Error: no member named 'whatever'

This is a discussion on Error: no member named 'whatever' within the C++ Programming forums, part of the General Programming Boards category; ? It appears that your user is supposed to type the information in, yes? So ... let the user type ...

  1. #16
    and the Hat of Guessing tabstop's Avatar
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    ?

    It appears that your user is supposed to type the information in, yes? So ... let the user type it in.

  2. #17
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    Yes, the user enters the information. But the user enters it in one of the following formats:

    For a volunteer,
    type/firstName/lastName/employeeId

    For a full time employee,
    type/firstName/lastName/emloyeeId/rate/bonus

    For an hourly employee,
    type/firstName/lastName/emloyeeId/rate/hoursWorked

    So we have to parse the information from the entered string and tokenize it. I have already done this, in the function below. I just don't know how to access the variables that I have declared in StaffMemberParser.h from my main function.

    Code:
    // StaffMemberParser.h
    
    #include <stdio.h>
    #include <iostream>
    #include <sstream>
    #include <string>
    #include <stdexcept>
    
    // protections 
    #ifndef StaffMemberParser_H
    #define StaffMemberParser_H
    
    using namespace std;
    
    class BadConversion : public std::runtime_error 
    {
     public:
       BadConversion(const std::string& s)
         : std::runtime_error(s)
         { }
    };
     
    inline double convertToDouble(const std::string& s)
    {
       std::istringstream i(s);
       double x;
       if (!(i >> x))
         throw BadConversion("convertToDouble(\"" + s + "\")");
       return x;
    } 
    
    inline int convertToInt(const std::string& s)
    {
       std::istringstream i(s);
       int x;
       if (!(i >> x))
         throw BadConversion("convertToInt(\"" + s + "\")");
       return x;
    } 
    
    class StaffMemberParser
    {
          static StaffMember * parseStringToMember(string lineToParse)
          {
                 const char *ptr = lineToParse.c_str();
                 char field [100];
                 int n, i = 0, hoursWorked;
                 string type, firstName, lastName, employeeId;
                 double rate, bonus;
                 
                 while ( sscanf(ptr, "%31[^/]%n", field, &n) == 1 )
                 {
                      switch (i++)
                      {
                             case 0: type = field; break;
                             case 1: firstName = field; break;
                             case 2: lastName = field; break;
                             case 3: employeeId = field; break;
                             case 4:
                                  if ( type == "Volunteer" )
                                  {
                                       // nothing to do
                                  }
                                  else if ( type == "HourlyEmployee" )
                                  {
                                       rate = convertToDouble(field);
                                  }
                                  else if ( type == "FullTimeEmployee" )
                                  {
                                       rate = convertToDouble(field);
                                  }
                                  break;
                             case 5:
                                  if ( type == "Volunteer" )
                                  {
                                       // nothing to do
                                  }
                                  else if ( type == "HourlyEmployee" )
                                  {
                                       hoursWorked = convertToInt(field);
                                  }
                                  else if ( type == "FullTimeEmployee" )
                                  {
                                       bonus = convertToDouble(field);
                                  }
                                  break;
                             default: break;
                      }
                      ptr += n;
                      if ( *ptr != '/' )
                      {
                           break;  // didn't find an expected delimiter
                      }
                      while ( *ptr == '/' )      
                      { 
                           ++ptr;  // skip the delimiter     
                      }
                 }  
          }
    };
    
    #endif

  3. #18
    and the Hat of Guessing tabstop's Avatar
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    I just don't know how to access the variables that I have declared in StaffMemberParser.h from my main function.
    If such a thing was necessary or desirable, that could be a problem. Since it is neither necessary nor desirable, there's no problem.
    Code:
    Volunteer *new_guy = new Volunteer(firstName, lastName, employeeId);
    FullTime *new_guy = new FullTime(firstName, lastName, employeeId, rate, bonus);
    et cetera.

  4. #19
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    Okay, I tried that...but I am still getting some errors. They are as follows:

    45 Assignment7.cpp expected primary-expression before '.' token
    46 Assignment7.cpp 'struct std::string' has no member named 'type'
    48 Assignment7.cpp `Volunteer' undeclared (first use this function)
    48 Assignment7.cpp `firstName' undeclared (first use this function)
    and so on with lastName and memberId.

    So how do I tell the code that those variables are part of the included files so that it doesn't think they are undeclared? Also, what do those first two lines mean? Here is my code right now:

    Code:
    // Assignment #: 7
    //         Name: 
    // EmailAddress:
    //  Description: It displays a menu of choices
    //               (add volunteers, full time employees, or hourly employees,
    //               compute their pay, search a member, list members,
    //               quit, display menu) to a user.
    //               Then it performs the chosen task. It will keep asking a user 
    //               to enter the next choice until the choice of 'Q' (Quit) is
    //               entered.
    
    #include <iostream>
    #include <string>
    #include <cstdlib>
    #include <vector>
    #include "StaffMember.h"
    #include "StaffMemberParser.h"
    
    using namespace std;
    
    void printMenu();
    
    int main()
    {
    	char input1;
    	string inputInfo;
    	bool operation;
    
    	vector<StaffMember *> memberList;
    
    
    	printMenu();     // print out menu
    
    
    	do
    	{
    		cout << "What action would you like to perform?" << endl;
    		cin >> input1;
    
    		switch (input1)
    		{
    		case 'A':   //Add Member
    			cout << "Please enter a member information to add:\n";
    			cin >> inputInfo;
    			StaffMemberParser.parseStringToMember(inputInfo);
                if ( inputInfo.type == "Volunteer" )
                {
                    Volunteer *new_guy = new Volunteer(firstName, lastName, employeeId);
                }
                else if ( type == "HourlyEmployee" )
                {
                    
                }
                else if ( type == "FullTimeEmployee" )
                {
                    FullTimeEmployee * fulltime1 = new FullTimeEmployee;
                }
    			break;
    		case 'C':   //Compute Pay
    		    for (int j=0; j < memberList.size(); j++)
    			{
                     memberList.at(j)->computePay();
    		    }
                cout << "pay computed\n";
    			break;
    		case 'D':   //Search for Member
    			cout << "Please enter a memberID to search:\n";
    			cin >> inputInfo;
    			operation = false;
    			
                for (int j=0; j < memberList.size(); j++)
    			{
    			     if (inputInfo == memberList.at(j)->getMemberId())
    			     {
                           operation = true;
                     }
                     else
                     {
                           operation = false;
                     }
    		    }
    			if (operation == true)
    				cout << "member found\n";
    			else
    				cout << "member not found\n";
    			break;
    		case 'L':   //List Members
                 if (sizeof(memberList) == 0)
                 {
                     cout << "no member\n" << endl;
                 }
                 else 
                 {
                     for (int j=0; j < memberList.size(); j++)
    			     {
    				     memberList.at(j)->printInfo();
    		         }   
                 }
    			 break;
    		case 'Q':   //Quit
    			for (int j=0; j < memberList.size(); j++)
    			{
    				delete memberList.at(j);
    			}
    			break;
    		case '?':   //Display Menu
    			printMenu();
    			break;
    		default:
    			cout << "Unknown action\n";
    			break;
    		}
    
    	} while (input1 != 'Q' && input1 != 'q'); // stop the loop when Q is read
    
    }
    
    /** The method printMenu displays the menu to a user **/
    void printMenu()
    {
    	cout << "Choice\t\tAction\n"; 
    	cout << "------\t\t------\n"; 
    	cout << "A\t\tAdd Member\n"; 
    	cout << "C\t\tCompute Pay\n"; 
    	cout << "D\t\tSearch for Member\n"; 
    	cout << "L\t\tList Members\n"; 
    	cout << "Q\t\tQuit\n"; 
    	cout << "?\t\tDisplay Help\n\n";
    }

  5. #20
    and the Hat of Guessing tabstop's Avatar
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    Hello McFly?
    Code:
    static StaffMember * parseStringToMember(string lineToParse)

  6. #21
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    Okay..when I change that line, I get the following error on it:

    45 Assignment7.cpp cannot convert `std::string' to `StaffMember*' in initialization

    I am still also getting the other errors, about Volunteer and newguy not being initialized. What do I do about that?

  7. #22
    and the Hat of Guessing tabstop's Avatar
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    Guh.

    Since your parseStringToMember function returns a pointer to your new StaffMember, you must create the new not-a-StaffMember-but-one-of-the-derived-classes in the parseStringToMember function and not anywhere else.

  8. #23
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    Okay. So I did that, changing my parseStringToMember function so that it returns an object of one of the child classes, I think. But I am still getting some errors, and they are basically the same as before. Here are the errors I am getting:

    45 Assignment7.cpp cannot convert `std::string' to `StaffMember*' in initialization
    63 StaffMemberParser.h `Volunteer' undeclared (first use this function)
    63 StaffMemberParser.h `vol1' undeclared (first use this function)
    63 StaffMemberParser.h `Volunteer' has not been declared
    and so on for each of the variables.

    And then I get this error multiple times:
    47 Assignment7.cpp jump to case label
    45 Assignment7.cpp crosses initialization of `StaffMember*parseStringToMember'


    Here are the relevant files, Assignment7.cpp and StaffMemberParser.h, with the appropriate lines being labeled:

    Code:
    // Assignment #: 7
    //         Name: 
    // EmailAddress:
    //  Description: It displays a menu of choices
    //               (add volunteers, full time employees, or hourly employees,
    //               compute their pay, search a member, list members,
    //               quit, display menu) to a user.
    //               Then it performs the chosen task. It will keep asking a user 
    //               to enter the next choice until the choice of 'Q' (Quit) is
    //               entered.
    
    #include <iostream>
    #include <string>
    #include <cstdlib>
    #include <vector>
    #include "StaffMember.h"
    #include "StaffMemberParser.h"
    
    using namespace std;
    
    void printMenu();
    
    int main()
    {
    	char input1;
    	string inputInfo;
    	bool operation;
    
    	vector<StaffMember *> memberList;
    
    
    	printMenu();     // print out menu
    
    
    	do
    	{
    		cout << "What action would you like to perform?" << endl;
    		cin >> input1;
    
    		switch (input1)
    		{
    		case 'A':   //Add Member
    			cout << "Please enter a member information to add:\n";
    			cin >> inputInfo;
    			StaffMember * parseStringToMember(inputInfo); // this is line 45
    			break;
    		case 'C':   //Compute Pay
    		    for (int j=0; j < memberList.size(); j++)
    			{
                     memberList.at(j)->computePay();
    		    }
                cout << "pay computed\n";
    			break;
    		case 'D':   //Search for Member
    			cout << "Please enter a memberID to search:\n";
    			cin >> inputInfo;
    			operation = false;
    			
                for (int j=0; j < memberList.size(); j++)
    			{
    			     if (inputInfo == memberList.at(j)->getMemberId())
    			     {
                           operation = true;
                     }
                     else
                     {
                           operation = false;
                     }
    		    }
    			if (operation == true)
    				cout << "member found\n";
    			else
    				cout << "member not found\n";
    			break;
    		}
    
    	} while (input1 != 'Q' && input1 != 'q'); // stop the loop when Q is read
    
    }
    Code:
    // StaffMemberParser.h
    
    #include <stdio.h>
    #include <iostream>
    #include <sstream>
    #include <string>
    #include <stdexcept>
    #include "StaffMember.h"
    
    // protections 
    #ifndef StaffMemberParser_H
    #define StaffMemberParser_H
    
    using namespace std;
    
    class BadConversion : public std::runtime_error 
    {
     public:
       BadConversion(const std::string& s)
         : std::runtime_error(s)
         { }
    };
     
    inline double convertToDouble(const std::string& s)
    {
       std::istringstream i(s);
       double x;
       if (!(i >> x))
         throw BadConversion("convertToDouble(\"" + s + "\")");
       return x;
    } 
    
    inline int convertToInt(const std::string& s)
    {
       std::istringstream i(s);
       int x;
       if (!(i >> x))
         throw BadConversion("convertToInt(\"" + s + "\")");
       return x;
    } 
    
    class StaffMemberParser
    {
          static StaffMember * parseStringToMember(string lineToParse)
          {
                 const char *ptr = lineToParse.c_str();
                 char field [100];
                 int n, i = 0, hoursWorked;
                 string type, firstName, lastName, employeeId;
                 double rate, bonus;
                 
                 while ( sscanf(ptr, "%31[^/]%n", field, &n) == 1 )
                 {
                      switch (i++)
                      {
                             case 0: type = field; break;
                             case 1: firstName = field; break;
                             case 2: lastName = field; break;
                             case 3: employeeId = field; break;
                             case 4:
                                  if ( type == "Volunteer" )
                                  {
                                       Volunteer * vol1 = new Volunteer(firstName, lastName, employeeId); // this is line 63
                                       return vol1;
                                  }
                                  else if ( type == "HourlyEmployee" )
                                  {
                                       rate = convertToDouble(field);
                                  }
                                  else if ( type == "FullTimeEmployee" )
                                  {
                                       rate = convertToDouble(field);
                                  }
                                  break;
                             case 5:
                                  if ( type == "Volunteer" )
                                  {
                                       // nothing to do
                                  }
                                  else if ( type == "HourlyEmployee" )
                                  {
                                       hoursWorked = convertToInt(field);
                                       HourlyEmployee * hourly1 = new HourlyEmployee(firstName, lastName, employeeId, rate, hoursWorked);
                                       return hourly1;
                                  }
                                  else if ( type == "FullTimeEmployee" )
                                  {
                                       bonus = convertToDouble(field);
                                       FullTimeEmployee *fullTime1 = new FullTimeEmployee(firstName, lastName, employeeId, rate, bonus);
                                       return fullTime1;
                                  }
                                  break;
                             default: break;
                      }
                      ptr += n;
                      if ( *ptr != '/' )
                      {
                           break;  // didn't find an expected delimiter
                      }
                      while ( *ptr == '/' )      
                      { 
                           ++ptr;  // skip the delimiter     
                      }
                 }  
          }
    };
    
    #endif

  9. #24
    and the Hat of Guessing tabstop's Avatar
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    Code:
    StaffMember * parseStringToMember(inputInfo);
    You want to call a function, not declare a variable.

    And I don't think I was thinking clearly: I'm pretty sure, at the top, you want
    Code:
    StaffMember * newguy;
    (Notice how the type means we're declaring a variable?) Then I'm pretty sure you can do
    Code:
    newguy = new Whatever_type(appropriate things here);
    rather than a separate pointer for each different type.

  10. #25
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    Quote Originally Posted by tabstop View Post
    Code:
    StaffMember * parseStringToMember(inputInfo);
    You want to call a function, not declare a variable.
    Okay, so like this, maybe?

    Code:
    parseStringToMember(inputInfo);
    I am getting an error at that line, though, so I'm guessing that is not right. Here is the error:

    45 Assignment7.cpp `parseStringToMember' undeclared (first use this function)


    Quote Originally Posted by tabstop View Post
    And I don't think I was thinking clearly: I'm pretty sure, at the top, you want
    Code:
    StaffMember * newguy;
    (Notice how the type means we're declaring a variable?) Then I'm pretty sure you can do
    Code:
    newguy = new Whatever_type(appropriate things here);
    rather than a separate pointer for each different type.
    Okay, that makes sense. I think I get that. I am still getting a few errors, though many many less. I am getting these errors:

    64 StaffMemberParser.h `Volunteer' has not been declared
    84 StaffMemberParser.h `HourlyEmployee' has not been declared
    90 StaffMemberParser.h `FullTimeEmployee' has not been declared

    on the lines where I use the code you suggested above, though.

    Here are the updated versions of my code:

    Code:
    // Assignment #: 7
    //         Name: 
    // EmailAddress:
    //  Description: It displays a menu of choices
    //               (add volunteers, full time employees, or hourly employees,
    //               compute their pay, search a member, list members,
    //               quit, display menu) to a user.
    //               Then it performs the chosen task. It will keep asking a user 
    //               to enter the next choice until the choice of 'Q' (Quit) is
    //               entered.
    
    #include <iostream>
    #include <string>
    #include <cstdlib>
    #include <vector>
    #include "StaffMember.h"
    #include "StaffMemberParser.h"
    
    using namespace std;
    
    void printMenu();
    
    int main()
    {
    	char input1;
    	string inputInfo;
    	bool operation;
    
    	vector<StaffMember *> memberList;
    
    
    	printMenu();     // print out menu
    
    
    	do
    	{
    		cout << "What action would you like to perform?" << endl;
    		cin >> input1;
    
    		switch (input1)
    		{
    		case 'A':   //Add Member
    			cout << "Please enter a member information to add:\n";
    			cin >> inputInfo;
    			parseStringToMember(inputInfo); 
    			break;
    		case 'C':   //Compute Pay
    		    for (int j=0; j < memberList.size(); j++)
    			{
                     memberList.at(j)->computePay();
    		    }
                cout << "pay computed\n";
    			break;
    		default:
    			cout << "Unknown action\n";
    			break;
    		}
    
    	} while (input1 != 'Q' && input1 != 'q'); // stop the loop when Q is read
    
    }
    Code:
    // StaffMemberParser.h
    
    #include <stdio.h>
    #include <iostream>
    #include <sstream>
    #include <string>
    #include <stdexcept>
    #include "StaffMember.h"
    
    // protections 
    #ifndef StaffMemberParser_H
    #define StaffMemberParser_H
    
    using namespace std;
    
    class BadConversion : public std::runtime_error 
    {
     public:
       BadConversion(const std::string& s)
         : std::runtime_error(s)
         { }
    };
     
    inline double convertToDouble(const std::string& s)
    {
       std::istringstream i(s);
       double x;
       if (!(i >> x))
         throw BadConversion("convertToDouble(\"" + s + "\")");
       return x;
    } 
    
    inline int convertToInt(const std::string& s)
    {
       std::istringstream i(s);
       int x;
       if (!(i >> x))
         throw BadConversion("convertToInt(\"" + s + "\")");
       return x;
    } 
    
    class StaffMemberParser
    {
          static StaffMember * parseStringToMember(string lineToParse)
          {
                 const char *ptr = lineToParse.c_str();
                 char field [100];
                 int n, i = 0, hoursWorked;
                 string type, firstName, lastName, employeeId;
                 double rate, bonus;
                 StaffMember * newMember;
                 
                 while ( sscanf(ptr, "%31[^/]%n", field, &n) == 1 )
                 {
                      switch (i++)
                      {
                             case 0: type = field; break;
                             case 1: firstName = field; break;
                             case 2: lastName = field; break;
                             case 3: employeeId = field; break;
                             case 4:
                                  if ( type == "Volunteer" )
                                  {
                                       newMember = new Volunteer(firstName, lastName, employeeId); // this is line 63
                                       return newMember;
                                  }
                                  else if ( type == "HourlyEmployee" )
                                  {
                                       rate = convertToDouble(field);
                                  }
                                  else if ( type == "FullTimeEmployee" )
                                  {
                                       rate = convertToDouble(field);
                                  }
                                  break;
                             case 5:
                                  if ( type == "Volunteer" )
                                  {
                                       // nothing to do
                                  }
                                  else if ( type == "HourlyEmployee" )
                                  {
                                       hoursWorked = convertToInt(field);
                                       newMember = new HourlyEmployee(firstName, lastName, employeeId, rate, hoursWorked);
                                       return newMember;
                                  }
                                  else if ( type == "FullTimeEmployee" )
                                  {
                                       bonus = convertToDouble(field);
                                       newMember = new FullTimeEmployee(firstName, lastName, employeeId, rate, bonus);
                                       return newMember;
                                  }
                                  break;
                             default: break;
                      }
                      ptr += n;
                      if ( *ptr != '/' )
                      {
                           break;  // didn't find an expected delimiter
                      }
                      while ( *ptr == '/' )      
                      { 
                           ++ptr;  // skip the delimiter     
                      }
                 }  
          }
    };
    
    #endif

  11. #26
    and the Hat of Guessing tabstop's Avatar
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    Quote Originally Posted by vileoxidation View Post
    Okay, so like this, maybe?

    Code:
    parseStringToMember(inputInfo);
    I am getting an error at that line, though, so I'm guessing that is not right. Here is the error:

    45 Assignment7.cpp `parseStringToMember' undeclared (first use this function)




    Okay, that makes sense. I think I get that. I am still getting a few errors, though many many less. I am getting these errors:

    64 StaffMemberParser.h `Volunteer' has not been declared
    84 StaffMemberParser.h `HourlyEmployee' has not been declared
    90 StaffMemberParser.h `FullTimeEmployee' has not been declared

    on the lines where I use the code you suggested above, though.

    Here are the updated versions of my code:
    So that's pretty clearly "lack of header files" if the types aren't there. Also your parseString function is not a free function, so you must use the scope::operator.

  12. #27
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    Quote Originally Posted by tabstop View Post
    So that's pretty clearly "lack of header files" if the types aren't there. Also your parseString function is not a free function, so you must use the scope::operator.
    Okay, duh, that all makes sense. When I included my other files, I found a few more errors, but I worked my way through all of them except one. Right now, the only error I am getting is about my parser class, and looks like this:

    48 StaffMemberParser.h `static StaffMember* StaffMemberParser:: parseStringToMember(std::string)' is private
    45 Assignment7.cpp within this context

    It is at this line:

    Code:
    StaffMemberParser::parseStringToMember(inputInfo);
    within the Assignment7.cpp file, and at the top of the parseStringToMember function in the StaffMemberParser.h file. Am I still not calling the function correctly?

    Thank you for all of the help, tabstop!!

  13. #28
    and the Hat of Guessing tabstop's Avatar
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    Did you read what the error message says? Read what it says.

  14. #29
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    Quote Originally Posted by tabstop View Post
    Did you read what the error message says? Read what it says.
    Right, I get that it is private...but I don't know how to get around that...? How do I call the function there if I can't call it because its private?

  15. #30
    and the Hat of Guessing tabstop's Avatar
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    Any function you intend to call cannot be private.

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