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Akamai Interview Question for Applications Developers


Country: India



Comment hidden because of low score. Click to expand.
2
of 2 vote

There are three ways to address this that I know of:

1. boost::any (and the subsequent API that goes with it)
2. void* (that can point to any type of object)
3. Create a generic base class that all of your different types inherit from, then you can create lists and arrays of the parent type for any of the children.

Be mindful with void* as it is not as type-safe as using boost::any.

The drawback to the parent class is that it can overlap and violate the paradigm of modular programming if the items are from items of vastly different types and hierarchies.

You will need to search for the boost api to get all of the details.

- masterjaso July 04, 2013 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

I prefer use boost::variant in most cases. You can read about boost any vs variant differences in boost online doc (unfortunately this site does not allow links)

- michael@videlgauz.com July 06, 2013 | Flag
Comment hidden because of low score. Click to expand.
2
of 2 vote

Union type.

- alpha July 04, 2013 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

Approach 2 is not safe to use. Even how do you define the pop()? You can't simply return void*.

Approach 3 will not work for primitive type.

Can you please how you define pop() in approach 1?

- Hello world July 04, 2013 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 votes

Approach 3 will not work for primitive types, thus you can use method 1 or 2. #1 is the preferred method in my opinion.

To pull a value out of a void*, you are required to know what is going to come out as it is being used, thus the danger or utilizing it.

To pop from method 1, you would use value = boost::any_cast<T>(list) to return a value from the desired container.

- masterjaso July 04, 2013 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 votes

Create wrapper classes for primitives and thus you can get approach 3 work for primitives as well :)
e.g. A wrapper for integer:

class Integer{
public:
	int value;
	Integer(){
		value = 0;
	}
	Integer(int x){
		value = x;
	}
};

- EOF July 05, 2013 | Flag
Comment hidden because of low score. Click to expand.
0
of 0 vote

struct listval
{
int type; // 1 for char,2 for int,3 for double,4 for string
void *p;
}

std::list<struct listval> cont;





map<int,void *>

- Raj July 05, 2013 | Flag Reply


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