On Wed, Jan 07, 2004 at 12:37:53PM +0100, wrote:
> I tried to use a simple template in a class, and it
> worked when all the definition where in the same file.
> But when I separated the code in two cpp files, I get
> a linker error, and I couldn't firgure out how to
> compile it.
> I tried the following commands:
> g++ -c test.cpp
> g++ -c test1.cpp
> g++ -o test test.o test1.o
>
> The first two worked, but i got the linker error at
> the last one.
> I attached the files to these mail.
> Thank you.
You can't seperate a template class and its constructor like this.
A template class with all its methods must be fully available at
instantiation time (as of now -- this may change in the future when the
`export' keyword is supported).
Usually you do it like this:
// test.h
#ifndef TEST_H
#define TEST_H
template <class T> foo {
...
test();
};
#include <test.tcc>
#endif // TEST_H
----------------------------------------------------------------------
// test.tcc
// (gets included from test.h)
template <class T> test<T>::test( ) {
}
----------------------------------------------------------------------
// test.cc
#include "test.h"
...
----------------------------------------------------------------------
Of course, you may choose another suffix instead of .tcc for your
template implementation files, but that's the same suffix libstdc++ uses
for these files.
HTH
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