Hi,
I found a regression in GiNaC 1.7.0.
In basic.cpp (function subs_one_level) the lines
588 auto it = m.find(*this);
589 if (it != m.end())
590 return it->second;
591 return *this;
are causing problems. In GiNaC 1.6.7 we have
599 ex thisex = *this;
600 it = m.find(thisex);
601 if (it != m.end())
602 return it->second;
603 return thisex;
which work properly.
The problem with the 1.7.0 version is, that the this-pointer is
dynamically allocated in line 618 (when called from line 629).
*this is implicitly casted into an ex, both in line 588 and in line
591. As the dynallocated-flag is set, the first cast destroys the
this-pointer, and the second cast crashes.
Mario