Re: [boost] portable precise garbage collector for C++

From: Achilleas Margaritis (axilmar_at_[hidden])
Date: 2007-09-17 10:55:37

Larry Evans wrote:
> On 09/17/07 03:30, Achilleas Margaritis wrote:
>> Larry Evans wrote:
>>> On 09/16/07 16:56, Achilleas Margaritis wrote:
>>>> Dear boost developers,
>>>>
>>>> You can find a new version of my portable precise C++ garbage collector 
>>>> in vault/memory.
> [snip]
>>>> Is any one interested?
>>> How does this collector determine the location of pointers on the stack
>>> and within the heap?
>> An internal bit map is used as a pointer database. Each bit represents 
>> one pointer location in memory.
>>
>> When the class gc_ptr<T> is created, the bit that corresponds to the 
>> pointer's address is set.
> 
> What about gc_ptr<T*>?  IOW, what if the pointer is actually a pointer
> to a c array of T or a std::vector<T> or a pointer to std::list<T>.
> 
> OOPS.  Just read the cppgc.txt which says:
> 
> 4) manage arrays of objects
> 
> However, I'm still wondering if it cppgc can handle 
> gc_ptr<std::vector<T> > or pointer to any other std container.
> Do you have tests for these cases?

It's very easy to make an STL allocator for gc: the allocator's pointer 
type will be gc_ptr<T>.

The following will be possible:

gc_ptr<std::vector<gc_ptr<Foo> > foos = gc_new std::vector<gc_ptr<Foo> , 
gc_allocator<T> >;

> 
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