soft and program: comp.lang.c++ - 25 new messages in 17 topics

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* template error - 2 messages, 2 authors
http://groups.google.com/group/comp.lang.c++/t/1d7d6b77e8753579?hl=en
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* dealing with lower level programmers - 1 messages, 1 author
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==============================================================================
TOPIC: template error
http://groups.google.com/group/comp.lang.c++/t/1d7d6b77e8753579?hl=en
==============================================================================

== 1 of 2 ==
Date: Wed, Jul 29 2009 12:04 pm
From: Juha Nieminen

SG wrote:
> You can solve this problem in a number of ways. I'm going to mention
> three:
>
> (A) Replace the using directive with a couple of using
> declarations:
>
> using std::cout;
> using std::endl;
>
> (B) Keep the using directive and put your functions and classes
> in your own namespace N. When you use an unqualified name X
> inside your namespace N, the names in std:: will only be
> considered in case your own namespace doesn't contain an X.
> If your namespace contains an X it will "hide" other Xs from
> the global scope.
>
> (C) Keep the using directive and make sure that you don't
> use names that also live in the std:: namespace.

How about not using the 'using' directive at all? My code has become
much more readable after I stopped using it. Don't believe dissenting
opinions, they are wrong. The code *does* become more readable.

== 2 of 2 ==
Date: Wed, Jul 29 2009 3:39 pm
From: Jerry Coffin

In article <R21cm.128$TB5.88@read4.inet.fi>, nospam@thanks.invalid
says...

[ ... ]

> How about not using the 'using' directive at all? My code has
> become much more readable after I stopped using it. Don't believe
> dissenting opinions, they are wrong. The code *does* become more
> readable.

There are times that a using directive (or at least a using
declaration) can be useful, and there's no real alternative to it.

The canonical example is something like a sort routine. If swap has
been specialized for the type being sorted, we want to use that swap.
If swap has not been specialized for the type, we want to fall back
on using std::swap instead.

We can get that with code something like this:

using std::swap;

template <class T>
void sort(/* ... */) {

// ...
// x1 and x2 are T's.
if (x2 < x1)
swap(x1, s2);
// ...
}

The trick here is simple: if we specify std::swap, then that's what
will be used, even if T provides its own swap. On the other hand, if
we try to specify T's namespace, the code won't compile unless T
actually _does_ provide its own swap (and we don't want that
restriction -- just for example, it would then fail for all built-in
types).

The cure is pretty simple, as shown above. If there's a 'swap' in T's
namespace, argument dependent lookup will find it, and that's what
will get used. Otherwise, because of the using declaration, std::swap
will be found instead.

In the case above, I've used a using declaration, but if (for
example) we were using quite a few different things like this, a
using directive would become more convenient. Just for example, the
code above uses the less-than operator, but for genericity it should
really use a comparison function. Again, std::less<T> might be the
appropriate version (it would be equivalent to what's above) but
again, if T provides its own less(), we'd prefer to use that. In this
case there's not nearly as big a problem though, simply because
std::less<T> will use T's operator< (so all that's usually needed is
to supply operator< if ordering is at all appropriate).

--
Later,
Jerry.

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== 1 of 1 ==
Date: Wed, Jul 29 2009 12:08 pm
From: candy

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== 1 of 1 ==
Date: Wed, Jul 29 2009 12:13 pm
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== 1 of 1 ==
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