diff options
Diffstat (limited to 'src/common/db.h')
| -rw-r--r-- | src/common/db.h | 44 |
1 files changed, 32 insertions, 12 deletions
diff --git a/src/common/db.h b/src/common/db.h index b6258d061..15cf28295 100644 --- a/src/common/db.h +++ b/src/common/db.h @@ -1288,12 +1288,11 @@ void linkdb_final ( struct linkdb_node** head ); size_t _i_ = VECTOR_LENGTH(__heap); \ VECTOR_PUSH(__heap,__val); /* insert at end */ \ while( _i_ ) \ - { /* restore heap property */ \ + { /* restore heap property in parents */ \ size_t _parent_ = (_i_-1)/2; \ - if( __topcmp(VECTOR_INDEX(__heap,_parent_),__val) < 0 ) \ + if( __topcmp(VECTOR_INDEX(__heap,_parent_),VECTOR_INDEX(__heap,_i_)) < 0 ) \ break; /* done */ \ - VECTOR_INDEX(__heap,_i_) = VECTOR_INDEX(__heap,_parent_); \ - VECTOR_INDEX(__heap,_parent_) = __val; \ + swap(VECTOR_INDEX(__heap,_parent_),VECTOR_INDEX(__heap,_i_)); \ _i_ = _parent_; \ } \ }while(0) @@ -1310,12 +1309,35 @@ void linkdb_final ( struct linkdb_node** head ); /// /// @param __heap Binary heap /// @param __topcmp Comparator -#define BHEAP_POP(__heap,__topcmp) \ +#define BHEAP_POP(__heap,__topcmp) BHEAP_POPINDEX(__heap,0,__topcmp) + + + +/// Removes the target value of the heap. (using the '=' operator) +/// Assumes the index exists. +/// +/// The comparator takes two values as arguments, returns: +/// - negative if the first value is on the top +/// - positive if the second value is on the top +/// - 0 if they are equal +/// +/// @param __heap Binary heap +/// @param __idx Index +/// @param __topcmp Comparator +#define BHEAP_POPINDEX(__heap,__idx,__topcmp) \ do{ \ - size_t _i_ = 0; \ - VECTOR_INDEX(__heap,0) = VECTOR_POP(__heap); /* put last at top */ \ + size_t _i_ = __idx; \ + VECTOR_INDEX(__heap,__idx) = VECTOR_POP(__heap); /* put last at index */ \ + while( _i_ ) \ + { /* restore heap property in parents */ \ + size_t _parent_ = (_i_-1)/2; \ + if( __topcmp(VECTOR_INDEX(__heap,_parent_),VECTOR_INDEX(__heap,_i_)) < 0 ) \ + break; /* done */ \ + swap(VECTOR_INDEX(__heap,_parent_),VECTOR_INDEX(__heap,_i_)); \ + _i_ = _parent_; \ + } \ while( _i_ < VECTOR_LENGTH(__heap) ) \ - { /* restore heap property */ \ + { /* restore heap property in childs */ \ size_t _lchild_ = _i_*2 + 1; \ size_t _rchild_ = _i_*2 + 2; \ if( (_lchild_ >= VECTOR_LENGTH(__heap) || __topcmp(VECTOR_INDEX(__heap,_i_),VECTOR_INDEX(__heap,_lchild_)) <= 0) && \ @@ -1323,14 +1345,12 @@ void linkdb_final ( struct linkdb_node** head ); break; /* done */ \ else if( _rchild_ >= VECTOR_LENGTH(__heap) || __topcmp(VECTOR_INDEX(__heap,_lchild_),VECTOR_INDEX(__heap,_rchild_)) <= 0 ) \ { /* left child */ \ - VECTOR_INDEX(__heap,_i_) = VECTOR_INDEX(__heap,_lchild_); \ - VECTOR_INDEX(__heap,_lchild_) = VECTOR_INDEX(__heap,VECTOR_LENGTH(__heap)); \ + swap(VECTOR_INDEX(__heap,_i_),VECTOR_INDEX(__heap,_lchild_)); \ _i_ = _lchild_; \ } \ else \ { /* right child */ \ - VECTOR_INDEX(__heap,_i_) = VECTOR_INDEX(__heap,_rchild_); \ - VECTOR_INDEX(__heap,_rchild_) = VECTOR_INDEX(__heap,VECTOR_LENGTH(__heap)); \ + swap(VECTOR_INDEX(__heap,_i_),VECTOR_INDEX(__heap,_rchild_)); \ _i_ = _rchild_; \ } \ } \ |