How to access multiple keys together from a json file

[MdAnayat]

Hello,
First of all thanx for this amazing JSON library.
I have a JSON file called input.json.
The keys and values inside of the input.json file is as follows:
{"values":"init","roi_x":"10","roi_y":"10","roi_w":"10","roi_h":"10","red_min":"100","red_max":"150"}
Now, for accessing each parameter of the input.json file i have used the below code:

std::ifstream ifs("./input.json");
json j = json::parse(ifs);
for (const auto& element : j["roi_x"])
{
	x = std::stoi(element.get_ref<const std::string&>());
	std::cout << "The received x_coordinate value: " << x << std::endl;
}
for (const auto& element : j["roi_y"])
{
	y = std::stoi(element.get_ref<const std::string&>());
	std::cout << "The received y_coordinate value: " << y << std::endl;
}

for (const auto& element : j["roi_w"])
{
	w = std::stoi(element.get_ref<const std::string&>());
	std::cout << "The received width of the ROI: " << w << std::endl;
}

for (const auto& element : j["roi_h"])
{
	h = std::stoi(element.get_ref<const std::string&>());
	std::cout << "The received height of the ROI: " << h << std::endl;
}

for (const auto& element : j["red_min"])
{
	r = std::stoi(element.get_ref<const std::string&>());
	std::cout << "The received minimum Red value: " << r << std::endl;
}

for (const auto& element : j["red_max"])
{
	k = std::stoi(element.get_ref<const std::string&>());
	std::cout << "The received maximum red value: " << k << std::endl;
}

The problem is for accessing each of the parameters of input.json file i need to use for loop.

My question: Is there any way to access all the parameters using the for loop only one time??? I want to refrain myself using for loops so many times.

Any kind of help to solve this issue will be highly appreciated..

Best Regards
Anayat

[nlohmann]

You do not need to loop at all. You can use this:

x = std::stoi(j["roi_x"].get_ref<const std::string&>());
std::cout << "The received x_coordinate value: " << x << std::endl;

y = std::stoi(j["roi_y"].get_ref<const std::string&>());
std::cout << "The received y_coordinate value: " << y << std::endl;

[MdAnayat]

It solved my problem. Thanx a lot for your quick response