"J.M." <jm_jm@gmx.de> wrote in message
news:esoj3j$v9i$1@news2.rz.uni-karlsruhe.de...
I am trying to use a software package in my program, the problem being
different methods are used to store vectors. I have "my" vectors stored
as vector<double> from the STL and need to pass a double* and the
dimension of
the vector to the software package. On return, I get a double* plus
dimension, but need vector<double>. Is there anyway that this can be
achieved *without* copying the data, as this is a very expensive option?
Thanks in advance for any help.
Jan
Going into the functions, yes. Vectors are guaranteed to store their
data
contiguously and so can be used where arrays are expected. That is, you
can
pass &MyVector[0] and MyVector.size(). &MyVector.front() is also used
sometimes.
Coming out of the functions, I don't see how. You are given a pointer to
an
array of doubles. The only way to get this into a vector, as far as I
know,
is to copy the data. There may be some constructor for vector that takes
a pointer to data and a length, I just don't know (but tend to doubt
it?).
Thanks, but that is precisely what I needed :-). Actually, the software
vector<double>... I just hope I am not doing something dangerous...