Answer the following statements true (T) or false (F)

Question

1. In C++, a compilation unit is a class or function.
2. An unnamed namespace provides a facility for collecting names that are local to the file where the unnamed namespace is located. Such names are available in that file, and are unavailable in any other file.
3. A function defined inside an unnamed namespace requires qualification.
4. You can use the static qualifier with a global function, class or variable to get the same effect as an unnamed namespace.

Answer 1

1. False
A C++ compilation unit is the file. A file may contain the contents of include files (files that are present by way of #include directives), global namespace function and class definitions, an unnamed namespace, and possibly one or more named namespaces.
2. True
The names in an unnamed namespace can be reused in another unnamed namespace that is located in another file with no chance of name clash.
3. False
An unnamed namespace grouping behaves as if the unnamed namespace were named with a name that is not used anywhere else in the program, perhaps unique_1. The rest of the file behaves as if it had the directive,
using namespace unique_1;
so that the names from the namespace can be used in the file, but are unavailable in any other file.
4. False
This might work for a time, but for some future version of your C++ compiler, this will stop working. This use of the keyword static in C++ is being phased out. It is being replaced by unnamed namespaces. Some future version of the C++ compiler will give an error when compiling such code. (Programmers say, “Some later version of the compiler will break your code.”)