Re: sup****ting header-less blocks in memory allocators...

Dmitriy V'jukov a écrit :

> The only thing I don't like is dynamic dispatch on size.
> Allocation/deallocation functions in fixed size allocator can be as
> small as 5 machine instructions. So dynamic dispatch on size can
> increase cost of allocation several times!

Mmh. I think my programs don't need as much optimisation as yours ;)

> The only thing we can do is:
> 
>     __forceinline static void* operator new ( size_t sz )
>     {
>         // resolution at runtime
>         if ( sz <= 4 && sizeof(derived_t) <= 4 )
>             return alloc_4() ;
>         else if ( sz <= 8 && sizeof(derived_t) <= 8 )
>             return alloc_8() ;
>         else if ( sz <= 16 && sizeof(derived_t) <= 16 )
>             return alloc_16() ;
>         else
>             return ::malloc( sz ) ;
>     }
> 
> and pray for inlining :)

Yes.