广义表的实现
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广义表是一种非线性表的数据结构,是线性表的一种推广。他放松了对原子的控制,容许原子有自身的结构。其实现如下:
#include<iostream>
using namespace std;
#include<assert.h>
enum Type //原子类型有三种:头结点,子表节点和值节点
{
HEAD,
SUB,
VALUE
};
template<class T>
struct GeneralListNode //广义表节点
{
Type _type; //节点类型
GeneralListNode* _next; //节点的下一个
union //当节点的类型不是值节点就是子表节点
{
T _value;
GeneralListNode* _SubLink;
};
GeneralListNode(Type type, char s) //当节点值节点时的构造函数
:_type(type)
, _value(s)
, _next(NULL)
{}
GeneralListNode(Type type) //当节点为子表节点或头结点时的构造函数
:_type(type)
, _next(NULL)
, _SubLink(NULL)
{}
};
template<class T>
class GeneralList
{
public:
GeneralList() //构造函数
:_head(NULL)
{}
GeneralList(char* s) //构造函数
{
_head = _CreateList(s);
}
~GeneralList() //析构函数
{
_Destory(_head);
}
GeneralList(const GeneralList<T>& t) //拷贝构造函数
{
_head = _Copy(t._head);
}
GeneralList& operator=(GeneralList<T> t) //赋值运算符的重载
{
swap(t._head, _head);
return *this;
}
void Print() //打印函数
{
_Print(_head);
cout << endl;
}
size_t Size() //求广义表节点的个数
{
return _Size(_head);
cout << endl;
}
size_t Depth() //求广义表的深度
{
return _Depth(_head);
}
protected:
size_t _Depth(GeneralListNode<T>* head)
{
GeneralListNode<T>* cur = head;
size_t Maxdepth = 1;
while (cur)
{
if (cur->_type == SUB)
{
size_t depth = _Depth(cur->_SubLink);
if (depth+1>Maxdepth)
{
Maxdepth = depth+1;
}
}
cur = cur->_next;
}
return Maxdepth;
}
GeneralListNode<T>* _Copy(GeneralListNode<T>* head)
{
assert(head);
GeneralListNode<T>* Newhead = new GeneralListNode<T>(HEAD);
GeneralListNode<T>* cur = head->_next;
GeneralListNode<T>* newcur = Newhead;
while (cur)
{
if (cur->_type == VALUE)
{
newcur->_next = new GeneralListNode<T>(VALUE, cur->_value);
newcur = newcur->_next;
}
if (cur->_type == SUB)
{
newcur->_next = new GeneralListNode<T>(SUB);
newcur = newcur->_next;
newcur->_SubLink = _Copy(cur->_SubLink);
}
cur = cur->_next;
}
return Newhead;
}
int _Size(GeneralListNode<T>* head)
{
GeneralListNode<T>* cur = head;
size_t Count=0;
while (cur)
{
if (cur->_type==VALUE)
{
Count++;
}
if (cur->_type == SUB)
{
Count += _Size(cur->_SubLink);
}
cur = cur->_next;
}
return Count;
}
void _Print(GeneralListNode<T>* head)
{
GeneralListNode<T>* cur = head;
while (cur)
{
if (cur->_type == HEAD)
{
cout << ‘(‘;
}
else if (cur->_type == VALUE)
{
cout << cur->_value << " ";
if (cur->_next)
{
cout << ‘,‘;
}
}
else //cur->_type==SUB
{
_Print(cur->_SubLink);
if (cur->_next)
{
cout << ‘)‘;
}
}
cur = cur->_next;
}
cout << ‘)‘;
}
bool Isvalue(char ch)
{
return (ch >= ‘0‘&&ch <= ‘9‘) || (ch >= ‘a‘&&ch <= ‘z‘) || (ch >= ‘A‘&&ch <= ‘Z‘);
}
GeneralListNode<T>* _CreateList(char*& s)
{
assert(*s == ‘(‘);
GeneralListNode<T>* head = new GeneralListNode<T>(HEAD);
++s;
GeneralListNode<T>* cur = head;
while (*s)
{
if (*s == ‘(‘)
{
GeneralListNode<T>* SubNode = new GeneralListNode<T>(SUB);
cur->_next = SubNode;
cur = cur->_next;
SubNode->_SubLink = _CreateList(s);
}
else if (*s == ‘)‘)
{
++s;
break;
}
else if ( Isvalue(*s))
{
GeneralListNode<T>* ValueNode = new GeneralListNode<T>(VALUE, *s);
cur->_next = ValueNode;
cur = cur->_next;
++s;
}
else
{
++s;
}
}
return head;
}
void _Destory(GeneralListNode<T>* head)
{
GeneralListNode<T>* cur = head;
while (cur)
{
GeneralListNode<T>* del = cur;
cur = cur->_next;
if (del->_type ==SUB)
{
_Destory(del->_SubLink);
}
delete del;
}
}
private:
GeneralListNode<T>* _head;
};
/////////////////////////////////////////////////////////////////////
主函数:
#include"GeneralList.h"
void main()
{
GeneralList<char> g1("()");
GeneralList<char> g2("(a,b)");
GeneralList<char> g3("(a,b,(c,d))");
GeneralList<char> g4("(a,b,(c,d),(e,(f),h))");
GeneralList<char> g5;
g5 = g4;
g4.Print();
cout << g4.Size() << endl;
cout << g4.Depth() << endl;
g5.Print();
}
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