assigning products to traingularView does not warn for size mismatch

Submitted by Jitse Niesen

Assigned to Nobody

Link to original bugzilla bug (#784)
Version: 3.2

Description

Test code:

MatrixXd m1, m2;
m1.setRandom(5,5);
m2.resize(6,6);
m2.triangularView<Lower>() = m1*m1;

This should warn that the size of m2 is different from the size of m1*m1 (unless compiled with -DNDEBUG) but it does not. Instead it produces invalid reads when run under valgrind.

Note that the product is necessary, "m2.triangularView<Lower>() = m1" without the product does produce a warning.