[phobos] hasElaborateCopyConstructor()

[Walter Bright]

David Simcha wrote:
>  Is this the correct behavior for hasElaborateCopyConstructor()?

No.

>   Technically it seems to be right according to the documentation, but 
> at the same time it seems substantially less useful.  What users of 
> this template probably really want to know is, "Is this object 
> expensive to copy?".

It means if the copy can be done with a simple memcpy.

>   I guess I also have the same question for hasElaborateAssign.
>
> import std.traits;
>
> struct Postblit {
>     this(this) {}
> }
>
> struct Wrapper {
>     Postblit p;
> }
>
> static assert(hasElaborateCopyConstructor!Postblit);  // Passes
> static assert(hasElaborateCopyConstructor!Wrapper);  // FAILS
>
>
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