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(gcc-300.info)Scopes

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Scopes
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   The root of the entire intermediate representation is the variable
`global_namespace'.  This is the namespace specified with `::' in C++
source code.  All other namespaces, types, variables, functions, and so
forth can be found starting with this namespace.

   Besides namespaces, the other high-level scoping construct in C++ is
the class.  (Throughout this manual the term "class" is used to mean the
types referred to in the ANSI/ISO C++ Standard as classes; these include
types defined with the `class', `struct', and `union' keywords.)

Namespaces

Member functions, types, etc.

Classes

Members, bases, friends, etc.