• via Digitalmars-d-bugs (51/51) Aug 03 2014 https://issues.dlang.org/show_bug.cgi?id=13247

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=13247

          Issue ID: 13247
           Summary: switch doesn't work with pointers to functions. Also
                    casting pointers to functions to integers doesn't work
                    during compilation.
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: DMD
          Assignee: nobody puremagic.com
          Reporter: andrei erdani.com

Consider:

void fun(T)() {}

enum A
{
  _1 = &fun!int,
  _2 = &fun!string,
  _3 = &fun!double,
}

void main(string[] args) {
  A a = A._1;
  final switch (a)
  {
    case A._1: writeln("eh"); break;
    case A._2: writeln("meh"); break;
    case A._3: writeln("neh"); break;
  }
}

The enum works but the switch doesn't. Trying to force to integrals:

void fun(T)() {}

enum A
{
  _1 = cast(size_t) &fun!int,
  _2 = cast(size_t) &fun!string,
  _3 = cast(size_t) &fun!double,
}

void main(string[] args) {
  A a = A._1;
  final switch (a)
  {
    case A._1: writeln("eh"); break;
    case A._2: writeln("meh"); break;
    case A._3: writeln("neh"); break;
  }
}

Now the enum doesn't compile. Would be great if at least one of these worked.

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