Why do several of the standard operators not have standard functors?

Question

We have:

• std::plus (+)
• std::minus (-)
• std::multiplies (*)

Answer 1

The bitwise operators are added in C++0x. I also find not_equal_to already present.

Others, like sizeof and some casts are compile time operators so would be less useful in a functor.

New and delete are abstracted in allocators. Do we need more of that?