann.me/api/basic_json/begin/

	/// @brief returns an iterator to the first element
	/// @sa https://json.nlohmann.me/api/basic_json/begin/
	iterator begin() noexcept
	{
		iterator result(this);
		result.set_begin();
		return result;
	}

	/// @brief returns an iterator to the first element
	/// @sa https://json.nlohmann.me/api/basic_json/begin/