Re: question about linker

On 12/4/24 15:55, David Brown wrote:

On 04/12/2024 16:09, Bart wrote:

...

My remarks have been about the namespace that is created by a module.
>
I understand that C++ namespaces can be created in other ways, like
classes.

 
In reference to C++, I have been using the term "namespaces" the way C++
specifically defines the term "namespace".  Perhaps I should have given
a reference to that in some way - this is comp.lang.c, after all.
 
What you are now talking about is what C calls "name spaces" - with a
space.  C++ does not use that term in its standards (at least, not in
the C++20 standards I have open here) - it does not have a clear name
for the concept, as far as I have found.  (I am not nearly as familiar
with the C++ standards as I am with the C standards, so if this matters
then perhaps someone else can chime in.)

The latest version of the C++ standard that I have is n4860.pdf, dated
2020-03-31. It has two occurrences of the phrase "name space" outside of
the section that descries differences from C:

8.2p1: "Labels have their own name space ..."
15.6p8: "There is one name space for macro names."

All other C++ identifiers reside in the ordinary name space

Those three namespaces all exist in C. In addition, each C struct or
union has a separate name space; C++ does not have the same rule, but
achieves a similar effect by giving those names a distinct scope.

In C struct, union, and enumation tags have their own namespace, in C++
they reside in the ordinary name space.

Half of all the differences between C and C++ that result in textually
identical code having different well-defined behavior in each language
are tied to differences in how name spaces and scopes work. Those
differences are deeply fundamental, and not easily removed.