Template + Multifile

This is a discussion on Template + Multifile within the C++ Programming forums, part of the General Programming Boards category; Hi friends I wrote some program with structue like this : but it does'nt work , and I don't know ...

  1. #1
    Registered User
    Join Date
    Aug 2006
    Posts
    5

    Template + Multifile

    Hi friends
    I wrote some program with structue like this :
    but it does'nt work , and I don't know why
    please help me , Thank you

    main.cpp
    Code:
    #include "Unit10.h"
    #include <conio.h>
    
    int main(int argc, char* argv[])
    {
    	tst<int> obj(10);
    	obj.show();
    	getch();
    	return 0;
    }
    Implement (Unit9.cpp) :
    Code:
    #include <iostream>
    using std::cout ;
    
    #include "Unit10.h"
    template <typename T>
    void tst<T>::show()
    {
    	cout << i ;
    }
    and interface:
    Code:
    #ifndef Unit10H
    #define Unit10H
    template <typename T>
    class tst
    {
    	public :
    		T i ;
    		tst<T>(T n=0) : i(n) {}
    		void show() ;
    
    };
    #endif
    error :
    Code:
    [Linker Error] Error: Unresolved external 'tst<int>::show()' referenced from C:\UNIT9.OBJ
    and I checked it in C++Builder , dm , DevC++
    but the result of all of them were similar.
    Last edited by Mehdi; 11-02-2006 at 06:15 AM.

  2. #2
    erstwhile
    Join Date
    Jan 2002
    Posts
    2,227
    Most compilers don't support template function defintions in a separate file (the two you've mentioned definitely don't). Move the template function definition into the header file, Unit10.h

    As an aside, take a look at this faq, too.
    CProgramming FAQ
    Caution: this person may be a carrier of the misinformation virus.

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