• Newbie2019 (24/24) Jul 30 2019 I need to check on struct members is match a delegate type. for
• Newbie2019 (6/16) Jul 30 2019 foreach(int name_index, name; __traits(allMembers, S) ) static
• Newbie2019 (8/13) Jul 30 2019 And one more question, how to get the Function address or

Newbie2019 <newbie2019 gmail.com> writes:

I need to check on struct members is match a delegate type.  for 
example;

alias Type = scope void delegate(int)  nogc  ;
struct S {
      void onMatch1(int) scope  nogc {
     }

      void onNotMatch2(int) scope  {
     }

     void onNotMatch2(int, int) scope  nogc {
     }

      Type not_match3;
}

please notify not_match3 member is should return false, I try 
this template but not work:



template isDelegateMember(S, string name, D) if(is(S == struct) 
&& __traits(hasMember, S, name) && is( D == delegate ) ) {
     alias Fn    = typeof( __traits(getMember, S.init, name) );
     static assert( isFunction!Fn );
     pragma(msg, D);
     pragma(msg, typeof(D.init.funcptr));
     pragma(msg, Fn );
     pragma(msg, __traits(isSame, Fn, typeof(D.init.funcptr)) );
     enum isDelegateMember = is( Fn == typeof(D.init.funcptr) ) ;
}

Newbie2019 <newbie2019 gmail.com> writes:

On Tuesday, 30 July 2019 at 10:06:21 UTC, Newbie2019 wrote:
 template isDelegateMember(S, string name, D) if(is(S == struct) 
 && __traits(hasMember, S, name) && is( D == delegate ) ) {
     alias Fn    = typeof( __traits(getMember, S.init, name) );
     static assert( isFunction!Fn );
     pragma(msg, D);
     pragma(msg, typeof(D.init.funcptr));
     pragma(msg, Fn );
     pragma(msg, __traits(isSame, Fn, typeof(D.init.funcptr)) );
     enum isDelegateMember = is( Fn == typeof(D.init.funcptr) ) ;
 }


foreach(int name_index, name; __traits(allMembers, S) ) static 
if( isDelegateMember!(S, name, Type) ) {
     enum Rules = getUDAs!( __traits(getMember, S, name) , Rule);
      // handle the member is match this rules.
}

Newbie2019 <newbie2019 gmail.com> writes:

On Tuesday, 30 July 2019 at 10:08:55 UTC, Newbie2019 wrote:
 foreach(int name_index, name; __traits(allMembers, S) ) static 
 if( isDelegateMember!(S, name, Type) ) {
     enum Rules = getUDAs!( __traits(getMember, S, name) , Rule);
      // handle the member is match this rules.
 }


And one more question, how to get the Function address or 
delegate address of a struct member
  on compile time ?

struct S {
     void onMatch(){}
}


__gshared auto onMatch = (&(S.init)).funcptr ;  // this not work