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

[ParticlePeter via Digitalmars-d-learn]

On Sunday, 1 May 2016 at 10:13:47 UTC, H. S. Teoh wrote:
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

Thanks, I was searching for that!
The given example is a simplification of my code. I do examine 
each member separately and treat accordingly, but eventually used 
the mixin version to get the build-in type values.