On Sunday, 14 April 2013 at 08:03:16 UTC, Timon Gehr wrote:
On 04/14/2013 02:48 AM, Ali Çehreli wrote:
When immutable constructors are implemented, will there be a
difference
between the two syntaxes below?
struct MyStruct
{
int i;
// ... assume that MyStruct has both
// mutable and immutable constructors ...
}
auto s0 = immutable(MyStruct)("some parameter");
immutable s1 = MyStruct("some parameter");
The former syntax constructs an immutable literal, so the type
of s0 is
deduced to be immutable.
The latter syntax constructs a mutable literal and blits it to
the
immutable s1.
Should the former syntax call the immutable constructor and
the latter
syntax call the mutable constructor?
Ali
I guess so. But it does not really make sense to declare an
immutable constructor if the struct instances implicitly
convert between mutable and immutable.
I was about to answer exactly the same.
Note that s1 should fail is immutable => mutable conversion can't
be done implicitly (if MyStruct contains references).
