Re: missing function

Re: missing function

[Dara Hazeghi]

Hello,

template definitions must be present to their callers,
ie when gcc finishes preprocessing prova91.cpp, it
must see the contents of prova92.cpp (where you define
prova).

The conventional method of doing this is a bit weird,
but something like this:
change prova92.h to read:

#ifndef _prova92_h
#define _prova92_h
template <class T> void prova(T k);

#include "prova92.cpp"
#endif

To compile, you just compile prova91.cpp, and
everything gets pulled in as needed.

Hope that helps,

Dara

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missing function

[codaditasso]

Hello
I have write the following files:

prova91.cpp:

1 #include "prova92.h"
2
3 int
4 main(){
5      int k=1;
6      prova(k);
7      return 0;
8 };

prova92.h:

1 template <class T> void prova(T k);

prova92.cpp:

1 #include <iostream>
2 #include "prova92.h"
3 using namespace std;
4 template <class T> void
5 prova(T k){
6           cout<<k<<"\n";
7 };

 And the i have digit the following command to compile the program:

bash-2.05b# g++ -c prova91.cpp
bash-2.05b# g++ -c prova92.cpp
bash-2.05b# g++ -o prova9 prova91.o prova92.o

But i have obtained the following error from the last command:

prova91.o(.text+0x1e): In function `main':
: undefined reference to `void prova<int>(int)'
collect2: ld returned 1 exit status

What's the problem ? Maybe the template function and class must be written
only in the header files?

Greetings from Pinzi

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