Hi,

There seems an oversight in the C++ Standard.  I can find the sections
where the declarations for a placement-delete operator are desribed
but I cannot find a place where the syntax used to invoke placement
delete is specified.

Am I correct in that no such section exists?  Or did I miss it somewhere?

Can I assume the invocation syntax to be parallel to placement new?  As in:

A* a = new (arg1,arg2)A;
delete (arg1,arg2)a;

Any insight would be appreciated,

- Itai

-------------------------------------
Itai Danan
idanan@ibm.net
-------------------------------------



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Itai Danan wrote:
>
> There seems an oversight in the C++ Standard.  I can find the sections
> where the declarations for a placement-delete operator are desribed
> but I cannot find a place where the syntax used to invoke placement
> delete is specified.

There is no such syntax, and it isn't an oversight. The obvious
syntax
 delete (<args>) ptr;
is ambiguous. Stroustrup could not find a reasonable syntax for a
placement-delete, and the C++ Committee couldn't either.

The best you can do is to destroy the object and call the "placement"
version of operator delete directly. Example:

 void* operator new(size_t sz, const T& t) { ... }
 void operator delete(void* ptr, const T& t) { ... }

 T T_obj;
 U* p = new (T_obj) U;
 ...
 p->~U(); // destroy the heap object
 operator delete(p, T_object); // recycle the storage

--
Steve Clamage, stephen.clamage@sun.com


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