The Gerris Object System

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Revision as of 16:43, 21 August 2012 GeordieMcBain (Talk | contribs) (linked to GLib, Gnome, GTK+, C operator precedence table, etc.) ← Previous diff		Revision as of 16:46, 21 August 2012 GeordieMcBain (Talk | contribs) (→Note for dummies: pointers to functions - added navigation to footer) Next diff →
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	we would define a function of an integer returning a pointer to an integer.		we would define a function of an integer returning a pointer to an integer.
	(That [http://www.gnu.org/software/gnu-c-manual/gnu-c-manual.html#Operator-Precedence C operator precedence table] comes in handy here.)		(That [http://www.gnu.org/software/gnu-c-manual/gnu-c-manual.html#Operator-Precedence C operator precedence table] comes in handy here.)
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		+	----
		+	⇐ '''previous''': [[Programming the Advection Scheme]], ⇑ '''up''': [[Gerris Flow Solver Programming Course for Dummies]], ⇒ '''next''': [[An Example of Use of the Gerris Object System]]

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Revision as of 16:46, 21 August 2012

Gerris and GTS are programmed in a style analogous to that of GLib, Gnome and GTK+. It is a style of C programming that offers several advantages:

• Most aspects of Object-Oriented Programming (OOP), such as the existence of classes with their own methods and inheritance.

• The ability to interface to other programming languages. (As far as I know, this feature is not used in Gerris, but this has been exploited to give GTS Python bindings in PyGTS.)

To implement Object-Oriented Programming, Gerris/GTS uses its own ‘Object system’. This system is analogous to the GLib object system (GObject), but not identical to it.

THIS CHAPTER IS CURRENTLY BEING WRITTEN.

Note for dummies: pointers to functions

At this stage you (or your teacher if this is a live class) should remind the basic facts about pointers to functions. Remember in particular that

int foo(int bar);

declares a function of an integer returning an integer and

int (*ptr_foo) (int bar);

declares a pointer to an integer function. If we were to write

int *ptr_foo (int bar);

In that case, because '()' has precedence over indirection '*', we would define a function of an integer returning a pointer to an integer. (That C operator precedence table comes in handy here.)

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⇐ previous: Programming the Advection Scheme, ⇑ up: Gerris Flow Solver Programming Course for Dummies, ⇒ next: An Example of Use of the Gerris Object System