[svn-upgrade] Integrating new upstream version, ion3 (20071109)

[ion3.git] / doc / objectsimpl.tex

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-\section{Object system implementation}
-
-First, to get things clear, what are considered objects here are C
-structures containing a properly initialised \type\indextype{WObj}
-structure defined in \file{ioncore/obj.h} as the first element (or the
-first element of the structure which is the first element and so on which
-gives rise to inheritance). The \type{WObj} structure contains a pointer
-to a \type{WObjDescr}\indextype{WObjDescr} class type info structure and
-a list of so called ``watches''. The \type{WObjDescr} structure simply
-lists the class name, a table of dynamic functions and a pointer to
-deinitialisation function (or ``destructor'').
-
-Ion does not do any reference counting, garbage collecting or other
-fancy things related to automatic safe freeing of objects with its
-simplistic object system. Instead special watches (the \type{WWatch}
-\indextype{WWatch} structure) may be used to create safe references to
-objects that might be destroyed during the time the specific pointer is
-needed. When an object is destroyed, its list of watches is processed,
-setting the pointers in the watches to NULL and the watch handlers for
-each watch are called.