Twin Cities SIGAda presents:

When Objects are not good enough, or
Why are there 7 kinds of types plus type composition in Ada?

7:00 p.m., Thursday, Jan 18, 2001
Founder's Hall Auditorium
on Metro State University's St. Paul Campus
700 E. 7th St.,St. Paul, MN 55106
This meeting is Co-hosted by the Information
and Computer Sciences Department at
Metropolitan State University and TCSIGAda.
Get a FREE Ada CDROM. See for details.

Today's computer programs are very large. We can no longer afford to write each subprogram group separately. Objects are today's cure-all for reusability. However, objects have a number of disadvantages, including hiding information from both the programmer and the compiler. Indeed, solid types, composed in a type-rich language such as Ada, are superiour to objects in their understandability, efficiency, and correctness. In this meeting, Paul will discuss the kinds of things which need to be parameterized for resuability, and how objects, as defined by programming languages such as Java and C++ fall short. He will describe how one can use a language which is rich in:

to provide ways to create reusable code in such a manner that we need only small, or no, amounts of testing.

About the Speaker:

Paul Stachour has been interested in reusability since he found himself rewriting and retesting stack packages in 1970. He is concerned about the lack of separation of interface and implementation in many languages, and how that prevents reusablity. He has observed that languages that do not enable one to manipulate types do not not seem to scale, while those that do so statically "inside the language" makes reusability easy and reliable. Paul has been interested in what makes software "quality software" ever since. In particular, he is interested in what languages, features, tools, and processes prevent defects. Paul is the current president of TCSIGAda.

Bus Route: 9, 10, 12, 15 (St. Paul). These buses may have any terminal letter.
Driving from east on I-94 in St. Paul: Take the Mounds Boulevard (left lane) exit, straight ahead on Sixth Street one block to Maria Avenue; turn left on Maria Avenue; parking lot is on the right.
Driving from east on I-94 in St. Paul: Take the Mounds Boulevard exit; turn right at Sixth Street to Maria Avenue; turn left on Maria Avenue; parking lot is on the right.
There is limited street parking (free), recommend that you park in the Metro State lot ($1.50).
The Auditorium is located in Founders Hall. As you leave the parking lot, you will be facing a quadrangle with buildings on three sides. Founders Hall is on the left (or south) side of the quadrangle. Enter the north doors and turn right. Go through the open area and through a set of doors. The auditorium will be directly in front of you.
Please contact Paul Stachour if you need additional directions.

For information about TCACMSIGAda, call (952)-884-5977 or visit