[Issue 4247] New: Cannot create default-constructed struct on heap when constructor is defined

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4247

           Summary: Cannot create default-constructed struct on heap when
                    constructor is defined
           Product: D
           Version: 2.041
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: schveiguy at yahoo.com


--- Comment #0 from Steven Schveighoffer <schveiguy at yahoo.com> 2010-05-28 15:55:49 PDT ---
If I want a struct on the heap, I do this:

struct S
{
}

auto s = new S;

But if I give S a constructor:

struct S
{
  this(int n) {}
}

auto s = new S;

dmd complains:
Error: constructor S.this (int n) is not callable using argument types ()

So I do this:

struct S
{
  this() {}
  this(int n) {}
}

but dmd now complains:
Error: constructor S.this default constructor not allowed for structs

So the auto s = new S is no longer usable.  However, I can easily declare a
struct S on the stack, or create a new array of S.  In fact, you can do:

auto s = (new S[1])[0];

and achieve the desired effect, but this is oh so ugly.

Bottom line, if I can construct a struct on the stack, I should be able to
identically construct it on the heap.

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