Re: does pointer refer to a heap object?

[Brad Anderson]

On Saturday, 27 July 2013 at 17:58:20 UTC, Carl Sturtivant wrote:

Given a pointer to a struct, is there a clean way to determine 
if that struct is allocated on the heap or not? Or 
alternatively to determine whether it has finite or infinite 
lifetime (in TDPL speak)?

import core.memory, std.stdio;

struct A { }

void main()
{
    A a;
    auto ap = &a;

    auto bp = new A;

    writeln("ap", GC.addrOf(ap) ? "" : " not", " allocated with 
the GC");
    writeln("bp", GC.addrOf(bp) ? "" : " not", " allocated with 
the GC");
}


Note that the heap is more than just GC allocated memory.  C 
malloc allocates on the heap but would fail the above test (as it 
should).