Re: C++ Memory Management Innovation: GC Allocator

On 4月30日, 上午7时43分, "Chris Thomasson" <cris...@[EMAIL PROTECTED]
>
wrote:
> I am interested in increasing the granularity of region allocators. I
need
> to look at your source-code when I get some time.
>

Hello all,

Recently I write a new class named "boost::gc_alloc" (see
http://svn.boost.org/trac/boost/browser/sandbox/memory/boost/memory/gc_alloc.hpp).
Here is its specification:

class gc_alloc
{
public:
   gc_alloc(); // same as: gc_alloc(tls_block_pool::instance());
   gc_alloc(block_pool& pool); // initialize by given a pool instance
   gc_alloc(gc_alloc& a); // initialize by given a indirect pool
instance
   ~gc_alloc(); // clear

   void* allocate(size_t cb); // allocate memory without cleanup
function
   void* allocate(size_t cb, destructor_t fun); // allocate memory with
cleanup function

   void deallocate(void* p, size_t cb);

   template <class Type>
   void destroy(Type* obj);

   template <class Type>
   void destroyArray(Type* array, szie_t count);

   void clear(); // cleanup and release all memory allocated by the
allocator

   void swap(gc_alloc& o); // swap two instances
};

Comparing with boost::scope_alloc (http://svn.boost.org/trac/boost/
browser/sandbox/memory/boost/memory/scoped_alloc.hpp), It append these
methods:

{
   void deallocate(void* p, size_t cb);

   template <class Type>
   void destroy(Type* obj);

   template <class Type>
   void destroyArray(Type* array, szie_t count);
}

Yes, it allows you to delete objects manually. But this is OPTIONAL,
not a MUST. You don't need to delete objects, if you don't want or
forget to do.

However, I have some additional NOTES:

1. boost::auto_alloc (its old name is "AutoFreeAlloc") and
boost::scoped_alloc (its old name is "ScopeAlloc") are implemented for
four years (from 2004). And they are widely used and tested. They are
proved in practice.

2. boost::gc_alloc was implemented yesterday. It is complexer than
boost::auto_alloc and boost::scoped_alloc. Is it useful? Maybe, but it
needs to be proved itself.

If you are interested in it, refer the source code:
http://svn.boost.org/trac/boost/browser/sandbox/memory/boost/memory/gc_alloc.hpp


-- 
      [ See http://www.gotw.ca/resources/clcm.htm
for info about ]
      [ comp.lang.c++.moderated.    First time posters: Do this! ]