【文件属性】：
文件名称：B树的C++实现
文件大小：13KB
文件格式：ZIP
更新时间：2016-11-19 12:53:00
B树,C++
用 C++ 实现的一个 B 树类，有注释，但不知道我写得能不能看明白。使用时先要从类 CDataTypeForBtree 派生一个类出来，在派生类中实现数据比较函数 Compare，数据输出函数 Print。然后在堆上创建一个数据类对象，把地址作为构造函数的参数创建树对象，下面给出一个使用示例。
#include
#include
#include "DataTypeForBtree.h"
#include "BTree.h"
struct tree_data
{
char tid[37];
char tname[63];
unsigned int aid;
unsigned int id;
};
class CMyDataTypeForBtree : public CDataTypeForBtree
{
public:
virtual void Print(void *key, FILE* fp)
{
if(NULL == key || NULL == fp)
return;
struct tree_data* tr = (struct tree_data*)key;
fprintf(fp, "%u %u %s %s\n", tr->id, tr->aid, tr->tid, tr->tname);
}
virtual int Compare(void *p1, void *p2)
{
if(NULL == p1 || NULL == p2)
return (int)(((unsigned int)(~0)) >> 1); //返回一个大点的数表示失败
struct tree_data *tr1, *tr2;
tr1 = (struct tree_data*)p1;
tr2 = (struct tree_data*)p2;
if(tr2->aid != tr1->aid)
{
return tr1->aid - tr2->aid;
}
if('\0' == tr1->tid[0] && '\0' == tr2->tid[0])
{
return strcmp(tr1->tname, tr2->tname);
}
return strcmp(tr1->tid, tr2->tid);
}
CMyDataTypeForBtree()
{
}
virtual ~CMyDataTypeForBtree()
{
}
};
int main(int argc, char* argv[])
{
CMyDataTypeForBtree *dt = new CMyDataTypeForBtree;
CBTree tree(dt, 5);
struct tree_data tr[101] = {{"asd", "4Hero", 1, 1}, {"abc", "Underworld", 1, 0}, {"bac", "Samantha", 1, 2}, {"cass", "Gelka", 1, 3},
{"mark", "Clark", 1, 4}, {"gone", "Woolfy", 1, 5}, {"word", "Production", 1, 6}, {"paper", "Jimpster", 1, 7}, {"Richie", "Hawtin", 1, 8},
{"John", "Matthias", 1, 9}, {"Lou", "Donaldson", 1, 10}, {"Lady", "Alma", 1, 11}, {"Mass", "Slick", 1, 12}, {"Clyde", "Alexander", 1, 13},
//……省略若干，省略部分在下载包里面有
{"", "I'M Not Sayin' Get 'Er Done, But Don'T Just Stand There", 11, 101},};
for(int i = 0; i < 101; i++)
{
tree.Insert((void*)(tr + i));
}
tree.DelKey((void*)(tr + 5));
tree.Traverse(NULL, NULL);
tree.DelKey((void*)(tr + 13));
tree.Traverse(NULL, NULL); //输出到标准输出，可以重定向到文件
return 0;
}
【文件预览】：
test.cpp
MyDataTypeForBtree.cpp
BTree.h
DataTypeForBtree.h
DataTypeForBtree.cpp
BTree.cpp
MyDataTypeForBtree.h
