jPtr operation does not throw

[olcydvt]

• What is the issue you have?

When I use jptr like below( it is a bad request), I can't catch any throw. Is there any problem on my operation or Is this a bug?

 try
 {
     // try to use the array index '-'
     json::reference ref = j.at("/array"_json_pointer);
 } catch (json::out_of_range& e)
   {
     std::cout << e.what() << '\n';
   } catch (json::out_of_range& e) {
     std::cout << e.what() << '\n';
   }

Thanks a lot

[nickaein]

Can you provide a working sample that this error could be reproduced?

Also, in addition to json::out_of_range, you might try other exception types, or base json::exception or even std::exception types, to see whether some other exception is being thrown.

[olcydvt]

of course,

I will try your suggestion

here is my sample

    nlohmann::json val;
    json::json_pointer jsonPtr("/services/2/serviceName");
    try {
        val =  (std::string)j.at(jsonPtr);
    } catch (json::parse_error& e) {
        val = 0;
    } catch (json::out_of_range& e)
    {
        val = 0;
    }

[nickaein]

There was a typo in the sample code. I've cleaned up a bit:

#include "json.hpp"
#include <iostream>

using namespace std;
using namespace nlohmann;

void check()
{
    nlohmann::json val;

    json::json_pointer jsonPtr("/services/2/serviceName");
    try 
    {
        cout << "Checking..." << endl;
        val =  (std::string)val.at(jsonPtr);
        cout << "no exception." << endl;
    }
    catch (json::parse_error& e) 
    {
        val = 0;
        cout << "thrown parse_error: " << e.what() << endl;
    }
    catch (json::out_of_range& e)
    {
        val = 0;
        cout << "thrown out_of_range: " << e.what() << endl;
    }
    catch (std::exception& e)
    {
        val = 0;
        cout << "thrown unknown exception: " << e.what() << endl;        
    }
}

int main(void)
{
    check();
    cout << "Done." << endl;
    return 0;
}

This outputs

Checking...
thrown out_of_range: [json.exception.out_of_range.404] unresolved reference token 'services'
Done.

which is expected (tested on version 3.6.1).

[olcydvt]

By the way, I try something like that;

what if wrong path was came from like "services" (it should be "services/2/serviceName"). I know it is wrong request but I assume that client side sent it.

json::json_pointer jsonPtr("/services");

Then, I tried to catch it with json::exception and it works.

Thanks a lot.