Getting all struct members and values with introspection avoiding string mixins

[cc]

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.