Getting all struct members and values with introspection avoiding string mixins

[H. S. Teoh via Digitalmars-d-learn]

On Sun, May 01, 2016 at 09:42:37AM +0000, ParticlePeter via Digitalmars-d-learn 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?
[...]

Using typeof(T.tupleof) seems a bit circuitous. Here's how I'd do it:

	void printStructInfo( T )( T info ) {
		import std.stdio : writefln;
		foreach (memb; __traits(allMembers, T)) {
			writefln("%s: %s", memb,
				__traits(getMember, info, memb));
		}
	}

(For structs that have members other than data fields, you'll need a
static if to filter out non-value members, but this should get you
started.)


T

-- 
2+2=4. 2*2=4. 2^2=4. Therefore, +, *, and ^ are the same operation.