Reuse object memory?

[Namespace via Digitalmars-d-learn]

It seems that D has currently no direct support to reuse object 
memory.
D should add a new-placement syntax:
----
Foo f = new Foo(42);
new (f) Foo(23);
----
and/or should add an emplace overload which takes an object:
----
T emplace(T, Args...)(ref T obj, auto ref Args args) if (is(T == 
class)) {
     if (obj is null)
         return null;

     enum size_t ClassSize = __traits(classInstanceSize, T);
     void[] buf = (cast(void*) obj)[0 .. ClassSize];

     import std.conv : emplace;
     return emplace!(T)(buf, args);
}
----