c++ - Use std::vector::data after reserve

Question

I have a std::vector on which I call reserve with a large value. Afterwards I retrieve data().

Since iterating data is then crashing I am wondering whether this is even allowed. Is reserve forced to update data to the allocated memory range?

Answer 1

The guarantee of reserve is that subsequent insertions do not reallocate, and thus do not cause invalidation. That's it. There are no further guarantees.