Re: C++ new/delete operator with shared arena in 2.0

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Jim Helman (jimh++at++surreal)
Wed, 20 Dec 95 19:13:14 -0800

I'd expect most user subclasses to be derived from pfObject.
Those classes would be using pfObject::new().

For a subclass foo of pfObject:

        new(arena) foo; == allocate foo from arena
        new foo; == allocate foo from pfGetSharedArena()

As for pfMemory::new():

        new(nbytes, arena) pfMemory; == pfGetMemory(pfMalloc(nbytes, arena));
        new(nbytes) pfMemory; == pfGetMemory(pfMalloc(nbytes, pfGetSharedArena()));
        new pfMemory; == bogus, no malloc size provided

Note the first argument in the declaration in the header files,
"size_t s," is created implicitly by C++ from the size of the object
and is not visible to the C++ application.

rgds,

-jim helman

jimh++at++surreal.asd.sgi.com
415/933-1151

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