C++ 错误提示 传入的参数类型不能自动转换，

[小灰灰诶~]

#include <iostream>
#include "myarray.h"
#include "arrayiterator.h"
#include "display.h"
#include "student.h"

using namespace std;

int main() {

        myarray<student *> ary_s;
        student *n1 = new student("Tom", 80);
        student *n2 = new student("Jone", 75);
        student *n3 = new student("Anna", 90);
        ary_s.add(n1);
        ary_s.add(n2);
        ary_s.add(n3);

        arrayiterator<student *> start(ary_s.Begin());
        arrayiterator<student *> end(ary_s.End());

        display<arrayiterator<student *> >(start, end);

        return 0;
}

这个是主函数， myarray<student *> ary_s; 这里传入的是 指针。

#ifndef _MYARRAY_H_
#define _MYARRAY_H_
#include <stdio.h>
#include<iostream>
using namespace std;
template <class T>

class myarray
{
	private:
		int m_nTotalSize;
		int m_nValidSize;
		T*m_pData;
	public:
		myarray(int nSize=3)
		{
			m_pData=new T[nSize];
			m_nTotalSize=nSize;
			m_nValidSize=0;
		}
		void add(T value)
		{
			if(m_nValidSize<m_nTotalSize)
			{
				m_pData[m_nValidSize]=value;
				m_nValidSize++;
			}
			else
			{
				int i=0;
				T*tmpData=new T[m_nTotalSize];
				for(i=0;i<m_nTotalSize;i++)
				{
					tmpData[i]=m_pData[i];
				}
				delete []m_pData;
				m_nTotalSize*=2;
				m_pData=new T[m_nTotalSize];
				for(i=0;i<m_nValidSize;i++)
				{
					m_pData[i]=tmpData[i];
				}
				delete []tmpData;
				m_pData[m_nValidSize]=value;
				m_nValidSize++;
			}
		}
		int GetSize()
		{
			return m_nValidSize;
		}
		T Get (int pos)
		{
			return m_pData[pos];
		}
		virtual~myarray()
		{
			 if(m_pData!=NULL);
			 {
				 delete []m_pData;
				 m_pData=NULL;
			 }
		}
	T*Begin()
	{
		return m_pData;
	}
	 T*End()
	 {
		 return m_pData+m_nValidSize;
	 }

};
#endif

但是这里myarray的类型不是指针， 编译总报错， 迷迷糊糊的知道问题在哪，可是不会改，老师说用 函数重载。。。只给了这么个提示operator<<(ostream&,student*） 百度了一上午，还是不会啊，求助。。。

[似缘非缘]

同学，用什么编译，报什么错，你总得贴出来吧。

[见识决定命运]

你NEW 出来的是一个指针，add()的参数是类对向，类型不匹配。 T*m_pData; 应当是 T **m_pData;

[小灰灰诶~]

ummmmm... 就是这样
||=== Build: Debug in hmfb (compiler: GNU GCC Compiler) ===|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h||In member function 'int arrayiterator<Init>::arratiterator(Init*)':|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h|15|warning: no return statement in function returning non-void [-Wreturn-type]|
C:\Users\DELSJ\Desktop\hmfb\main.cpp||In function 'int main()':|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|12|warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|13|warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|14|warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|19|error: no matching function for call to 'arrayiterator<student*>::arrayiterator(student**)'|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|19|note: candidates are:|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h|8|note: arrayiterator<student*>::arrayiterator()|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h|8|note: candidate expects 0 arguments, 1 provided|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h|8|note: arrayiterator<student*>::arrayiterator(const arrayiterator<student*>&)|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h|8|note: no known conversion for argument 1 from 'student**' to 'const arrayiterator<student*>&'|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|20|error: no matching function for call to 'arrayiterator<student*>::arrayiterator(student**)'|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|20|note: candidates are:|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h|8|note: arrayiterator<student*>::arrayiterator()|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h|8|note: candidate expects 0 arguments, 1 provided|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h|8|note: arrayiterator<student*>::arrayiterator(const arrayiterator<student*>&)|
C:\Users\DELSJ\Desktop\hmfb\arrayiterator.h|8|note: no known conversion for argument 1 from 'student**' to 'const arrayiterator<student*>&'|
C:\Users\DELSJ\Desktop\hmfb\myarray.h||In instantiation of 'myarray<T>::myarray(int) [with T = student*]':|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|11|required from here|
C:\Users\DELSJ\Desktop\hmfb\myarray.h|17|error: cannot convert 'student**' to 'student***' in assignment|
C:\Users\DELSJ\Desktop\hmfb\myarray.h||In instantiation of 'void myarray<T>::add(T) [with T = student*]':|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|15|required from here|
C:\Users\DELSJ\Desktop\hmfb\myarray.h|25|error: cannot convert 'student*' to 'student**' in assignment|
C:\Users\DELSJ\Desktop\hmfb\myarray.h|34|error: cannot convert 'student**' to 'student*' in assignment|
C:\Users\DELSJ\Desktop\hmfb\myarray.h|38|error: cannot convert 'student**' to 'student***' in assignment|
C:\Users\DELSJ\Desktop\hmfb\myarray.h|41|error: cannot convert 'student*' to 'student**' in assignment|
C:\Users\DELSJ\Desktop\hmfb\myarray.h|44|error: cannot convert 'student*' to 'student**' in assignment|
C:\Users\DELSJ\Desktop\hmfb\myarray.h||In instantiation of 'T* myarray<T>::Begin() [with T = student*]':|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|19|required from here|
C:\Users\DELSJ\Desktop\hmfb\myarray.h|66|error: cannot convert 'student***' to 'student**' in return|
C:\Users\DELSJ\Desktop\hmfb\myarray.h||In instantiation of 'T* myarray<T>::End() [with T = student*]':|
C:\Users\DELSJ\Desktop\hmfb\main.cpp|20|required from here|
C:\Users\DELSJ\Desktop\hmfb\myarray.h|70|error: cannot convert 'student***' to 'student**' in return|
||=== Build failed: 10 error(s), 12 warning(s) (0 minute(s), 0 second(s)) ===|

[小灰灰诶~]

引用 1 楼 zh19921107 的回复:

同学，用什么编译，报什么错，你总得贴出来吧。

用的CodeBlock 16.01 GCC 编译

[小灰灰诶~]

引用 2 楼 11287011 的回复:

你NEW 出来的是一个指针，add()的参数是类对向，类型不匹配。 T*m_pData; 应当是 T **m_pData;

我刚试了下 不对哇