void SVSet::deleteVec(DLPSV* ps)
{
/* delete last entries, in an SVECTOR and also in an DLPSV there is always the position -1 used for memorizing
* the size; this is the reason why we need to delete max()+1 entries
*/
if (list.last() == ps)
removeLast(ps->max() + 1);
/* merge space of predecessor with position which will be deleted, therefore we do not need to delete any
* memory or do an expensive memmove
*
* @note an SVECTOR and also in an DLPSV memorize the size always on position -1; this is the reason why we
* need to set the new mem size to the old combined size + 2
*/
else if (list.first() != ps)
{
SVector* prev = ps->prev();
int sz = prev->size();
prev->setMem(prev->max() + ps->max() + 2, prev->mem());
prev->set_size(sz);
}
/* delete the front entries of the first list entry and correct the memory pointers in the vectors */
/* @note we do this by merging the first both vectors, move the entries from the second vector up front, and
* correct the size
*/
else
{
SVector* next = ps->next();
int sz = next->size();
int bothmax = next->max() + ps->max();
int offset = 0;
/* the first element does not need to start at the beginning of the data array; why ??? */
while( &(this->SVSetBase::operator[](offset)) != ps->mem() )
{
++offset;
assert(offset < size());
}
/* move all entries of the second vector to the front */
for(int j = 0; j <= sz; ++j)
{
this->SVSetBase::operator[](offset + j) = next->mem()[j];
}
/* correct the data memmory pointer and the maximal space */
next->setMem(bothmax + 2, ps->mem());
/* correct size */
next->set_size(sz);
}
list.remove(ps);
}
void SVSet::xtend(SVector& svec, int newmax)
{
if (svec.max() < newmax)
{
if (possiblyUnusedMem * memFactor > memSize())
memPack();
assert(has(&svec));
DLPSV* ps = static_cast<DLPSV*>( & svec );
if (ps == list.last())
{
int sz = ps->size();
ensureMem (newmax - ps->max() + 1);
insert(memSize(), newmax - ps->max());
ps->setMem (newmax + 1, ps->mem());
ps->set_size( sz );
}
else
{
ensureMem(newmax + 1);
SVector newps(newmax + 1, &last() + 1);
int sz = ps->size();
insert(memSize(), newmax + 1);
newps = svec;
if (ps != list.first())
{
SVector* prev = ps->prev();
int prevsz = prev->size();
prev->setMem (prev->max()
+ ps->max() + 2, prev->mem());
prev->set_size(prevsz);
possiblyUnusedMem += ps->max();
}
list.remove(ps);
list.append(ps);
ps->setMem(newmax + 1, newps.mem());
ps->set_size(sz);
}
}
}
