Contents

• CS202 session 16 Scoping
• : Previous -- Exceptions
• : Preparation
• : Due in
• : Class Work
• : : Dr Schuberts Explanation of friends
• : : What is encapsulation in Computer Programming
• : : List as many Name Scopes as you can
• : : What is shadowing in C++ and is it a good thing
• : : How can you avoid polluting the global scope with constants
• : : What does this function return when called 4 times as shown
• : : What does this return when called 4 times
• : : What is the best way to give only derived classes access to data in a base class
• : : How does a function become a friend of a class
• : : Give a well known example of a nested class in the Standard Template Library
• : : When do you create namespaces
• : Next -- Class Hierarchies
• Glossary

CS202 session 16 Scoping

Previous -- Exceptions

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Preparation

Study Chapter 18 and do Review Questions.

Notes: In practice avoid protected data members and private inheritance!

Due in

Hand in one even-numbered question+answer at the start of class.

Bonus for Perfect Project 3 today at start of class.

Class Work

Dr Schuberts Explanation of friends

What is encapsulation in Computer Programming

List as many Name Scopes as you can

What is shadowing in C++ and is it a good thing

How can you avoid polluting the global scope with constants

What does this function return when called 4 times as shown

 int f() {static int c=0; c=c+1; return c; }

 ...

 		cout << f() << "\n";

 		cout << f() << "\n";

 		cout << f() << "\n";

 		cout << f() << "\n";

What does this return when called 4 times

 int f() {       int c=0; c=c+1; return c; }

What is the best way to give only derived classes access to data in a base class

How does a function become a friend of a class

Give a well known example of a nested class in the Standard Template Library

When do you create namespaces

Next -- Class Hierarchies

[ 17.html ]

Next project due in next class. Next quiz in next class and on chapters 16,17,18, and P3.


(2011 Memorial Day): Holiday on Monday.

Glossary

1. accessor::=`A Function that accesses information in an object with out changing the object in any visible way". In C++ this is called a "const function". In the UML it is called a query.
2. Algorithm::=A precise description of a series of steps to attain a goal, [ Algorithm ] (Wikipedia).
3. class::="A description of a set of similar objects that have similar data plus the functions needed to manipulate the data".
4. constructor::="A Function in a class that creates new objects in the class".
5. Data_Structure::=A small data base.
6. destructor::=`A Function that is called when an object is destroyed".
7. Function::programming=A selfcontained and named piece of program that knows how to do something.
8. Gnu::="Gnu's Not Unix", a long running open source project that supplies a very popular and free C++ compiler.
9. mutator::="A Function that changes an object".
10. object::="A little bit of knowledge -- some data and some know how". An object is instance of a class.
11. objects::=plural of object.
12. OOP::="Object-Oriented Programming", Current paradigm for programming.
13. Semantics::=Rules determining the meaning of correct statements in a language.
14. SP::="Structured Programming", a previous paradigm for programming.
15. STL::="The standard C++ library of classes and functions" -- also called the "Standard Template Library" because many of the classes and functions will work with any kind of data.
16. Syntax::=The rules determining the correctness and structure of statements in a language, grammar.
17. Q::software="A program I wrote to make software easier to develop",
18. TBA::="To Be Announced", something I should do.
19. TBD::="To Be Done", something you have to do.
20. UML::="Unified Modeling Language".
21. void::C++Keyword="Indicates a function that has no return".

End