Re: Marshalling deques
Ebenezer wrote:
On Aug 17, 12:32 pm, Victor Bazarov <v.baza...@comcast.invalid>
wrote:
On 8/17/2011 12:28 PM, Ebenezer wrote:
On Aug 17, 5:23 am, "Bo Persson"<b...@gmb.dk> wrote:
Ebenezer wrote:
When you have a vector of a primitive type, rather than
iterating through each element, you can marshal the vector
with the address of the first element and multiply the size
of the vector with the size of each element like this:
buf.Receive(&*vec.begin(), vec.size() * sizeof(T));
I'd like to do something similar with deques, but they are
implemented in chunks rather than a single chunk. How
to get the address and size of each chunk, though? Tia.
http://www.gotw.ca/gotw/054.htm
You cannot.
Deque has to use a two level addressing, probably involving an
array of pointers to the chunks, but the details are not
specified by the standard. There is no interface to this
internal structure.
In that case, how about changing the standard? I believe iterating
through a deque is more involved than iterating through a vector.
So?
It seems that being able to bypass the relatively slower deque
iterators would be helpful.
What I need to know from a deque is what is the first element
of each of it's chunks. Say for example, a deque has 3 chunks
and 500 elements. The interface would give me indices something
like: 0, 200, 400. The indices could be served up in a vector
so I don't have to deal with deque iteration.
There are additional bookkeping involved because the first and last
chunk may be only partially filled.
Bo Persson
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