gratuitous new features in 2.0
Alex Martelli
alex at magenta.com
Fri Aug 25 11:16:46 EDT 2000
"Roy Katz" <katz at Glue.umd.edu> wrote in message
news:Pine.GSO.4.21.0008250847320.4353-100000 at z.glue.umd.edu...
[snip]
> That last point is what especially concerns me. C++ is full of these
> one-context throw-away grammatical oddities such as 'unsigned short
> BIT_FIELD_NAME: N' (the colon) and 'using namespace ...' (could you
> *ever* put anything other than 'namespace' in the 'using'
> declaration??)
Absolutely!!! "using namespace X;" in C++ is somewhat like
"from X import *" in Python -- something that you are *VERY
RARELY* supposed to do! It injects ALL names from X into
the current namespace, half-defeating namespaces' purpose.
The *normal* case of 'using' in C++ is, rather:
using X::justonename;
which is somewhat akin to Python's:
from X import justonename
i.e., injects into the current namespace just X::justonename
(in C++; in Python, X.justonename) as unqualified 'justonename'.
Alex
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