Re: Getting all struct members and values with introspection avoiding string mixins

[cc via Digitalmars-d-learn]

On Sunday, 1 May 2016 at 09:42:37 UTC, ParticlePeter wrote:
I am logging arbitrary POD struct types with member names and 
data:

void printStructInfo( T )( T info ) {
  foreach( i, A; typeof( T.tupleof )) {
    enum attribName = T.tupleof[i].stringof;
    writefln( "%s : %s", attribName, mixin( "info." ~ 
attribName ));
  }
}

Is there is some other way to evaluate info.attribName without 
using string mixins?

Cheers, PP

If you have `T info`, T.tupleof[n] will always match up with 
info.tupleof[n].  You can think of `info.tupleof[n]` as being 
rewritten by the compiler in-place as info.whateverFieldThatIs.  
You might try this version (note the double {{ }} with static 
foreach):
```d
void printStructInfo( T )( T info ) {
        static foreach( i, A; info.tupleof ) {{
                enum attribName = T.tupleof[i].stringof;
                writefln( "%s : %s", attribName, info.tupleof[i] );
        }}
}
```

Be advised that T.tupleof and __traits(allMembers, T) return two 
different sets of things.  allMembers will probably get you a lot 
of stuff you don't want and will need to write checks to avoid.  
Using .tupleof is a perfectly acceptable practice.