On Thursday, 11 April 2019 at 18:13:48 UTC, Alex wrote:
The following code works when I comment out the static if
//static if (__traits(compiles, __traits(getAttributes, T)))
static foreach(a; __traits(getAttributes, T)) Attributes ~=
There seems to be absolutely no reason why this code would fail
with the static if but pass without it but in the first case I
get no attributes because the __traits compiles fails.
__traits(compiles, __traits(getAttributes, T))
vs
__traits(getAttributes, T)
How could it not compile in the first case and yet work in the
foreach?
T is a local variable name passed to this code, which does
generally return an
error when used in certain ways:
int x;
Code!x; // Basically the code at the top
if I try to do too much with x I get `cannot use local `x` as a
parameter to a non-global template`. Usually when I try to pass
T to another template I get this error.
But some things work. But I can't for the life of me understand
why compiles is failing but the foreach loop is working.
The problem is that I am using compiles quite often and either
I'm misusing it or it's got some bugs in it that worry me
because maybe they are silently failing?
Note that I get no errors in my code and I do get the
attributes so it is technically working.
It would be really nice to know why the compiles is failing,
e.g.,
pragma(compilesmsg, __traits(getAttributes, T)) spits out the
error.
Must be something else in your code because it works fine for me
with this shortened example.
https://run.dlang.io/is/o8xESB
