On 01/08/18 17:13, Steven Schveighoffer wrote:
On 8/1/18 3:59 AM, Shachar Shemesh wrote:
Thank you! Finally!
Let me just state, for the record, that having *yet another* syntax
special case is just appalling.
The lazy variadic thing is a distinction between specifying variadic
lazy parameters and a lazy variadic array. The distinction is so
miniscule, but necessary to have a disambiguous syntax.
But I had actually thought for a while, that you could simply specify a
delegate, and it would be treated as a lazy parameter, which would
probably solve your problem. I really think this syntax should be
available.
With that said, I was hoping that specifying it explicitly as a
delegate would allow me to scope it. Apparently, that doesn't work :-(
I guess you mean you can't scope the delegates? I'm surprised if that
doesn't work.
-Steve
import std.string;
alias Dg = string delegate() @nogc nothrow;
void myAssert(bool cond, scope Dg[1] msg_dg ...) @nogc nothrow
{
import core.stdc.stdio;
if (!cond)
{
string msg = msg_dg[0]();
printf("%*s\n", msg.length, msg.ptr);
}
}
void main() @nogc {
string msg = "Hello";
myAssert(true, msg); // <- errors on this line
}
It errors out: complains it needs to allocate main's frame on the GC,
but main is @nogc. The same happens if I move the scope to the alias.
