The boost assignment is really nice, but what about the other direction (from vector to scalars)? This comes up quite often.

ublas::vector<double> f()

{

ublas::vector<double> v(2);

v(0) = 1.1;

v(1) = 2.1;

return v;

}

double x;

double y;

ublas::vector<double> v(2);

v(0) = 1.1;

v(1) = 2.1;

ublas::tie(x, y) = v;

ublas::tie(x, y) = f(); //With function

ublas::matrix<double> mat(2,2); //....

ublas::tie(x, y) = row(mat, 0);

ublas::vector<int> v2(2);

v2(0) = 1;

v2(1) = 2;

int z;

ublas::tie(x, z); //With different types

For vector expressions, this seems to be easy enough to do. See the attached basic implementation for 2 parameters. With a little boost preprocessor, this could be fairly general. What do people think? Are there any boost PP who could generalize this?

-Jesse