Re: New Book: The School of Niklaus Wirth

Im Artikel 00-11-087, "Joachim Durchholz" <joachim_d@gmx.de>
schreibt:


>E.g. a call like 'foo.bar(goo)' will select the function using the
>run-time type of the value in 'foo' and the compile-time type of 'goo' -
>and it's easy to mix these up when programming in the trenches.


I just wondered about runtime type checks on procedure arguments. What
you describe here are virtual methods, also available in OPL.


The possibility of confusion is correct, I confused both virtual and
overloaded myself, after I hadn't used C++ for some years.


>>Standard Pascal does indeed have dynamic memory allocation. The routines are
called 'new' and 'dispose'.<<


Thanks, you're right. I had misplaced my Pascal book :-(


But these procedures only allow to allocate instances of fixed data
types, not of array-like data structures of an arbitrary size. Such
dynamic memory allocation is incompatible with standard Pascal, as
well as is pointer arithmetic.


DoDi

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