Are vector pointers affected by resize()?

[ausairman]

Say I have a pointer to a vector:

vector<int> * p;
vector<int> myvec;
p = &myvec;

And I now resize my vector:

myvec.resize(50); // cause reallocation of memory

my vector has now moved elsewhere in memory right? So is the pointer p still valid? I now that iterators become invalid, but what about pointers to the vector itself? If not, why? Hasn't the vector moved in memory?

[shacktar]

my vector has now moved elsewhere in memory right?

The vector itself hasn't. Its underlying array, starting at &myVec[0], could potentially move if the resize cannot get a contiguous chunk of memory at its current location.

So is the pointer p still valid?

&myVec is still valid; &myVec[0] may have changed.

but what about pointers to the vector itself? If not, why? Hasn't the vector moved in memory?

These questions were answered above.

[ausairman]

Great, thanks for this; I know it's simple but I couldn't find that anywhere.

[ne555]

Can't touch this

[shacktar]

ne555 wrote:

Can't touch this

Obligatory link: http://www.youtube.com/watch?v=otCpCn0l4Wo&ob=av3e