Concepts, Techniques, and Models of Computer Programming - Chapter 4 pps

... roots of declarative concurrency. Concurrency is also a key part of three other chapters. Chapter 5 extends the eager model of the present chapter with a simple kind of communication chan- nel. Chapter ... for concurrent object-oriented programming. Chapter 11 shows how to do distribut- ed programming, i.e., programming a set of computers that are connected by a network....

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... huge number: 933 26215 44 3 94 41526 81699 23885 62667 0 049 0 71596 82 643 81621 46 859 29638 95217 59999 32299 15608 941 46 39761 56518 28625 36979 20827 22375 82511 85210 91686 40 000 00000 00000 00000 ... has. A typical low-cost personal computer with 64 MB of memory can handle hundreds of thousands of digits. The skeptical reader will ask: is this huge number really the fact...

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... product to 6-digit numbers then the naive solution takes 45 seconds. 1 The propagate- and- search solution of Chapter 12 takes less than 0 .4 second to solve the same problem. 9.2.2 Puzzles and the n-queens ... X2]#B#(X1|X2|B)| Copyright c  200 1-3 by P. Van Roy and S. Haridi. All rights reserved. 6 74 Relational Programming tive proof of this [1 94, 188]. The successful se...

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... instead of programming in models. We start from the declarative programming techniques of Chapter 3 and add state and concurrency ex- actly where it is needed. This is a practical example of combining ... directly with QTk. This chapter gives most of the key ideas underlying QTk but only shows a small fraction of the available widgets. Structure of the chapter The...

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... Choosinganindexedcollection 44 1 6.5.3 Othercollections 44 2 6.6 Reasoningwithstate 44 4 6.6.1 Invariantassertions 44 4 6.6.2 Anexample 44 5 6.6.3 Assertions 44 8 6.6 .4 Proofrules 44 9 Copyright c  200 1-3 by P. Van Roy and ... . . . 129 3 .4 Programmingwithrecursion 130 3 .4. 1 Typenotation 131 3 .4. 2 Programmingwithlists 132 3 .4. 3 Accumulators 142 3 .4. 4 Differencelists 1...

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... with single-shot channels. Chapters 4 and 5 show other types of channels (with sequences of messages) and do concurrent composition of processes. Copyright c  200 1-3 by P. Van Roy and S. Haridi. ... of many other techniques. This book focuses on three in particu- lar: object-oriented programming, graphical user interface (GUI) design, and component-based programming. I...

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... instead of standard lists: • Flatten of nil is X#X (empty difference list). • Flatten of X|Xr where X is a nested list, is Y1#Y4 where flatten of X is Y1#Y2, flatten of Xr is Y3#Y4 ,and equate Y2 and ... declarative model and situate it with respect to other models. Copyright c  200 1-3 by P. Van Roy and S. Haridi. All rights reserved. 3 .4 Programming with recursion 149...

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... in the larger context of component-based programming. Because of message-passing concurrency we no longer have the limitations of the synchronous “lock-step” execution of Chapter 4. We first introduce ... tuples: area({square, Side}) -& gt; Side*Side; area({rectangle, X, Y}) -& gt; X*Y; area({circle, Radius}) -& gt; 3. 141 59*Radius*Radius; area({triangle, A, B, C}) -&...

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... Algol-60 and structured programming [46 , 45 , 130], which led to Simula-67 and object-oriented program- ming [137, 152]. 2 This book sticks to the traditional usage of declarative as stateless and ... elements of an array: Copyright c  200 1-3 by P. Van Roy and S. Haridi. All rights reserved. 41 5 A problem of terminology Stateless and stateful programming are often...

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... values, and the dynamic creation of classes. We start with forwarding since it is the simplest. Copyright c  200 1-3 by P. Van Roy and S. Haridi. All rights reserved. 540 Object-Oriented Programming Applications ... The first way, often-used in object-oriented programming, uses inheritance. The second way uses higher-order programming. We will see that the first way is just a syn...

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