void mergeSortPart (int * A, int p, int r) {
// Сортировка части массива
if (p<r) {
int q=(p+r)/2;
mergeSortPart (A, p, q);
mergeSortPart (A, q+one, r);
merge (A, p, q, r);
}
}
void mergeSortPart(iter_t beg, iter_t end, int size){
if(size <= 1)
return;
iter_t mid = beg;
for(int i = 0; i < size/2 ; ++i){
mid = mid->m_next;
}
// size/2 + (size+1)/2 = size
// store beg's prev in advance, which is unchangable, to get a new beg
iter_t header = beg->m_prev;
mergeSortPart(beg, mid, size/2);
// similiarly
iter_t pre_mid = mid->m_prev;
mergeSortPart(mid, end, (size+1)/2);
// restore
merge(header->m_next, pre_mid->m_next, end);
}
void mergeSort (int * A, int length) {
// Сортировка всего массива методом слияния
mergeSortPart (A, zero, length-one);
}
void mergeSort(iter_t beg, iter_t end, int size, cmp_t compare){
cmp = compare;
mergeSortPart(beg, end, size);
}