On 2012-05-06 21:55, Mehrdad wrote:
Is this possible in D2?
i.e. I'm wondering if there is a way to do the object
construction yourself, which would allow you to call the object's
"constructor" (initializer) manually, and just return a pointer
to the new object.
Something along the lines of:
class Window
{
static Window opConstruct(void* ptr)
{
// Assume ptr is already correctly sized and filled
Window result = cast(Window)ptr;
result.__ctor();
return return result;
}
}
It seems like overloading new() *almost* does this, but not
quite: It only lets you allocate the memory, not call the
constructor yourself.
This would be useful, because some objects can have external
constructors (notably when interfacing with C/C++, such as when
using CreateWindow() in Windows), and you *cannot* call these
constructors inside the object's "constructor" (initializer) due
to re-entrancy issues.
You can have a look at my Orange library:
https://github.com/jacob-carlborg/orange/blob/master/orange/util/Reflection.d#L460
It's basically what TypeInfo_Class.create does but it doesn't call the
constructor and works for LDC as well.
https://github.com/D-Programming-Language/druntime/blob/master/src/object_.d#L878
--
/Jacob Carlborg
