Re: Using special allocator interfaces...

"Chris Thomasson" <cristom@[EMAIL PROTECTED]
> wrote in message 
news:6YadndjqnMtxkL7VnZ2dnUVZ_rSrnZ2d@[EMAIL PROTECTED]
> "Alf P. Steinbach" <alfps@[EMAIL PROTECTED]
> wrote in message
[...]



> // Can I use the above allocator interface like this:
> template<typename T>
> struct AllocatorBlock {
>  unsigned char mBuffer[sizeof(T)];
>  Allocator::Region* mRegion;
>
>  static void* MemRequest() {
>    Allocator::Region* region;
>    AllocatorBlock* const block = (AllocatorBlock*)
>      Allocator::MemRequest(&region, sizeof(T));
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^


This is in ERROR!

    The size is all wrong on a per-object basis; here is correction:


    AllocatorBlock* const block = (AllocatorBlock*)
      Allocator::MemRequest(&region, sizeof(*block));
    block->mRegion = region;
    return block->mBuffer;


    sizeof(T) is not sufficient, however sizeof(*block) is.




>    block->mRegion = region;
>    return block->mBuffer;
>  }
>
>  static void MemRelease(void* ptr) {
>    AllocatorBlock* const block = (AllocatorBlock*)ptr;
>    Allocator::MemRelease(block->mRegion, ptr, sizeof(T));
>  }
> };





[...]

Strange that I did not get flamed for this yet!


;^D