On Saturday, 27 April 2013 at 11:37:38 UTC, Tavi Cacina wrote:
is it a bug the fact that a Variant may be initialized with a
struct bigger than 32 bytes? Even if this does function, it is
not consistent because you can not assign such an 'inflated'
variant to another one, assertion. This affects the max size of
a std.concurrency message (right now it is not specified that
such restriction exists)
---
import std.variant;
struct S
{
int[9] s;
}
void main()
{
Variant v1, v2; // maximum size 32 bytes
v1 = S(); // works, even if sizeof(S) > 32
v2 = v1; // AssertError: target must be non-null
}
---
There used to be a maximum size check for placing things in
variants, but it was removed back in 2009:
https://github.com/D-Programming-Language/phobos/commit/0c142994d9b5cb9f379eca28f3a625c749370e4a#L20L189
The way it works now, is that if the size is too big they use a
reference instead:
https://github.com/D-Programming-Language/phobos/blob/master/std/variant.d#L544#L555
