c++ vectors simple question

[rokuingh]

I've come to a point where I must question everything, maybe you can help...

if

vector<object*> ptr_vec;

is a vector of pointers where all objects of ptr_vec have public member variables:

 mem_var1 = somenumber; 
mem_var2 = somenumber;
 

using:

int i = somenumber; 

as a number less than or equal to the size of the vector, is:

int j = (ptr_vec[i] -> mem_var1) %!@% i;

considered defined behavior for %!@% a standard operation *, /, +, or -?

what about:

ptr_vec[i] -> mem_var1 = ptr_vec[i] ->memvar2 %!@% i;

for the same operations?

[Banfa]

You do not seem to have stated a real problem or an actual question.

I have considered the lines of code you have posted, what would you like me to do next?

[rokuingh]

yeah, sorry, dumb question. I've just been looking into undefined behavior, and I know that pointers in vectors can cause a lot of problems. thanks for your time.