Which forms of new and delete exist there?
Author
Hello folks, another question:
Currently, I'm trying to rewrite operator new and delete for a class. The standard lists 8 function prototypes as defined in <new> in 17.4.3.4:
* operator new(size_t)
* operator new(size_t, const std::nothrow_t&)
* operator new[](size_t)
* operator new[](size_t, const std::nothrow_t&)
* operator delete(void*)
* operator delete(void*, const std::nothrow_t&)
* operator delete[](void*)
* operator delete[](void*, const std::nothrow_t&)
However, this list doesn't include placement and 2 parameter style types. Is there a full list anywhere of all possible operator new/delete s?
2 more questions:
- Are more than 2 parameters possible for any of this functions?
- I can switch the parameter type of the memory are with the specific class type, right, meaning:
operator delete[](void*)
can be replaced by
operator delete[](VyVeryOwnClass*)
right?
Thanks!
I have a funny feeling I know the answer to this, but is there a reason why you need > 2 parameters for the new/delete operators?
I've written my own memory manager and overloaded the operators as;
extern void *operator new(size_t numOfBytes,MemoryPool *Pool);
extern void operator delete(void *p,MemoryPool *Pool);
the MemoryPool parameter is a pointer to my class, which handles this; any additional parameters I need for memory management are stored within this class.
as I remember it (some time ago I wrote this) I had a tricky time with the delete operator determining "which" bit of memory needed to be removed, and identification but got around it by using the void *p pointer as a reference to whatever object was in the pool at the time.
I've written my own memory manager and overloaded the operators as;
extern void *operator new(size_t numOfBytes,MemoryPool *Pool);
extern void operator delete(void *p,MemoryPool *Pool);
the MemoryPool parameter is a pointer to my class, which handles this; any additional parameters I need for memory management are stored within this class.
as I remember it (some time ago I wrote this) I had a tricky time with the delete operator determining "which" bit of memory needed to be removed, and identification but got around it by using the void *p pointer as a reference to whatever object was in the pool at the time.
17.4.3.4 doesn't list the function prototypes for the new and delete overloads in the <new> header; it lists which function prototypes the program may supply definitions for. The complete list of function prototypes for new and delete overloads in the <new> header is in section 18.4.
Author
Quote:Original post by SiCrane
17.4.3.4 doesn't list the function prototypes for the new and delete overloads in the <new> header; it lists which function prototypes the program may supply definitions for. The complete list of function prototypes for new and delete overloads in the <new> header is in section 18.4.
My bad.
Then as follow up questions:
- Can I specify operator delete(void*, Param1*, Param2*)
if I wanted to (3 paremeters)? Will it still be compatible with 'delete'?
- On the base of which paragraphs are the default implementations from 18.4 composed?
Thanks!
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