• Domain (24/24) Sep 06 2018 The following code fail to compile:
• Domain (23/47) Sep 06 2018 Sorry. This works:

Domain <dont_email empty.com> writes:

The following code fail to compile:

enum KeyMod : int
{
     LCtrl  = 1 << 0,
     RCtrl  = 1 << 1,
     Ctrl   = LCtrl | RCtrl,
}

struct Flags(E)
{
public:
     BitFlags!(E, Yes.unsafe) flags;
     alias flags this;

     bool opDispatch(string name)() const
     if (__traits(hasMember, E, name))
     {
         enum e = __traits(getMember, E, name);
         return (mValue & e) != 0;
     }
}

Flags!KeyMod keys;
keys.LCtrl = true;
assert(keys.Ctrl);

Error: no property LCtrl for type Flags!(KeyMod)
Error: no property Ctrl for type Flags!(KeyMod)

Domain <dont_email empty.com> writes:

On Friday, 7 September 2018 at 02:22:58 UTC, Domain wrote:
 The following code fail to compile:

 enum KeyMod : int
 {
     LCtrl  = 1 << 0,
     RCtrl  = 1 << 1,
     Ctrl   = LCtrl | RCtrl,
 }

 struct Flags(E)
 {
 public:
     BitFlags!(E, Yes.unsafe) flags;
     alias flags this;

     bool opDispatch(string name)() const
     if (__traits(hasMember, E, name))
     {
         enum e = __traits(getMember, E, name);
         return (mValue & e) != 0;
     }
 }

 Flags!KeyMod keys;
 keys.LCtrl = true;
 assert(keys.Ctrl);

 Error: no property LCtrl for type Flags!(KeyMod)
 Error: no property Ctrl for type Flags!(KeyMod)

Sorry. This works:

struct Flags(E)
{
public:
     BitFlags!(E, Yes.unsafe) flags;
     alias flags this;

     bool opDispatch(string name)() const
     if (__traits(hasMember, E, name))
     {
         enum e = __traits(getMember, E, name);
         return cast(int)(flags & e) != 0;
     }

     void opDispatch(string name)(bool set)
     if (__traits(hasMember, E, name))
     {
         enum e = __traits(getMember, E, name);
         if (set)
             flags |= e;
         else
             flags &= ~e;
     }
}