struct on heap with std.experimental.allocator

[jmh530 via Digitalmars-d-learn]

I modified one of the first examples from 
std.experimental.allocator to put a struct on the heap (below).

My sense is that putting it on the GC heap gives the struct 
reference semantics. I was struck by two things. First, I didn't 
have to use (*a).x, I could just use a.x. Also, when I assign a 
struct object to another instance, changes in the new one also 
effect the original.


import std.experimental.allocator;

struct A
{
        int x;
}

void main()
{
        A* a = theAllocator.make!A(42);

        assert((*a).x == 42);
        assert(a.x == 42);
        
        auto b = a;
        assert(b.x == 42);
        ++b.x;
        assert(b.x == 43);
        assert(a.x == 43);
}