Re: Linking Issue

From	Ruben Safir <ruben@mrbrklyn.com>
Newsgroups	comp.lang.c++
Subject	Re: Linking Issue
Date	2011-06-06 01:52 +0000
Organization	PANIX Public Access Internet and UNIX, NYC
Message-ID	<ishbst$c1k$2@reader1.panix.com> (permalink)
References	<ish9ur$c1k$1@reader1.panix.com>

Show all headers | View raw

http://www.nylxs.com/docs/quiz.tgz

On Mon, 06 Jun 2011 01:19:23 +0000, Ruben Safir wrote:

> I'm just not undertstanding what I'm doing wrong that the linker can't
> find my method function
> 
> I have this header file
> questionss.h
> 
> 
> #ifndef QUESTION
> #define QUESTION
> #include <cstdlib>
> #include <cstdio>
> #include <string>
> #include <vector>
> #include <iostream>
> #include <iomanip>
> #include <termios.h>
> 
> namespace Questions{
> 
>    class Question{
> 
>       public:
> 	 Question(std::string q, std::string a): quest(q), answer(a){ }
> 	 Question(){ }
> 	 Question(Question const &copy){
> 		 this->quest = copy.quest;
> 		 this->response = copy.response;
> 		 this->answer = copy.answer;
> 	 }
> 	 std::string quest;
> 	 std::string response;
> 	 std::string answer;
> 
> 
> 
> 
> 
> 
> 
>       private:
> 
> 
> 
>    };
> 
>    class Deck{
> 
>       public:
> 	 std::vector<Question> deck;
> 	 Deck(){
> 	    std::string home = std::getenv("HOME"); database = home +
> 	    "/quiz.db";
> 	    size = 0;
> 	 }
> 
> 
> 
> 	 void get_stack();
> 	 Question get_question();
> 	 void give_quiz();
> 	 void add_questions(Question &enter);
> 	 void add_database();
>     	 Question create_question(std::ostream &os = std::cout,
>     	 std::istream &in = std::cin );
> 
>       private:
> 	 int size;
> 	 std::string database;
> 
>    };
> 
> 
>    void menu(std::ostream &os = std::cout); void selection(Deck,
>    std::istream &in = std::cin);
> 
> 
> } //end of namespace Question
> 
> 
> #endif
> 
> 
> 
> this is a library file for questions ==> questions.cpp /*
>  *
>  =====================================================================================
>  *
>  *       Filename:  questions.cpp
>  *
>  *    Description:  Questions Class
>  *
>  *        Version:  1.0
>  *        Created:  06/05/2011 07:08:05 PM *       Revision:  none
>  *       Compiler:  gcc
>  *
>  *         Author:  Ruben Safir (), ruben@mrbrklyn.com *        Company:
>   NYLXS
>  *
>  *
>  =====================================================================================
>  */
> 
> #include <cstdlib>
> #include <cstdio>
> #include <string>
> #include <vector>
> #include <iostream>
> #include <iomanip>
> #include <termios.h>
> #include "questions.h"
> 
> namespace Questions{
> 
>    Question Deck::create_question(std::ostream &os , std::istream &in ){
>       struct termios stored_settings;
>       struct termios new_settings;
>       std::string input_q, input_a;
>       char keystroke;
> 
> 
>       os << "Please Enter your question below \n Enter <esc> when
>       finished" << std::endl; os <<
>       "=================================================================="
>       << std::endl;
> 
>       tcgetattr(0,&stored_settings);
> 
>       new_settings = stored_settings;
> 
>       /* Disable canonical mode, and set buffer size to 1 byte */
>       new_settings.c_lflag &= (~ICANON);
>       new_settings.c_cc[VTIME] = 0;
>       new_settings.c_cc[VMIN] = 1;
> 
>       tcsetattr(0,TCSANOW,&new_settings);
> 
>       while( (keystroke = getchar()) ){
> 	 if (keystroke == 27)
> 	    break;
> 	 input_q += keystroke;
>       }
>       os << "Please Enter your answer below \n Enter <esc> when
>       finished" << std::endl; os <<
>       "=================================================================="
>       << std::endl;
> 
>       while( (keystroke = getchar()) ){
> 	 if (keystroke == 27)
> 	    break;
> 	 input_a += keystroke;
>       }
> 
>       Question quest(input_q, input_a);
> 
> 
> 
> 
>       tcsetattr(0,TCSANOW,&stored_settings); return quest;
>    }
> 
>    void menu(std::ostream &os){
>       os << "Welcome the the C++ Quiz" << "\n\n\n\n" << std::endl;
>       std::string tmp = " \n "
> 	 "Select from one of the following: \n\n" "a) Insert Question and
> 	 Answer into the database\n" "b) Read 25 Questions and run
> 	 Quiz\n\n\nResponse==> ";
> 
>       os << tmp << std::endl;
> 
>    }
> 
> 
>    void selection(Deck &stack, std::istream &is = std::cin) {
>       char choice;
>       Question tmp;
>       if(is >> choice){
> 
> 	 switch ( choice ) {
> 	    case 'a':
> 	       tmp = stack.create_question();
> 	       stack.add_questions(tmp);
> 	       break;
> 
> 	    case 'b':
> 	       break;
> 
> 	    default:
> 	       break;
> 	 }				/* -----  end switch  ----- */
>       }
>    }
> 
> }         /* End of Namespace Questions */
> 
> 
> And this is the main program
> 
> #include <iostream>
> #include "questions.h"
> #include <string>
> #include <vector>
> 
> int main(int argv, char *argc[]){
> 
>   Questions::Deck stack;
> 
>   Questions::menu();
>   Questions::selection(stack);
> 
>   return 0;
> }
> 
> and this is the makefile
> CXX:=g++
> CXXFLAGS:=-Wall -ggdb -pg
> LDFLAGS:= -pg
> 
> quiz : quiz.o questions.o
> 	$(CXX) $(LDFLAGS) -o quiz quiz.o questions.o
> 
> quiz.o : quiz.cpp questions.h
> 	$(CXX) $(LDFLAGS) -c quiz.cpp
> 
> questions.o : questions.cpp questions.h
> 	$(CXX) $(LDFLAGS) -c questions.cpp
> 
> 
> 
> include make.deps
> make.deps: *.cpp; ${CXX} ${CXXFLAGS} -M *.cpp >$@
> 
> 
> 
> 
> when I compile it I'm getting a linker error
> 
> 
> :!make  2>&1| tee /tmp/vo1mDhy/8
> g++ -pg -o quiz quiz.o questions.o
> quiz.o: In function `main':
> quiz.cpp:(.text+0x4b): undefined reference to
> `Questions::selection(Questions::Deck, std::basic_istream<char,
> std::char_traits<char> >&)' questions.o: In function
> `Questions::selection(Questions::Deck&, std::basic_istream<char,
> std::char_traits<char> >&)': questions.cpp:(.text+0x468): undefined
> reference to `Questions::Deck::add_questions(Questions::Question&)'
> collect2: ld returned 1 exit status
> make: *** [quiz] Error 1
> (1 of 7): g++ -pg -o quiz quiz.o questions.o
> 
> 
> 
> The function is sitting there as plain as daylight
>   class Deck{
> 
>       public:
> 	 std::vector<Question> deck;
> 	 Deck(){
> 	    std::string home = std::getenv("HOME"); database = home +
> 	    "/quiz.db";
> 	    size = 0;
> 	 }
> 
> 
> 
> 	 void get_stack();
> 	 Question get_question();
> 	 void give_quiz();
> 	 void add_questions(Question &enter); <<==========

Thread

Linking Issue Ruben Safir <ruben@mrbrklyn.com> - 2011-06-06 01:19 +0000
  Re: Linking Issue "Paul" <pchristor@yahoo.co.uk> - 2011-06-06 02:51 +0100
    Re: Linking Issue red floyd <redfloyd@gmail.com> - 2011-06-06 10:16 -0700
      Re: Linking Issue "Paul" <pchristor@yahoo.co.uk> - 2011-06-06 20:22 +0100
      Re: Linking Issue Joshua Maurice <joshuamaurice@gmail.com> - 2011-06-06 14:06 -0700
  Re: Linking Issue Ruben Safir <ruben@mrbrklyn.com> - 2011-06-06 01:52 +0000
  Re: Linking Issue Joshua Maurice <joshuamaurice@gmail.com> - 2011-06-05 19:01 -0700
    Re: Linking Issue Ruben Safir <ruben@mrbrklyn.com> - 2011-06-06 02:18 +0000
      Re: Linking Issue "Paul" <pchristor@yahoo.co.uk> - 2011-06-06 03:24 +0100
  Re: Linking Issue red floyd <redfloyd@gmail.com> - 2011-06-06 10:18 -0700
    Re: Linking Issue ruben safir <ruben@mrbrklyn.com> - 2011-06-06 14:41 -0400
      Re: Linking Issue Paavo Helde <myfirstname@osa.pri.ee> - 2011-06-06 16:21 -0500

csiph-web