Re: How get struct value by member name string ?

[John Xu via Digitalmars-d-learn]

On Thursday, 1 June 2023 at 15:38:08 UTC, Steven Schveighoffer 
wrote:
On 5/31/23 12:08 AM, John Xu wrote:


When render vibe.d diet template,

     string[] allMembers = __traits(allMembers, t);

enum allMembers = __traits(allMembers, t);

     res.render!("index.dt", t, allMembers)

if I don't want write memberName one by one in diet template:

     table
         - foreach(memberName; allMembers)
             tr
                 td #{memberName}
                 td #{getTMember!memberName(t)}

Problem: memberName is not known at compile time.

The problem is that you stored the member name list as a 
runtime variable, and that is not known at compile time. Try 
the enum.

Or really, just `foreach(memberName; __traits(allMembers, t))` 
right in the diet template.

-Steve

Ok, thanks for all you gentlemen's help. I tried following 
function,
now it works like C/C++/Python way:

    string getTMember(T t, string columnName) {
        foreach(member; __traits(allMembers, T)){
            if (member == columnName) {
                return __traits(getMember, mcu, member).to!string;
            }
        }
        return "";
    }