Standard shrinkable arrays
Arrays created by the
new operator should be shirnkable by the
//a contains only 10 ints
Example initialize undefined size arrays
Sometimes it is not possible to know the size of an array before allocating it.
If the programmer wants to avoid the waste of memory using non-shrinkable arrays, it would be required to create a new array with the correct size and delete the old array after copying its elements.
Note that it is also possible to use other implementations, such as linked lists or some others that allow dynamic size.
On cases where the arrays have a defined maximum size, its elements must be sequentially aligned and its real size is unknown before the allocation, it would be useful to have shrinkable arrays.
Example free data as soon it becomes useless
In some cases, when a program ends to compute some data, it becomes useless and to free it, could allow other applications to use their memory blocks.
In case of NP-complete optimization problems one may require more memory for finding non-optimal solutions and a lot of time for finding the optimal solution.
With shrinkable arrays the ability of freeing the unused allocated memory could enable its usage for other purposes.
//computation time 1 month