友元类

 

// "handlefile.h"

#include "baseFileFunction.h"

class handleFile 
{
public:

class FileFunction;

handleFile();
~handleFile();
void retrievedOperatorFile();
void retrievedSourceFile();
void retrievedReservedFile();

void writeBackFile();

private:

FileFunction *operatorFile;

FileFunction *sourceFile;

FileFunction *reservedFile;






/*std::vector<std::string> *lineOfOperatorFile;
std::vector<std::string> *signalOperatorFile;

std::vector<std::string> *lineOfSourceFile;
std::vector<std::string> *signalSourceFile;

std::vector<std::string> *lineOfRetrievedFile;
std::vector<std::string> *signalRetrievedFle;*/








};

//"baseFileFunction.h"

#ifndef BASEFILE_H
#define  BASEFILE_H
#include <fstream>
#include <vector>
#include <string>
#include <utility>
//#include "handlefile.h"

class FileFunction
{

friend  class handleFile;
public:
 FileFunction();
 ~FileFunction();
 void retrievedFile();
 void splitLineWord();

 /*void writeBackLineFile();
 void writeBackSignalFile();*/
// virtual void writeBackFile();



private: 
 std::vector<std::string> *lineWord;
 std::vector<std::string> *signalWord;

 std::vector<int> *lineNumber;
 std::vector<int> *signalNumber;


 typedef std::pair<std::vector<int> *,std::vector<std::string> *> location;

 location *signalLocation;
 location *lineLocation;

};
#endif





 //handlefile.cpp

#include "handlefile.h"
#include "baseFileFunction.h"

handleFile::handleFile()
:operatorFile(NULL),
 sourceFile(NULL),
 reservedFile(NULL)
{
  operatorFile=new FileFunction;
  sourceFile=new FileFunction;
  reservedFile=new FileFunction;
}

handleFile::~handleFile()
{
delete operatorFile;
delete sourceFile;
delete reservedFile;
}

void handleFile::retrievedSourceFile()
{
sourceFile->retrievedFile();
}

void handleFile::retrievedOperatorFile()
{
operatorFile->retrievedFile();
}

void handleFile::retrievedReservedFile()
{
reservedFile->retrievedFile();
}

void handleFile::writeBackFile()
{
using namespace std;

ofstream outfile;

}


///baseFileFunction.cpp

#include "baseFileFunction.h"
#include <iostream>


FileFunction::FileFunction()
:lineWord(NULL),signalWord(NULL),
 lineLocation(NULL),signalLocation(NULL)
{
lineWord=new std::vector<std::string>;
signalWord=new std::vector<std::string>;
lineNumber=new std::vector<int>;
signalNumber=new std::vector<int>;

}

FileFunction::~FileFunction()
{
  delete lineWord;
  delete signalWord; 
 

  delete lineLocation;
  delete signalLocation;
 
}

//void FileFunction::writeBackFile()
//{
//
//}

void FileFunction::retrievedFile()
{
using namespace std;

std::string filePath;

bool isSureOpenFile=false;

while(!isSureOpenFile)
{
std::cout<<"Please input file path:";
std::cin>>filePath;

if (filePath.length()==0)
std::cout<<"Can`t get file path,please input file path again."<<endl ;

else
{
std::cout<<"confirm this file path:";

string ch;
cin>>ch;
if ( ch!="No" && ch!="no" && ch!= "n" )
isSureOpenFile=true;
}
}


ifstream infile(filePath.c_str(),ios::in);

if (!infile)
{
cerr<<"Open file failed!!"<<endl;
exit(1);
}

string strTemp;


int LineNumber=1 ; 
while (!infile.eof())
{
getline(infile,strTemp,'\n');
lineWord->push_back(strTemp);
lineNumber->push_back(LineNumber);
LineNumber++;
}

infile.close();

lineLocation->first=lineNumber;
lineLocation->second=lineWord;
}

void FileFunction::splitLineWord()
{
using namespace std;

vector<string>::iterator it=lineWord->begin(),
 itEnd=lineWord->end();

vector<int>::iterator itLo=lineNumber->begin(),
  itLoEnd=lineNumber->end();


string str;
string temp; 
for ( ; it!=itEnd ;it++,itLo++ )
{
 str=*it;
 temp="";

 int strLength=str.length();

 for (int i=0;i<strLength;i++)
 {
 if ((str[i]<='9'&&str[i]>='0') || 
 (str[i]<='z' &&str[i]>='a')|| (str[i]<='Z'&&str[i]>='A') )
 {
 temp+=str[i];
 }


 else
 {
 
 if (temp!="")
 {
signalWord->push_back(temp);
signalNumber->push_back(*itLo);
temp="";
 }
 if (str[i]!='' && str[i]!=' ')
 {
 signalWord->push_back(temp); 
 signalNumber->push_back(*itLo);
 }
     
 }


 }

 if (temp!="")
 {
 signalWord->push_back(temp); 
 signalNumber->push_back(*itLo);
 }

}

signalLocation->first=signalNumber;
signalLocation->second=signalWord;

}





//main.cpp
#include "baseFileFunction.h"
#include "handlefile.h"
#include <iostream>

using namespace std;

int main()
{
/*FileFunction basefile;
basefile.retrievedFile();*/

handleFile han;
han.retrievedSourceFile();
return 0;
}


错误：
1>  main.cpp
1>  handlefile.cpp
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(13): error C2512: 'handleFile::FileFunction' : no appropriate default constructor available 
 
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(14): error C2512: 'handleFile::FileFunction' : no appropriate default constructor available
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(15): error C2512: 'handleFile::FileFunction' : no appropriate default constructor available
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(20): warning C4150: deletion of pointer to incomplete type 'handleFile::FileFunction'; no destructor called
1>          d:\code\completecode\basefilefunction\basefilefunction\handlefile.h(10) : see declaration of 'handleFile::FileFunction'
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(21): warning C4150: deletion of pointer to incomplete type 'handleFile::FileFunction'; no destructor called
1>          d:\code\completecode\basefilefunction\basefilefunction\handlefile.h(10) : see declaration of 'handleFile::FileFunction'
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(22): warning C4150: deletion of pointer to incomplete type 'handleFile::FileFunction'; no destructor called
1>          d:\code\completecode\basefilefunction\basefilefunction\handlefile.h(10) : see declaration of 'handleFile::FileFunction'
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(27): error C2027: use of undefined type 'handleFile::FileFunction'
1>          d:\code\completecode\basefilefunction\basefilefunction\handlefile.h(10) : see declaration of 'handleFile::FileFunction'
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(27): error C2227: left of '->retrievedFile' must point to class/struct/union/generic type
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(32): error C2027: use of undefined type 'handleFile::FileFunction'
1>          d:\code\completecode\basefilefunction\basefilefunction\handlefile.h(10) : see declaration of 'handleFile::FileFunction'
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(32): error C2227: left of '->retrievedFile' must point to class/struct/union/generic type
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(37): error C2027: use of undefined type 'handleFile::FileFunction'
1>          d:\code\completecode\basefilefunction\basefilefunction\handlefile.h(10) : see declaration of 'handleFile::FileFunction'
1>d:\code\completecode\basefilefunction\basefilefunction\handlefile.cpp(37): error C2227: left of '->retrievedFile' must point to class/struct/union/generic type
1>  baseFileFunction.cpp
1>  Generating Code...
1>
1>Build FAILED.

[解决办法]
class FileFunction;声明一个嵌套类；还没有定义； 这个是嵌套类的前置声明；
这个类的完整声明是 class handleFile::FileFunction；

friend class handleFile;声明一个外部类是友元类