[Edit] I didn't read the other replies careful enough and managed to repeat a lot of information except how to change the deleter!

[Edit] Actually I removed my answer completely because it is wrong to change the deleter. std::unique_ptr<int[]> selects the corret deleter already. Listen to Edd!

std::vector is used to manage vectors. std::unique_ptr is used to manage pointers to objects or vectors.

The wording is a bit confusing but I think I understand. Avoid writing this:

std::unique_ptr<int> x(new int[1000]);

because

• The memory will be deleted with delete instead of delete []
• It is weird to index the array like this: x.get()[index]
• The unique_ptr don't know the size of the array
• The array can't grow

I think the delete issue is the most important but if you really have to it is possible to change the deleter of the unique_ptr:

std::unique_ptr<int, std::default_delete<int[]> x(new int[1000]);

But you should really use std::vector instead because it works like a container and not a pointer.

[Edit] I didn't read the other replies careful enough and managed to repeat a lot of information except how to change the deleter!

std::vector is used to manage vectors. std::unique_ptr is used to manage pointers to objects or vectors.

The wording is a bit confusing but I think I understand. Avoid writing this:

std::unique_ptr<int> x(new int[1000]);

because

• The memory will be deleted with delete instead of delete []
• It is weird to index the array like this: x.get()[index]
• The unique_ptr don't know the size of the array
• The array can't grow

I think the delete issue is the most important but if you really have to it is possible to change the deleter of the unique_ptr:

std::unique_ptr<int, std::default_delete<int[]> x(new int[1000]);

But you should really use std::vector instead because it works like a container and not a pointer.