Wont Compile In VS.NET

This is a discussion on Wont Compile In VS.NET within the C++ Programming forums, part of the General Programming Boards category; Code: //stdafx.h #pragma once #define WIN32_LEAN_AND_MEAN // Exclude rarely-used stuff from Windows headers #include <stdio.h> #include <tchar.h> #include <iostream.h> #include ...

  1. #1
    Banned Troll_King's Avatar
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    Wont Compile In VS.NET

    Code:
    //stdafx.h
    #pragma once
    #define WIN32_LEAN_AND_MEAN	// Exclude rarely-used stuff from Windows headers
    #include <stdio.h>
    #include <tchar.h>
    #include <iostream.h>
    #include <stdlib.h>
    #include <string.h>
    /************************************/
    
    //Queue.h
    #ifndef GUARD_CQueue_H
    #define GUARD_CQueue_H
    
    template <class T>
    class CQueue
    {
    public:
    		//exception classes
    		class CqueueFull{};
    		class CqueueEmpty {};
    private:
    		typedef struct node_s 
    		{
    			T item;
    			node_s * next;
    			node_s (T x) { item = x; next = NULL;}
    		}LList;
    
    		LList *head, *tail;
    		int max_size;
    		int current_size;
    
    public:
    		CQueue(int iSize);
    		inline bool empty() const { return head == NULL; }
    		void In(T x);
    		T Out();
    };
    
    /******************************/
    //Queue.cpp
    #include "stdafx.h"
    #include "CQueue.h"
    
    template<class T>
    CQueue<T>::CQueue(int iSize) 
    { 
    	max_size = iSize;
    	current_size = 0;
    	head = NULL;
    }
    
    template<class T>
    T CQueue<T>::Out()
    {
    	if(!empty())
    	{
    		T v = head->item; 
    		LList *t = head->next;
    		delete head;
    		head = t;
    		return v;
    	}else
    	{
    		throw CqueueEmpty();
    	}
    }
    
    template <class T> 
    void CQueue<T>::In(T x) 
    {	
    		if( current_size < max_size)
    		{
    			current_size ++;
    			LList *t = tail;
    			tail = new node_s(x);
    			if(head == NULL) 
    			{
    				head = tail;
    			}else
    			{
    				t->next = tail;
    			}
    		}else
    		{
    			throw CqueueFull();
    		}
    }
    /*******************************/
    //Main.cpp
    #include "stdafx.h"
    #include "CQueue.h"
    
    int main()
    {
    	try
    	{
    
    		CQueue<double> Q(16);
    		Q.In(12.3);
    		Q.In(45.2);
    		Q.In(67.69);
    		Q.In(8.98);
    
    
    		cout << "Out: " << Q.Out() << endl;
    		cout << "OUt: " << Q.Out() << endl;
    		cout << "OUt: " << Q.Out() << endl;
    		cout << "OUt: " << Q.Out() << endl;
    	}
    	catch(CQueue<double>::CqueueFull)
    	{
    		cout << "Queue is full." << endl;
    	}
    	catch(CQueue<double>::CqueueEmpty)
    	{
    		cout << "Queue is Empty." << endl;
    	}
    
    	return 0;
    }
    What is the error? I get 3 'unresolved external' errors!

  2. #2
    Banned Troll_King's Avatar
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    I said the files were named Queue.h, Queue.cpp, but I meant CQueue. Yup I get those unresolved external errors. How do I fix it?

  3. #3
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    These are the actual error messages:
    Code:
    c:\Program Files\Microsoft Visual Studio.NET\Vc7\include\useoldio.h(29): warning C4995: '_OLD_IOSTREAMS_ARE_DEPRECATED': name was marked as #pragma deprecated
    BonusLab error LNK2019: unresolved external symbol "public: double __thiscall CQueue<double>::Out(void)" (?Out@?$CQueue@N@@QAENXZ) referenced in function _main
    BonusLab error LNK2019: unresolved external symbol "public: void __thiscall CQueue<double>::In(double)" (?In@?$CQueue@N@@QAEXN@Z) referenced in function _main
    BonusLab error LNK2019: unresolved external symbol "public: __thiscall CQueue<double>::CQueue<double>(int)" (??0?$CQueue@N@@QAE@H@Z) referenced in function _main
    BonusLab fatal error LNK1120: 3 unresolved externals
    BonusLab is just the project workspace that I used to write this code.

  4. #4
    zen
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    In main.cpp you'll need to change

    #include "CQueue.h"

    to

    #include "CQueue.cpp"
    zen

  5. #5
    Banned Troll_King's Avatar
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    Damn, that worked. And I already reported this to Microsoft!

  6. #6
    Skunkmeister Stoned_Coder's Avatar
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    why is that necessary zen? surely including the header file is the 'right' thing to do?
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

  7. #7
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    I just posed that question to zen too.

  8. #8
    zen
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    Microsofts compliers don't seem to treat template classes as part of the project when they are in different files, so you have to make sure everythings included in the main file.
    zen

  9. #9
    junior member mix0matt's Avatar
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    zen i have a question?

    i was taught that method definitions in a class template must be in the same file as the class definition regardless of complier. So i've always done it this way. Are there compilers that will compile a class template with the method definitions in a separate file?
    THIS IS NOT JUST A CHRONICLING OF THINGS WE HAVE DONE IN THE PAST BUT OUR RISE TO POWER.

  10. #10
    Skunkmeister Stoned_Coder's Avatar
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    I reckon that code will compile on most non-microsoft compilers.....

    unfortuneately i only have msvc installed!
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

  11. #11
    zen
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    i was taught that method definitions in a class template must be in the same file as the class definition regardless of complier. So i've always done it this way. Are there compilers that will compile a class template with the method definitions in a separate file?
    You could be partially right there, as I had linker errors trying it with Dev C++. However you don't have to have them in the same file, just ensure that all files are included in the file that creates an instance of the template.
    zen

  12. #12
    Blank
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    I said the files were named Queue.h, Queue.cpp, but I meant CQueue. Yup I get those unresolved external errors. How do I fix it?
    What I usually do is to have
    Queue.h #include Queue.cpp at the bottom the
    header file. Queue.cpp is never compiled and doesn't #include
    Queue.h, this basically just keeps the implementation out of the header file.

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