Compiling template function

[Nafai]

Hello I get linker error with files like these:

//function.h
template <typename T> void function(T*);

//function.cpp
template <typename T> void function(T* v)
{
...
}

// main.cpp
int main()
{
float v;
function(v);
}

g++ -o main main.o function.o <-- Linker error.

[Martin Gieseking]

Re: Compiling template function

> //function.h[color=blue]
> template <typename T> void function(T*);
>
> //function.cpp
> template <typename T> void function(T* v)
> {
> ...
> }
>
> // main.cpp
> int main()
> {
> float v;
> function(v);
> }[/color]


Move the implementation of the template function to the header file so the
compiler can see it in main.cpp.

Martin

[John Harrison]

Re: Compiling template function


"Nafai" <nafai3000@yaho o.es> wrote in message
news:h76ic.4672 616$uj6.1595953 2@telenews.tele line.es...[color=blue]
> Hello I get linker error with files like these:
>
> //function.h
> template <typename T> void function(T*);
>
> //function.cpp
> template <typename T> void function(T* v)
> {
> ...
> }
>[/color]

All template code should go in header files.

john

[JKop]

Re: Compiling template function

Nafai posted:
[color=blue]
> Hello I get linker error with files like these:
>
> //function.h
> template <typename T> void function(T*);
>
> //function.cpp
> template <typename T> void function(T* v)
> {
> ...
> }
>
> // main.cpp
> int main()
> {
> float v;
> function(v);
> }
>
> g++ -o main main.o function.o <-- Linker error.
>
>[/color]


Well, first thing that strikes me: Include "function.h " in
"main.cpp"!

#include "function.h "


Secondly, the entire template goes into the header file. Why? Because
it's dealt with entirely by the compiler, NOT the linker!

-JKop