again on snippets

[Andrea Crotti <andrea.crotti.0@gmail.com>]

Still trying to make yasnippet even faster for c++ coding.

So suppose that I want to create a friend << operator

Something like:
--8<---------------cut here---------------start------------->8---
    friend ostream& operator<<(ostream& s, const PadCoordinate& c);
--8<---------------cut here---------------end--------------->8---
and this would be the beginning of the definition
--8<---------------cut here---------------start------------->8---
ostream& operator<<(ostream& s, const PadCoordinate& c)
{
--8<---------------cut here---------------end--------------->8---

so basically it's the same thing but in the implementation and header
file there are some differences, and it would be good to avoid
duplication.

Is there a variable (is-header-file) in cc-mode (can't find it)?

And what about the different styles, someone like

fun() {
}
someone
fun () {
}
or
fun()
{
}

and so on, maybe the snippet should output with the correct style given
in the configuration.