Vladimir Prus <ghost@cs.msu.su> writes:
Its very easy to write for(...{ X x = *it; // create a copy of ar << x }
all the x's are at the same address so if they happen to be tracked because a pointer to some X in serialized somewhere in the program, then the subsequent copies would be supprsed by tracking.
What does "the subsequence copies would be supressed by tracking"? Are you saing that only one 'X' will be stored in archive?
Yes, if (as is highly likely) the x happens to have the same address in each iteration of the loop. To reconstruct object graphs correctly (that's what tracking is for), you need to do it that way.
And what will happen duing deserialization. Will you load just one 'X' object, and then for each iteration of deserialization loop, make a copy of it?
Surely it depends what the deserialization loop looks like, but the serialization library itself won't make any copies: it will return a reference or pointer to that same object each time. -- Dave Abrahams Boost Consulting www.boost-consulting.com