Introduction

Sather - A Language Tutorial
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# Chapter 1. Introduction

Sather is an object oriented language designed to be simple, efficient, safe, and non-proprietary. It aims to meet the needs of modern research groups and to foster the development of a large, freely available, high-quality library of efficient well-written classes for a wide variety of computational tasks. It was originally based on Eiffel but now incorporates ideas and approaches from several languages. One way of placing it in the "space of languages" is to say that it attempts to be as efficient as C, C++, or Fortran, as elegant but safer than Eiffel or CLU, and to support higher-order functions as well as Common Lisp, Scheme, or Smalltalk.

Sather has garbage collection, statically-checked strong (contravariant) typing, multiple inheritance, separate implementation and type inheritance, parameterized classes, dynamic dispatch, iteration abstraction, higher-order routines and iters, exception handling, assertions, preconditions, postconditions, and class invariants. Sather code can be compiled into C code and can efficiently link with object files of other languages. pSather, the parallel and distributed extension, presents a shared memory abstraction to the programmer while allowing explicit placement of data and threads.

Sather and the GNU Sather compiler are licensed under a GPL/LGPL-combination aimed at encouraging contribution to the public library without precluding the use of Sather for proprietary projects.

This chapter will provide a basic introduction for new users, pointing to sources of information about the language and the compiler. It also contains a summary of Sather features - for those familiar with another object-oriented language, this section provides an overview of the key features of Sather.

# 1.1. Acknowledgements

This text has its roots in the Sather 1.1 specification, the Eclectic tutorial and Holger's iterator tutorial. This document also contains several organizational ideas and some text from S. Omohundro's originally planned Sather book.

This text has benefitted from corrections, comments and suggestions from several people including Cary D. Renzema, Jerome Feldman, Claudio Fleiner and Arno Jacobsen. Particular thanks to Cary, Arno and Feldman for detailed error reports. Arno also made several suggestions regarding terminology and examples that have been incorporated.

In the course of the transition from ICSI Sather to GNU Sather in Summer 1999, the text has been converted to SGML and heavily cleaned up by Norbert "Nobbi" Nemec.

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