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修改重分配算法，大幅提高前插的效率

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邹晓航
2014-10-22 19:15:29 +08:00
parent eff34f36dc
commit b7fc59cf12
1 changed files with 1 additions and 1 deletions
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TinySTL/Deque.h
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@@ -264,7 +264,7 @@ namespace TinySTL{
void deque<T, Alloc>::reallocateAndCopy(){ void deque<T, Alloc>::reallocateAndCopy(){
auto newMapSize = getNewMapSize(mapSize_); auto newMapSize = getNewMapSize(mapSize_);
T** newMap = getANewMap(newMapSize); T** newMap = getANewMap(newMapSize);
size_t startIndex = (newMapSize < 5) ? 1 : 2; size_t startIndex = newMapSize / 4;
for (int i = 0; i + beg_.mapIndex_ != mapSize_; ++i) for (int i = 0; i + beg_.mapIndex_ != mapSize_; ++i)
for (int j = 0; j != getBuckSize(); ++j) for (int j = 0; j != getBuckSize(); ++j)
newMap[startIndex + i][j] = map_[beg_.mapIndex_ + i][j]; newMap[startIndex + i][j] = map_[beg_.mapIndex_ + i][j];