数据结构C++,线性表的实现(数组方式)
#include <iostream>
#include <sstream>
#include <fstream>
#include <cmath>
#include <iterator>
#include <algorithm>
template<class T>
class linearList {
public:
virtual ~linearList(){}
virtual bool empty() const=0;
virtual int size() const=0;
virtual T& get(int theIndex) const=0;
virtual int indexOf(const T& theElement) const=0;
virtual void erase(int theIndex)=0;
virtual void insert(int theIndex, const T& theElement)=0;
};
template<class T>
void changeLength1D(T*& a, int oldLength, int newLength) {
if(newLength<0) {
std::cout<<"new length must be >=0"<<std::endl;
exit(-1);
}
T* temp=new T[newLength];
int number=std::min(oldLength,newLength);
std::copy(a,a+number,temp);
delete [] a;
a=temp;
}
template<class T>
class arrayList:public linearList<T> {
public:
arrayList(int initialCapacity=10);
arrayList(const arrayList<T> &);
~arrayList() {
delete [] element;
}
bool empty() const {
return listSize==0;
}
int size() const {
return listSize;
}
T& get(int theIndex) const;
int indexOf(const T& theElement) const;
void erase(int theIndex);
void insert(int theIndex, const T& theElement);
int capacity() const {
return arrayLength;
}
protected:
void checkIndex(int theIndex) const;
T* element;
int arrayLength;
int listSize;
};
template<class T>
arrayList<T>::arrayList(int initialCapacity) {
if(initialCapacity<1) {
std::ostringstream s;
s<<"Initial Capacity = "<<initialCapacity<<" Must be > 0 ";
exit(-1);
}
arrayLength=initialCapacity;
element=new T[arrayLength];
listSize=0;
}
template<class T>
arrayList<T>::arrayList(const arrayList<T>& theList) {
arrayLength=theList.arrayLength;
listSize=theList.listSize;
element=new T[arrayLength];
std::copy(theList.element,theList.element+listSize,element);
}
template<class T>
void arrayList<T>::checkIndex(int theIndex) const {
if(theIndex<0 || theIndex>=listSize) {
std::ostringstream s;
s<<"index = "<<theIndex<<" size = "<<listSize;
exit(-1);
}
}
template<class T>
T& arrayList<T>::get(int theIndex) const {
checkIndex(theIndex);
return element[theIndex];
}
template<class T>
int arrayList<T>::indexOf(const T& theElement) const {
int theIndex=(int)(std::find(element,element+listSize,theElement)-element);
if(theIndex == listSize)
return -1;
else
return theIndex;
}
template<class T>
void arrayList<T>::erase(int theIndex) {
checkIndex(theIndex);
std::copy(element+theIndex+1,element+listSize,element+theIndex);
element[--listSize].~T();
}
template<class T>
void arrayList<T>::insert(int theIndex,const T& theElement) {
if(theIndex<0 || theIndex>listSize) {
std::ostringstream s;
s<<"index = "<<theIndex<<" size = "<<listSize;
}
if(listSize == arrayLength) {
changeLength1D(element,arrayLength,2*arrayLength);
arrayLength*=2;
}
std::copy_backward(element+theIndex,element+listSize,element+listSize+1);
element[theIndex]=theElement;
listSize++;
}
int main() {
arrayList<int> z;
for(size_t i=0;i<30;++i) {
z.insert(0,i);
}
for(size_t i=0;i<z.size();++i) {
std::cout<<z.get(i)<<" ";
}
return 0;
}