Re: Concepts like c++20 with specialized overload resolution.

[ryuukk_ via Digitalmars-d-learn]

On Saturday, 27 May 2023 at 13:23:38 UTC, vushu wrote:

you can use: ``static if (__traits(hasMember, T, "magma"))``


```D
import std;

struct LavaMan {
  void magma() { writeln(" LavaMan is throwing LAVA"); }
}

struct FakeVulcano {
  void try_making_lava() { writeln( " Making fake lava"); }
}


// all the magic
void make_lava(T)(ref T lava_thing){
    static if (__traits(hasMember, T, "magma"))
        lava_thing.magma();
    else
        lava_thing.try_making_lava();
}

int main() {
  LavaMan v;
  FakeVulcano l;
  make_lava(l);
  make_lava(v);
  return 0;
}
```

```
 Making fake lava
 LavaMan is throwing LAVA
```