Logical program organization

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Basic facilities - slide 41 : 46

Logical program organization

Namespaces are used for the logical program organization of C++ programs

The C++ Progr. Lang. (3. edition): Page 167, 847

Namespaces
- A namespace is a named scope
- Usages of names require namespace qualification
  - namespace::name_within_namespace
- A using declaration can be used to add a name (an alias) to a local scope (such as a function)
  - using N::name;
  - name is declared/defined as a local synonym to N::name
- A using directive allows convenient access to names from a given namespace
  - using namespace N;
  - Can - and should - be used locally, in a function for instance

Names declared in a namespace - natively or by using declarations - take priority over names brought in via using directives

Classes and structs

Illustration of using declarations and using directives.