C++, ignore exception and continue code?

Question

Is there a way allow execution of a bad block of code after an exception of thrown?

Presently, my code has an while loop that runs continuously. The code inside this while loop sometimes throws a vector out of range error. I have been unable to track down the cause of this particular exception, but ultimately, it doesn't matter much because the code inside the while loop does the same thing over and over again and the next iteration does not depend on the previous iteration in any way.

This, after the code within the while loop crashes, I would like it to start again from the top of the while statement.

Is there a way to accomplish this in C++? try/catch doesn't seem to work in this situation.

Additional Info: I would love to just take the code within the while loop, make it into its own executable, and put the while loop into a bash script, but there's some data each iteration requires that remains static and it takes too much time to re-load that data each time so I am forced to do my infinite while loop within C++

catch the exception in the scope of the loop and continue from there. But, really you NEED to find the root cause of your problem. — Chad
– Chad, Commented Oct 4, 2011 at 20:39
Can you please post some code to look at?. try{}catch(){} should be standard if you want a robust app — user710502
– user710502, Commented Oct 4, 2011 at 20:40
Exceptions are exceptional and should be handled. Even if you can't track down the problem. — Griwes
– Griwes, Commented Oct 4, 2011 at 20:41
Sounds like you want On Error Resume Next for C++. I cannot recommend it. — driis
– driis, Commented Oct 4, 2011 at 20:41
Can you show us how you tried to use the try/catch ? Because I think wrapping the whole code inside the while loop in a try block (and don't forget to document in the code why you don't care about this exception !) should achieve the desired effect. — Jonathan Merlet
– Jonathan Merlet, Commented Oct 4, 2011 at 20:43

mimi · Accepted Answer · 2017-07-28 00:14:45Z

12

You just need to catch the exception inside the while loop:

while(true) 
{
    try 
    {
          // your code
    }
    catch (Exception e) { /* Please, at least do some logging or other error handling here*/ }
}

edited Jul 28, 2017 at 0:14

mimi

5010 bronze badges

answered Oct 4, 2011 at 20:39

driis

165k46 gold badges272 silver badges345 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Mooing Duck Over a year ago

} catch (std::out_of_range& exc) { std::cerr << exc.what(); }

K-ballo Over a year ago

Missing the exception type in that catch. I'd suggest catch(...) since his motivation for catch is not good design.

HelloGoodbye Over a year ago

Is this even valid syntax? I get error: expected ‘(’ before ‘{’ token when I try a try catch statement without any parenthesis after catch.

David Rodríguez - dribeas · Accepted Answer · 2011-10-04 20:43:11Z

1

The first thing that you should do is debug the code, for that you can probably run the code inside a debugger and diagnose what the problem is. Pushing the problem under the rug will not make it go away, and the program will still be buggy.

If on the other hand, the issue is with something that is truly exceptional but feasible (consider opening a file, sending a packet over the network, anything that could potentially fail, but is not expected to --as compared to something that should never happen), the try/catch approach should work.

answered Oct 4, 2011 at 20:43

David Rodríguez - dribeas

209k23 gold badges304 silver badges497 bronze badges

Comments

Code Monkey · Accepted Answer · 2011-10-04 20:49:04Z

0

if you could possibly post a snippet of code, we all could help you more. but in general you should always have some sort of error handling whether it be a try{}catch{} or just checking a variable like:

while(true)
{

if(flag == "Error")
{
//error handle
}

else
{
//continue with code execution
}

}

hope you get this problem solved!

answered Oct 4, 2011 at 20:49

Code Monkey

3191 silver badge7 bronze badges

Collectives™ on Stack Overflow

C++, ignore exception and continue code?

3 Answers 3

3 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

3 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related