How do you define a queue overflow exception in c++?

Question

This is the method. Deﬁne a queue overﬂow exception and modify enqueue so that it throws this exception when the queue runs out of space.

this is my code:

void IntQueue::enqueue(int num)
{

    if (isFull())
        cout << "The queue is full.\n";
    else
    {
        // Calculate the new rear position
        rear = (rear + 1) % queueSize;
        // Insert new item
        queueArray[rear] = num;
        // Update item count
        numItems++;
    }
}

how can i insert an exception message here?

`insert an exception message` and `define a queue overflow exception ..` do not mean the same thing — john, Feb 20 '21 at 08:04

score 0 · Answer 1 · answered Feb 20 '21 at 08:00

0

You should replace the call to cout << by a

throw std::runtime_error("queue full");

answered Feb 20 '21 at 08:00

hivert

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thank you for this. But how can you catch the overflow if they occur? – junkyu kim Feb 20 '21 at 08:17

score 0 · Answer 2 · answered Feb 20 '21 at 08:07

Assuming that you are required to define your own exception type then something like the following

#include <stdexcept>

struct QueueException : public std::runtime_error
{
    QueueException(const char* msg) : std::runtime_error(msg) {}
};

void IntQueue::enqueue(int num)
{
    if (isFull())
        throw QueueException("queue full");
    else
        ...
}

If you don't want to define your own exception type then just throw a std::runtime_error as hivert showed.

How do you define a queue overflow exception in c++?

2 Answers2