[Cpptool-develop] Abt Sven's question on scope

[Rohith R. <man...@ho...>]

This is what the ANSI C++ std has to say:
http://www.comnets.rwth-aachen.de/doc/c++std/basic.html
The example below will probably answer the question.

1 Every  name  is  introduced  in  some portion of program text called a 
declarative region, which is the largest part of the program in  which that  
name  is  valid,  that  is, in which that name may be used as an   
unqualified name to refer to the same entity.  In general,  each  particular 
  name is valid only within some possibly discontiguous portion of program 
text called its scope.  To determine the scope of a  declaration,  it is 
sometimes convenient to refer to the potential scope of a declaration.  The 
scope of a declaration is the same as  its  potential  scope unless the 
potential scope contains another declaration of the same name.  In that 
case, the potential scope of  the  declaration in the inner (contained) 
declarative region is excluded from the scope of the declaration in the 
outer (containing) declarative region.

2 [Example: in
          int j = 24;
          int main()
          {
                  int i = j, j;
                  j = 42;
          }
  the identifier j is declared twice as a name (and  used  twice).   The  
declarative  region  of  the first j includes the entire example.  The 
potential scope of the first j begins immediately  after  that  j  and 
extends to the end of the program, but its (actual)  scope excludes the text 
between the , and the }.  The declarative region  of  the  second 
declaration of j (the j immediately before the semicolon) includes all the 
text between { and }, but its potential scope excludes the  declaration  of 
i.  The scope of the second declaration of j is the same as its potential 
scope.  ]

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