/*! make a shallow copy of the vector\n
This function is not desinged to be used in project codes. */
inline void drovector::shallow_copy(const _drovector& vec)
{VERBOSE_REPORT;
l =vec.l;
cap =vec.cap;
delete [] array;
array =vec.array;
vec.nullify();
}
/*! drovector constructor to cast _drovector */
inline drovector::drovector(const _drovector& vec)
{VERBOSE_REPORT;
//////// initialize ////////
l =vec.l;
cap =vec.cap;
array =vec.array;
vec.nullify();
}