Re: Generate a pointer to a method of a struct

[Jack Pope via Digitalmars-d-learn]

On Saturday, 15 October 2022 at 01:48:15 UTC, kdevel wrote:
$ dmd -unittest -main -run ini
ini.d(6): Error: non-constant expression `& bar`
ini.d(7): Error: non-constant expression `& bar`
```
Is this consistent?

I can attest to consistency using ldc. Each of the following 
prevent function address re-assignment:

  immutable string function() f = &S.bar;
  const string function() f = &S.bar;
  enum f = &S.bar;

In contrast, as would be expected, the following has no such 
restriction:

  string function() f = &S.bar;

Example:

  struct S {
    string bar(){return "Hello";}
    string foo(){return "Goodbye";}
  }

  void main() {
    string function() f = &S.bar;
    writeln(f, " ", f());
    f = &S.foo;
    writeln(f, " ", f());
  }