我有以下4个文件不可见:模板:父类的成员变量在继承类
arrayListType.h
:声明并定义arrayListType
类为模板unorderedArrayListType.h
:从arrayListType
类继承,并声明和定义unorderedArrayListType
作为模板。测试程序类。Makefile
我得到一个编译错误访问时arrayListType
保护变量unorderedArrayListType
例如说:“长度在此范围内没有声明”,其中长度和列表“在此范围内未申报清单”是arrayListType
类中的受保护变量。
以下是代码:
arrayListType.h
#ifndef H_arrayListType
#define H_arrayListType
#include <iostream>
using namespace std;
template <class elemType>
class arrayListType
{
public:
const arrayListType<elemType>&operator=(const arrayListType<elemType>&);
bool isEmpty() const;
bool isFull() const;
int listSize() const;
int maxListSize() const;
void print() const;
bool isItemAtEqual(int location, const elemType& item) const;
virtual void insertAt(int location, const elemType& insertItem) = 0;
virtual void insertEnd(const elemType& insertItem) = 0;
void removeAt(int location);
void retrieveAt(int location, elemType& retItem) const;
virtual void replaceAt(int location, const elemType& repItem) = 0;
void clearList();
virtual int seqSearch(const elemType& searchItem) const;
virtual void remove(const elemType& removeItem) = 0;
arrayListType(int size = 100);
arrayListType(const arrayListType<elemType>& otherList);
virtual ~arrayListType();
protected:
elemType *list;
int length;
int maxSize;
};
template <class elemType>
bool arrayListType<elemType>::isEmpty() const
{
return (length == 0);
}
// remaining non-virtual functions of arrayListType class
#endif
unorderedArrayListType.h
#ifndef H_unorderedArrayListType
#define H_unorderedArrayListType
//#include <iostream>
#include "arrayListType.h"
//using namespace std;
template <class elemType>
class unorderedArrayListType: public arrayListType<elemType>
{
public:
void insertAt(int location, const elemType& insertItem);
void insertEnd(const elemType& insertItem);
void replaceAt(int location, const elemType& repItem);
int seqSearch(const elemType& searchItem) const;
void remove(const elemType& removeItem);
unorderedArrayListType(int size = 100);
};
template <class elemType>
void unorderedArrayListType<elemType>::insertAt(int location, const elemType& insertItem)
{
for(int i = length; i > location; i--)
list[i] = list[i - 1];
list[location] = insertItem;
length++;
}
// Remaining virtual functions that need to be defined by the inherited class
#endif
main1.cpp
#include <iostream>
#include "unorderedArrayListType.h"
using namespace std;
int main()
{
unorderedArrayListType<int> intList(25);
int number;
cout<<"Line 3: Enter 8 integers: ";
for(int count = 0; count < 8; count++)
{
cin>>number;
intList.insertEnd(number);
}
cout<<"Line 8: intList: ";
intList.print();
cout<<endl;
}
生成文件:
all: main1
main1.o: main1.cpp
g++ -c -Wall main1.cpp
main1: main1.o
g++ -Wall main1.o -o main
clean:
rm -f *.o *~ main1
以下是编译错误:unorderedArrayListType
指示为范围没有宣布上市和受保护的变量的
make
g++ -c -Wall main1.cpp
In file included from main1.cpp:2:
unorderedArrayListType.h: In member function 'void unorderedArrayListType<elemType>::insertAt(int, const elemType&)':
unorderedArrayListType.h:30: error: 'length' was not declared in this scope
unorderedArrayListType.h:31: error: 'list' was not declared in this scope
unorderedArrayListType.h:33: error: 'list' was not declared in this scope
更多的功能。想知道可能是什么错误。
新的错误:
make
g++ -Wall main1.o -o main
Undefined first referenced
symbol in file
arrayListType<int>::seqSearch(int const&) constmain1.o
ld: fatal: Symbol referencing errors. No output written to main
collect2: ld returned 1 exit status
*** Error code 1
make: Fatal error: Command failed for target `main1'
可能的重复[为什么我必须通过此指针访问模板基类成员?](http://stackoverflow.com/questions/4643074/why-do-i-have-to-access-template-基地级会员通过这个指针) – Pradhan