Computer Science Canada

scope and freestore

Author:	Geminias [ Sun Nov 13, 2005 9:01 pm ]
Post subject:	scope and freestore
if i make a function and i create a variable on the freestore and a pointer to point to its location, how do i get access to that variables value once the function returns. i'm guess i have to make the pointer public somehow? or how would i do this besides put it into a class and declare it public?

Author:

wtd [ Mon Nov 14, 2005 12:18 am ]

Post subject:

Have the function return the pointer.

c++:

int *foo()
{
return new int(42);
}

int main()
{
int *bar = foo();
}

Author:	Geminias [ Mon Nov 14, 2005 3:06 pm ]
Post subject:
good, the only thing is i'd hate to have to make a function for each pointer i'd like to return, what's the format for returning multiple items? or can you return multiple items? lol eg. return 0; //0 is one item. return 0 << 3 << 5; // if the sytanx were correct it would return 3 items.

Author:

wtd [ Mon Nov 14, 2005 5:42 pm ]

Post subject:

If you dynamically allocate an array, you can return it as a pointer.

c++:

int *foo()
{
int *output = new int[2];
output[0] = 4;
output[1] = 5;
return output;
}

int main()
{
int *bar = foo();
}

Or you could use a std::vector, or a std::pair object.

Other languages make it much easier to return multiple values.

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