Date: Thu, 27 Dec 2007 22:35:13 +0100 From: =?UTF-8?B?VsOhY2xhdiBIYWlzbWFu?= <V.Haisman@sh.cvut.cz> To: "Heiko Wundram (Beenic)" <wundram@beenic.net> Cc: freebsd-hackers@freebsd.org Subject: Re: OT: C++ Template Functions Message-ID: <47741A91.1030001@sh.cvut.cz> In-Reply-To: <200712271621.12167.wundram@beenic.net> References: <200712271621.12167.wundram@beenic.net>
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Heiko Wundram (Beenic) wrote, On 27.12.2007 16:21:
> Hey all!
>=20
> I'm currently trying to implement (and use) a C++ member function templ=
ate,=20
> but GCC won't eat the code I feed it.
>=20
> The problem is most probably related to the fact that the group of memb=
er=20
> functions is only discriminated by return type (i.e., the template para=
meter=20
> defines the return type), not by parameter (which could be inferred).
>=20
> From what I gather, the C++ spec should allow the following code to wor=
k (the=20
> following is simplified from what I have, but pretty much the same=20
> syntactically):
>=20
> """
> template <typename U>
> class Test
> {
>=20
> public:
>=20
> template <typename V>
> V test()
> throw()
> {
> // Some stuff.
> }
>=20
> };
>=20
> template <typename U, typename V>
> void test2()
> throw()
> {
> Test<V>* x =3D new Test<V>();
> x->test<U>();
Change this to x->template test<U>(); For explanation see 14.2/4 of the y=
ear
2003 revision of the standard.
> delete x;
> }
>=20
> int main(int argc, char** argv)
> {
> test2<int,short>();
> }
> """
>=20
> gcc doesn't compile this code, no matter what I try to change the x->te=
st<U>=20
> expression to. It does compile the code if the type of x is not defined=
via a=20
> template parameter in test2.
>=20
> If this is against the specs, please tell me, otherwise, looking forwar=
d to=20
> any hints on what may cause this!
>=20
--
VH
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