Re: Will two symbols with the same name clash?

From:

Victor Bazarov <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++

Date:

Fri, 23 Apr 2010 10:24:16 -0400

Message-ID:

<hqsaig$hrp$1@news.datemas.de>

DeMarcus wrote:

Paul Bibbings wrote:

DeMarcus <use_my_alias_here@hotmail.com> writes:

If I define the variables like this

file1.cpp
static int varA;

file2.cpp
static int varA;

Am I allowed to send either varA pointer to other places in the
application?

Are you able to say a little more about what you are trying to achieve?
With the little information we have, it strikes me, at least, as a
little convoluted. Your question began with name clashing, then sought
a method to make your same-named variables TU-local, and now you are
asking how you can refer to these same-named variables outside of the TU
they're defined in.

Questions to be asked include, in the first instance, "Why are your
variables named the same?" "What application-wide visibility do you want
for these variables?" Then you might want to ask yourself to what
extent your answers to these questions conflict.

I want to achieve the following.

file_class.cpp
const MessageClass ERROR( "Could not find file" );

class FileClass
{
public:
   FileClass()
   {
      GlobalRegister::register( &ERROR );

What does that do?

   }

   void open( string s )
   {
      if( /* Error when opening file */ )
         std::cerr << ERROR << std::endl;
   }
};

calculation_class.cpp
const MessageClass ERROR( "Could not calculate" );

class CalculationClass
{
public:
   CalculationClass()
   {
      GlobalRegister::register( &ERROR );

What does that do?

   }

   void calculate()
   {
      if( /* Error during calculation */ )
         std::cerr << ERROR << std::endl;
   }
};

I want to allow any file be able to use the symbol ERROR but at the same
time they shall be able to register the pointer to that variable

Why? What for?

> without

clashing with other variables with the same symbol name.

What does registering have to do with compilation? Are you confusing
run-time behavior (of your system) with the behavior of the compiler
(who determines and reports "name clashes")?

V
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