紅黑樹的C 實現（2）

因為紅黑樹首先是二叉所搜樹，所以有了二叉搜尋樹的實現，我們就可以重用部分二叉搜尋樹的類的介面了，rbt.h：

#ifndef __rbt_h__

#define __rbt_h__
#include "bst.h"
template class credblacktree : public cbinarysorttree
virtual cbinarytreenode* insert(const t& key);
virtual void delete(cbinarytreenode** del);
virtual void inorderwalk() const;
private:
void insertfixup(cbinarytreenode* node);
void deletefixup(cbinarytreenode* node);
void leftrotate(cbinarytreenode* node);
void rightrotate(cbinarytreenode* node);
void inorderwalk(const cbinarytreenode* node) const;
};template credblacktree::credblacktree() : cbinarysorttree()
template cbinarytreenode* credblacktree::insert(const t& key)
template void credblacktree::delete(cbinarytreenode** del)
else 
fixup->parent = parent; // 'cause sentinel's parent points to itself
} else 
temp = node;
} else if (node->left == &cbinarysorttree::sentinel && node->right != &cbinarysorttree::sentinel) else if (node->left != &cbinarysorttree::sentinel && node->right == &cbinarysorttree::sentinel) else else
fixup->parent = successor; // 'cause sentinel's parent points to itself
temp = this->transplant(node, successor);
successor->left = node->left;
successor->left->parent = successor;
successor->color = (*del)->color; // remain the original color
} if (original_color == cbinarytreenode::black && this->root != &cbinarysorttree::sentinel)
deletefixup(fixup);
delete temp;
}template void credblacktree::inorderwalk() const
template void credblacktree::inorderwalk(const cbinarytreenode* node) const
}template void credblacktree::insertfixup(cbinarytreenode* node)
else 
node->parent->color = cbinarytreenode::black;
node->parent->parent->color = cbinarytreenode::red;
rightrotate(node->parent->parent);
}} else else 
node->parent->color = cbinarytreenode::black;
node->parent->parent->color = cbinarytreenode::red;
leftrotate(node->parent->parent);
}} }
this->root->color = cbinarytreenode::black;
}template void credblacktree::deletefixup(cbinarytreenode* node)
if (w->left->color == cbinarytreenode::black && w->right->color == cbinarytreenode::black) else 
w->color = node->parent->color;
w->right->color = cbinarytreenode::black;
node->parent->color = cbinarytreenode::black;
leftrotate(node->parent);
node = this->root;
}} else 
if (w->left->color == cbinarytreenode::black && w->right->color == cbinarytreenode::black) else 
w->color = node->parent->color;
w->left->color = cbinarytreenode::black;
node->parent->color = cbinarytreenode::black;
rightrotate(node->parent);
node = this->root;
}} }
node->color = cbinarytreenode::black;
}template void credblacktree::leftrotate(cbinarytreenode* node)
template void credblacktree::rightrotate(cbinarytreenode* node)
#endif

最後，測試紅黑樹的**，rbt_test.cpp：

#include "rbt.h"

int main(int argc, const char **argv)
; credblacktreerbt;
cout << "original key: " << endl;
for (size_t i = 0; i < sizeof(key) / sizeof(int); ++i)
cout << key[i] << ' ';
cout << endl;
for (size_t i = 0; i < sizeof(key) / sizeof(int); ++i) 
cout << endl;
for (size_t i = 0; i < sizeof(key) / sizeof(int); ++i) 
} return 0;
}

附：c++的一大特性是多型，由於二叉搜尋樹類是紅黑樹類的父類，所以，我們可以使用二叉搜尋樹類的指標或者引用在執行時動態繫結紅黑樹的成員函式，實現多型，rbt_test.cpp：

#include "rbt.h"

using std::runtime_error;
int main(int argc, const char **argv)
; cbinarysorttree* pbst = null;
try 
cout << endl;
for (size_t i = 0; i < sizeof(key) / sizeof(int); ++i) 
} delete pbst;
} catch (...) 
pbst = null;
return 0;
}

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