On Friday, 31 December 2021 at 00:57:26 UTC, kdevel wrote:
```dptr.d
class R {
}
void foo (R r)
{
}
alias fn = void function (R);
void lyr (fn F) (R r)
{
}
immutable fn foo_ptr = &foo; // line 14
pragma (msg, typeof (foo_ptr));
auto ptr = lyr!(foo_ptr); // line 17
```
dmd reports:
```
immutable(void function(R))
dptr.d(14): Error: expression `& foo` is not a valid template
value argument
```
If I comment out line 17 the code compiles. I want to put the
explicitly instantiated function template into an immutable AA.
How can that be phrased such that dmd compiles it?
Is it okay to use template parameter instead of **template
value** parameter?
```d
class R {
}
void foo (R r)
{
}
void lyr (fp_type, R) (fp_type fp, R r)
{
}
pragma (msg, typeof (&foo));
R r;
void main(){
auto foo_ptr = &foo;
lyr(foo_ptr, r);
}
```
