On Monday, 9 August 2021 at 19:38:28 UTC, novice2 wrote:
format!"fmt"() and writef!"fmt"() templates
with compile-time checked format string
not accept %X for pointers,
but format() and writef() accept it
https://run.dlang.io/is/aQ05Ux
```
void main() {
import std.stdio: writefln;
int x;
writefln("%X", &x); //ok
writefln!"%s"(&x); //ok
//writefln!"%X"(&x); //compile error
}
```
is this intentional?
Yes. %X is to format integers. Runtime evaluation of a format
string does not allow for type checking. When using the template,
the evaluation can be thorough and the types can be checked
properly. You have 2 solutions for your problem, either a type
cast
writefln!"%X"(cast(size_t)&x);
or using the generic format specifier that will deduce itself the
format to using depending in the passed type.
writefln!"%s"(&x);