?? stl_algo.c
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const int __stl_chunk_size = 7;
template <class _RandomAccessIter, class _Distance>
void __chunk_insertion_sort(_RandomAccessIter __first,
_RandomAccessIter __last, _Distance __chunk_size)
{
while (__last - __first >= __chunk_size) {
__insertion_sort(__first, __first + __chunk_size);
__first += __chunk_size;
}
__insertion_sort(__first, __last);
}
template <class _RandomAccessIter, class _Distance, class _Compare>
void __chunk_insertion_sort(_RandomAccessIter __first,
_RandomAccessIter __last,
_Distance __chunk_size, _Compare __comp)
{
while (__last - __first >= __chunk_size) {
__insertion_sort(__first, __first + __chunk_size, __comp);
__first += __chunk_size;
}
__insertion_sort(__first, __last, __comp);
}
template <class _RandomAccessIter, class _Pointer, class _Distance>
void __merge_sort_with_buffer(_RandomAccessIter __first,
_RandomAccessIter __last,
_Pointer __buffer, _Distance*) {
_Distance __len = __last - __first;
_Pointer __buffer_last = __buffer + __len;
_Distance __step_size = __stl_chunk_size;
__chunk_insertion_sort(__first, __last, __step_size);
while (__step_size < __len) {
__merge_sort_loop(__first, __last, __buffer, __step_size);
__step_size *= 2;
__merge_sort_loop(__buffer, __buffer_last, __first, __step_size);
__step_size *= 2;
}
}
template <class _RandomAccessIter, class _Pointer, class _Distance,
class _Compare>
void __merge_sort_with_buffer(_RandomAccessIter __first,
_RandomAccessIter __last, _Pointer __buffer,
_Distance*, _Compare __comp) {
_Distance __len = __last - __first;
_Pointer __buffer_last = __buffer + __len;
_Distance __step_size = __stl_chunk_size;
__chunk_insertion_sort(__first, __last, __step_size, __comp);
while (__step_size < __len) {
__merge_sort_loop(__first, __last, __buffer, __step_size, __comp);
__step_size *= 2;
__merge_sort_loop(__buffer, __buffer_last, __first, __step_size, __comp);
__step_size *= 2;
}
}
template <class _BidirectionalIter, class _Distance, class _Pointer>
void __merge_adaptive(_BidirectionalIter __first,
_BidirectionalIter __middle,
_BidirectionalIter __last,
_Distance __len1, _Distance __len2,
_Pointer __buffer, _Distance __buffer_size) {
if (__len1 <= __len2 && __len1 <= __buffer_size) {
_Pointer __buffer_end = copy(__first, __middle, __buffer);
merge(__buffer, __buffer_end, __middle, __last, __first);
}
else if (__len2 <= __buffer_size) {
_Pointer __buffer_end = copy(__middle, __last, __buffer);
__merge_backward(__first, __middle, __buffer, __buffer_end, __last);
}
else {
_BidirectionalIter __first_cut = __first;
_BidirectionalIter __second_cut = __middle;
_Distance __len11 = 0;
_Distance __len22 = 0;
if (__len1 > __len2) {
__len11 = __len1 / 2;
advance(__first_cut, __len11);
__second_cut = lower_bound(__middle, __last, *__first_cut);
distance(__middle, __second_cut, __len22);
}
else {
__len22 = __len2 / 2;
advance(__second_cut, __len22);
__first_cut = upper_bound(__first, __middle, *__second_cut);
distance(__first, __first_cut, __len11);
}
_BidirectionalIter __new_middle =
__rotate_adaptive(__first_cut, __middle, __second_cut, __len1 - __len11,
__len22, __buffer, __buffer_size);
__merge_adaptive(__first, __first_cut, __new_middle, __len11,
__len22, __buffer, __buffer_size);
__merge_adaptive(__new_middle, __second_cut, __last, __len1 - __len11,
__len2 - __len22, __buffer, __buffer_size);
}
}
template <class _BidirectionalIter, class _Distance, class _Pointer,
class _Compare>
void __merge_adaptive(_BidirectionalIter __first,
_BidirectionalIter __middle,
_BidirectionalIter __last,
_Distance __len1, _Distance __len2,
_Pointer __buffer, _Distance __buffer_size,
_Compare __comp) {
if (__len1 <= __len2 && __len1 <= __buffer_size) {
_Pointer __buffer_end = copy(__first, __middle, __buffer);
merge(__buffer, __buffer_end, __middle, __last, __first, __comp);
}
else if (__len2 <= __buffer_size) {
_Pointer __buffer_end = copy(__middle, __last, __buffer);
__merge_backward(__first, __middle, __buffer, __buffer_end, __last,
__comp);
}
else {
_BidirectionalIter __first_cut = __first;
_BidirectionalIter __second_cut = __middle;
_Distance __len11 = 0;
_Distance __len22 = 0;
if (__len1 > __len2) {
__len11 = __len1 / 2;
advance(__first_cut, __len11);
__second_cut = lower_bound(__middle, __last, *__first_cut, __comp);
distance(__middle, __second_cut, __len22);
}
else {
__len22 = __len2 / 2;
advance(__second_cut, __len22);
__first_cut = upper_bound(__first, __middle, *__second_cut, __comp);
distance(__first, __first_cut, __len11);
}
_BidirectionalIter __new_middle =
__rotate_adaptive(__first_cut, __middle, __second_cut, __len1 - __len11,
__len22, __buffer, __buffer_size);
__merge_adaptive(__first, __first_cut, __new_middle, __len11,
__len22, __buffer, __buffer_size, __comp);
__merge_adaptive(__new_middle, __second_cut, __last, __len1 - __len11,
__len2 - __len22, __buffer, __buffer_size, __comp);
}
}
template <class _RandomAccessIter, class _Pointer, class _Distance>
void __stable_sort_adaptive(_RandomAccessIter __first,
_RandomAccessIter __last, _Pointer __buffer,
_Distance __buffer_size) {
_Distance __len = (__last - __first + 1) / 2;
_RandomAccessIter __middle = __first + __len;
if (__len > __buffer_size) {
__stable_sort_adaptive(__first, __middle, __buffer, __buffer_size);
__stable_sort_adaptive(__middle, __last, __buffer, __buffer_size);
}
else {
__merge_sort_with_buffer(__first, __middle, __buffer, (_Distance*)0);
__merge_sort_with_buffer(__middle, __last, __buffer, (_Distance*)0);
}
__merge_adaptive(__first, __middle, __last, _Distance(__middle - __first),
_Distance(__last - __middle), __buffer, __buffer_size);
}
template <class _RandomAccessIter, class _Pointer, class _Distance,
class _Compare>
void __stable_sort_adaptive(_RandomAccessIter __first,
_RandomAccessIter __last, _Pointer __buffer,
_Distance __buffer_size, _Compare __comp) {
_Distance __len = (__last - __first + 1) / 2;
_RandomAccessIter __middle = __first + __len;
if (__len > __buffer_size) {
__stable_sort_adaptive(__first, __middle, __buffer, __buffer_size,
__comp);
__stable_sort_adaptive(__middle, __last, __buffer, __buffer_size,
__comp);
}
else {
__merge_sort_with_buffer(__first, __middle, __buffer, (_Distance*)0,
__comp);
__merge_sort_with_buffer(__middle, __last, __buffer, (_Distance*)0,
__comp);
}
__merge_adaptive(__first, __middle, __last, _Distance(__middle - __first),
_Distance(__last - __middle), __buffer, __buffer_size,
__comp);
}
template <class _RandomAccessIter, class _Tp, class _Distance>
void __stable_sort_aux(_RandomAccessIter __first,
_RandomAccessIter __last, _Tp*, _Distance*) {
_Temporary_buffer<_RandomAccessIter, _Tp> buf(__first, __last);
_Tp* __begin = buf.begin();
if (__begin == 0)
__inplace_stable_sort(__first, __last);
else
__stable_sort_adaptive(__first, __last, __begin,
(_Distance)buf.size());
}
template <class _RandomAccessIter, class _Tp, class _Distance, class _Compare>
void __stable_sort_aux(_RandomAccessIter __first,
_RandomAccessIter __last, _Tp*, _Distance*,
_Compare __comp) {
_Temporary_buffer<_RandomAccessIter, _Tp> buf(__first, __last);
if (buf.begin() == 0)
__inplace_stable_sort(__first, __last, __comp);
else
__stable_sort_adaptive(__first, __last, buf.begin(),
_Distance(buf.size()),
__comp);
}
template <class _RandomAccessIter>
void stable_sort(_RandomAccessIter __first,
_RandomAccessIter __last) {
__stl_debug_check(__check_range(__first, __last));
__stable_sort_aux(__first, __last,
__VALUE_TYPE(__first),
__DISTANCE_TYPE(__first));
}
template <class _RandomAccessIter, class _Compare>
void stable_sort(_RandomAccessIter __first,
_RandomAccessIter __last, _Compare __comp) {
__stl_debug_check(__check_range(__first, __last));
__stable_sort_aux(__first, __last,
__VALUE_TYPE(__first),
__DISTANCE_TYPE(__first),
__comp);
}
// partial_sort, partial_sort_copy, and auxiliary functions.
template <class _RandomAccessIter, class _Tp>
void __partial_sort(_RandomAccessIter __first, _RandomAccessIter __middle,
_RandomAccessIter __last, _Tp*) {
make_heap(__first, __middle);
for (_RandomAccessIter __i = __middle; __i < __last; ++__i)
if (*__i < *__first)
__pop_heap(__first, __middle, __i, _Tp(*__i),
__DISTANCE_TYPE(__first));
sort_heap(__first, __middle);
}
template <class _RandomAccessIter, class _Tp, class _Compare>
void __partial_sort(_RandomAccessIter __first, _RandomAccessIter __middle,
_RandomAccessIter __last, _Tp*, _Compare __comp) {
make_heap(__first, __middle, __comp);
for (_RandomAccessIter __i = __middle; __i < __last; ++__i)
if (__comp(*__i, *__first))
__pop_heap(__first, __middle, __i, _Tp(*__i), __comp,
__DISTANCE_TYPE(__first));
sort_heap(__first, __middle, __comp);
}
template <class _InputIter, class _RandomAccessIter, class _Distance,
class _Tp>
_RandomAccessIter __partial_sort_copy(_InputIter __first,
_InputIter __last,
_RandomAccessIter __result_first,
_RandomAccessIter __result_last,
_Distance*, _Tp*) {
if (__result_first == __result_last) return __result_last;
_RandomAccessIter __result_real_last = __result_first;
while(__first != __last && __result_real_last != __result_last) {
*__result_real_last = *__first;
++__result_real_last;
++__first;
}
make_heap(__result_first, __result_real_last);
while (__first != __last) {
if (*__first < *__result_first)
__adjust_heap(__result_first, _Distance(0),
_Distance(__result_real_last - __result_first),
_Tp(*__first));
++__first;
}
sort_heap(__result_first, __result_real_last);
return __result_real_last;
}
template <class _InputIter, class _RandomAccessIter, class _Compare,
class _Distance, class _Tp>
_RandomAccessIter __partial_sort_copy(_InputIter __first,
_InputIter __last,
_RandomAccessIter __result_first,
_RandomAccessIter __result_last,
_Compare __comp, _Distance*, _Tp*) {
if (__result_first == __result_last) return __result_last;
_RandomAccessIter __result_real_last = __result_first;
while(__first != __last && __result_real_last != __result_last) {
*__result_real_last = *__first;
++__result_real_last;
++__first;
}
make_heap(__result_first, __result_real_last, __comp);
while (__first != __last) {
if (__comp(*__first, *__result_first))
__adjust_heap(__result_first, _Distance(0),
_Distance(__result_real_last - __result_first),
_Tp(*__first),
__comp);
++__first;
}
sort_heap(__result_first, __result_real_last, __comp);
return __result_real_last;
}
// nth_element() and its auxiliary functions.
template <class _RandomAccessIter, class _Tp>
void __nth_element(_RandomAccessIter __first, _RandomAccessIter __nth,
_RandomAccessIter __last, _Tp*) {
while (__last - __first > 3) {
_RandomAccessIter __cut =
__unguarded_partition(__first, __last,
_Tp(__median(*__first,
*(__first + (__last - __first)/2),
*(__last - 1))));
if (__cut <= __nth)
__first = __cut;
else
__last = __cut;
}
__insertion_sort(__first, __last);
}
template <class _RandomAccessIter, class _Tp, class _Compare>
void __nth_element(_RandomAccessIter __first, _RandomAccessIter __nth,
_RandomAccessIter __last, _Tp*, _Compare __comp) {
while (__last - __first > 3) {
_RandomAccessIter __cut =
__unguarded_partition(__first, __last,
_Tp(__median(*__first,
*(__first + (__last - __first)/2),
*(__last - 1),
__comp)),
__comp);
if (__cut <= __nth)
__first = __cut;
else
__last = __cut;
}
__insertion_sort(__first, __last, __comp);
}
template <class _ForwardIter, class _Tp, class _Distance>
_ForwardIter __lower_bound(_ForwardIter __first, _ForwardIter __last,
const _Tp& __val, _Distance*)
{
_Distance __len = 0;
distance(__first, __last, __len);
_Distance __half;
_ForwardIter __middle;
while (__len > 0) {
__half = __len >> 1;
__middle = __first;
advance(__middle, __half);
if (*__middle < __val) {
__first = __middle;
++__first;
__len = __len - __half - 1;
}
else
__len = __half;
}
return __first;
}
template <class _ForwardIter, class _Tp, class _Compare, class _Distance>
_ForwardIter __lower_bound(_ForwardIter __first, _ForwardIter __last,
const _Tp& __val, _Compare __comp, _Distance*)
{
_Distance __len = 0;
distance(__first, __last, __len);
_Distance __half;
_ForwardIter __middle;
while (__len > 0) {
__half = __len >> 1;
__middle = __first;
advance(__middle, __half);
if (__comp(*__middle, __val)) {
__first = __middle;
++__first;
__len = __len - __half - 1;
}
else
__len = __half;
}
return __first;
}
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