CODEWITHSUNDEEP
c++exceptionqueuetry-catch
user1057004
user1057004

Reputation:

C++ Throwing Exception If Popping Empty Queue

I'm writing an implementation of a priority queue using linked list nodes in C++.

I am new to the language and would really appreciate it if someone could help me figure out how to throw an exception when the pop() function is called on an empty queue.

I have tried using the try and catch exception handling but my code keeps getting a "segmenation fault error"

My priority queue is implemented correctly.. push(), isEmpty(), size(), clear() work. pop() also functions but I want to throw an exception if the user makes an illegal call. 

try {
    if(isEmpty()) {
        throw -1;
    }
}
catch(int n) {
    cout << "ERROR" << n << ": LIST IS EMPTY" << endl;
}

Upvotes: 3

Views: 5503

Answers (2)

goji
goji

Reputation: 7092

Throwing an integer as an exception really isn't the done thing in c++. You really should create either a new exception for the job or pick one of the existing exceptions std library that might fit situation.

http://www.java2s.com/Tutorial/Cpp/0120__Exceptions/Throwyourownexceptionclassbasedonruntimeerror.htm

Yes the domain says java, but it's a c++ tutorial and has an example of how to create a custom exception derived from std::runtime_error.

Upvotes: 1

Pete Becker
Pete Becker

Reputation: 76315

You throw an exception with a throw statement. There's no try or catch involved. It's the responsibility of the caller to catch the exception.

if (isEmpty())
    throw -1;

Upvotes: 1

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