From: Alan Mackenzie <acm@muc.de>
To: "Óscar Fuentes" <ofv@wanadoo.es>
Cc: Ivan Andrus <darthandrus@gmail.com>, 23610@debbugs.gnu.org
Subject: bug#23610: 25.0.94; c++-mode doesn't fontify typename... like typename
Date: Mon, 30 May 2016 15:25:39 +0000 [thread overview]
Message-ID: <20160530152538.GA3629__4518.12878386608$1464622033$gmane$org@acm.fritz.box> (raw)
In-Reply-To: <87oa7nbqpm.fsf@wanadoo.es>
Hello, Óscar.
Thanks for your post!
On Mon, May 30, 2016 at 03:49:57PM +0200, Óscar Fuentes wrote:
> Hello Alan.
> Alan Mackenzie <acm@muc.de> writes:
> > I'm not all that familiar with variadic templates. In the declaration
> > below, is the "..." token syntactically part of "typename..." or is
> > better regarded as part of "... Y"?
> Neither, I'll say.
> It is legal to omit the name of the parameter pack (the `Y' in the
> example).
> > I also need to get a feel for what keywords can come before the "...".
> > Obviously "typename", but what about things like "class"?
> Yes, `class' and `typename' are interchangeable here. There is also
> `sizeof':
I thought there might be something like that. ;-)
> template <typename ... Ts> struct Foo {
> void print() {
> printf("Instantiated with %d parameters.\n", sizeof...(Ts));
> }
> };
> int main() {
> Foo<int, double> foo;
> foo.print();
> return 0;
> }
> Prints
> Intantiated with 2 parameters.
> > Do you know of a good web page where these things are explained
> > completely and concisely, yet readably? If so, please tell me!
> Try this, which is short and precise:
> http://en.cppreference.com/w/cpp/language/parameter_pack
That looks like exactly what I need. Thanks very much!
--
Alan Mackenzie (Nuremberg, Germany).
next prev parent reply other threads:[~2016-05-30 15:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-24 17:01 bug#23610: 25.0.94; c++-mode doesn't fontify typename... like typename Ivan Andrus
[not found] ` <mailman.202.1464109329.1216.bug-gnu-emacs@gnu.org>
2016-05-30 12:57 ` Alan Mackenzie
2016-05-30 13:49 ` Óscar Fuentes
2016-05-30 15:25 ` Alan Mackenzie [this message]
2016-07-23 15:13 ` Alan Mackenzie
2016-06-19 21:14 ` Alan Mackenzie
2016-06-22 15:22 ` Ivan Andrus
2016-06-30 14:36 ` Alan Mackenzie
2016-06-30 15:10 ` John Yates
2016-06-30 16:47 ` Alan Mackenzie
2016-06-30 17:24 ` Alan Mackenzie
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