Contiguous allocation of objects using STL vector

Question

I need to create objects dynamically and would like to use vectors to do that. I understand that the pointers to the objects would be stored in the vector and they would be contiguous but the actual object will not be. I can do it as given in Create objects in pre-allocated memory . However, I would prefer to use vectors. Is there any way I could do so?

Exact same thing. Just remember not to change the vector's size, because the memory is reallocated and it will cause all the pointers to those objects to invalidate. — Yochai Timmer
– Yochai Timmer, Commented Oct 4, 2013 at 22:23
Store objects instead of pointers in your vector and they are guaranteed to be contiguous. — goji
– goji, Commented Oct 4, 2013 at 22:24
If you use vector<T> instead of vector<T*> the objects will be laid out contiguously in memory. — Praetorian
– Praetorian, Commented Oct 4, 2013 at 22:24

LihO · Accepted Answer · 2013-10-04 22:25:46Z

"I need to create objects dynamically"

Are you REALLY sure you NEED the dynamic allocation? If it is possible, use vector of objects instead:

std::vector<T> myObjects(100);

this allocates the single block of memory big enough to hold 100 instances of T and initializes them using the default constructor.

@Troy: Yet I believe that this is not the case. But I rephrased my answer :)

Iuri Covalisin · Accepted Answer · 2013-10-04 22:50:56Z

Use custom allocator while creating the vector. Your allocator can pre-allocate memory the way you need it.

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