"using"

[Alex Buell]

Is it legal to do this:

using std:ut, std::cin, std::endl;

If not, why not?

 

[Victor Bazarov]

Is it legal to do this:

using std:ut, std::cin, std::endl;
No.

If not, why not?

Because the Standard says so. If you need rationale behind that
particular part of the Standard, ask in comp.std.c++.

V

 

[Alf P. Steinbach]

* Alex Buell:

Is it legal to do this:

using std:ut, std::cin, std::endl;

Does it compile?

If not, then you can be reasonably sure it's not "legal", in the sense
of valid standard C++.

But if it does compile, you'll have to check the standard, that is, Read
The [beep] Documentation.

If not, why not?

If not, then it's not part of the syntax of the language.

 

[Neil Cerutti]

Is it legal to do this:

using std:ut, std::cin, std::endl;

It's probably legal; you should ask a lawyer. But it's an error in
C++. ;-)

If not, why not?

C++'s namespaces are not a module system. They are a lower-level
feature than that, providing the simplest possible tools to prevent
name-clashes in arbitrary code. Your proposal, while convenient, isn't
part of a complete and minimal interface.

Moreover, I'd want something even more convenient:

using (std) out, cin, endl;

 

[osmium]

Is it legal to do this:

using std:ut, std::cin, std::endl;

No, and it's a pain. If you are freaked out about using namespace std, the
best workaround I know of is to put a bunch of the ones you use in a header
file, keep it handy, and add the header when needed. I would make it the
last header file included.

 

[Alex Buell]

No, and it's a pain. If you are freaked out about using namespace std, the
best workaround I know of is to put a bunch of the ones you use in a header
file, keep it handy, and add the header when needed. I would make it the
last header file included.

I'm not in the least bit freaked out using namespaces, it's just
irritating sometimes to have to pull in just the ones you want to use
if you can't use 'using namespace std' instead.

 

[Roland Pibinger]

No, and it's a pain. If you are freaked out about using namespace std,

Why should you? You can write 'using namespace xyz' in all *.cpp files
and explicitly qualify in the rare case of a name clash.

the
best workaround I know of is to put a bunch of the ones you use in a header
file, keep it handy, and add the header when needed. I would make it the
last header file included.

.... or just 'using namespace xyz'

Best wishes,
Roland Pibinger