Re: Defining template class methods outside class definition

[Paul Pluzhnikov]

Martin Magnusson <martin@-xx-blecket-xx-.org> writes:

> I have a templated class, and I want to keep the implementation in a
> separate file, and not in the header file. 

This will not work with 'g++' and most other C++ compilers.

> Shouldn't the code below work?

No, because it has a syntax error.

Correct code is:

  template<int N> 
  vertex<N>::vertex() { [...] }

However, after you compile the fixed test.cpp, you'll end up with
an empty object file: 'g++' does not instantiate templates until
they are used (which is why they should be in the header file).

Cheers,
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