class MyVal
{
    int val;
    // when added next line, the gdb print work correctly when dimension >= 4
    // int dummy[4];
  public:
    MyVal() { val = 42; }
    MyVal(int _val) { val = _val; }
    // when remove the next copy ctor, the gdb print work correctly
    MyVal(const MyVal& other) { val = other.val; }
};

class MyClassBase
{
  public:
    virtual MyVal getMyVal() = 0;
};

class MyClass : public MyClassBase
{
    MyVal myVal;
  public:
    virtual MyVal getMyVal() { return myVal; }
};

int main(int argc, const char **argv)
{
    MyClassBase *myClass = new MyClass();
    MyVal m;
    m = myClass->getMyVal();
    m = myClass->getMyVal();
}