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Objektorientierte Programmiersprache C++: Vollständige Einführung anhand von Beispielen (VDI-Buch) (German Edition)

In diesem Werk werden alle Aspekte der Sprache C++ behandelt, deshalb ist das Buch ebenso für Einsteiger, mit oder ohne Vorkenntnisse über eine andere Programmiersprache, als auch für Umsteiger von anderen Programmiersprachen bzw. C-Programmierer geeignet. Die Darstellung der Sachverhalte erfolgt knapp und systematisch, die Beispiele sind kurz, prägnant und compiler- unabhängig und auf allen Rechnern mit C++ 2.

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Otherwise, however, -r would contain more than one operator, so that a temporary variable must be used instead. Then the effect of ß' is to fill ß with the negation of the temporary, and to prefix to the resulting instruction sequence an assignment of r to the temporary: ß'S"r = sv := r[S;;'- s;n; /3S"'(-Sv) where sv =S' and when r rt (Ss"), S"' = sv + 1. ln the latter case, [ -e]rr,intexpS17S' ß will give an instruction sequence of the form instructions for setting temporaries in r ; sv := r[s;;' - s:;] ; ßS"' (-Sv) .

Li'SI7', where = 35 ]ohn C. ····mk-callcpnSin )] h = mk-subrcp 1 S a1 in = mk-subrcpnS an (ai, ... • an)= eS([p][rrlt:8],8SI7'). Here 17' and h, ... , in are mutual fixed points that can be represented in the compiler by using a reference for each of the instruction sequences i11 ••. , in. It is clear that the method outlined in this section could also be used to deal with source language types, such as record or object types, that are defined by products. To treat binary products, for example, one would take ne x e'> = (re) o

It may belarger than S' since the stack at this point may include temporaries occurring in r. • S"' = sv + 1 will be the current stack descriptor just after the assignment sv := r. It is just large enough to include the temporary sv. Thus, the effect of the displacement increment [s;;'- s;;1 is to deallocate any temporaries occurring in r and allocate the temporary sv. 25 ]ohn C. \S" . \r. ßS"(-r))), where usetmp is a function encapsulating the use of temporary variables: usetmp S' ßS" r = { when r E (Ss") ßS"r sv := r[S:l'- s;;J; ßS"'Sv when r f!

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