Re: using __traits to get line number of a member

[forkit via Digitalmars-d-learn]

On Saturday, 13 November 2021 at 07:20:14 UTC, Ali Çehreli wrote:

It works because we mix-in the value of the string 'm', which 
becomes a symbol.

('foreach' instead of 'static foreach' works as well.)

Ali

Thanks. Really appreciate the help provided in this thread :-)

Final working code below:

//===================================

module test;

import std;

class myClass{ void foo(){}}

void myFunction1(){}

void main()
{
    // list the first user defined member of this module (other 
than main)

    int i;
    foreach(m; __traits(allMembers, mixin(__MODULE__)))
    {
        // ignore these members
        static if(m == "std" || m == "object" || m == "main" || m 
== "_d_run_main" || m == "_Dmain"  )
        {
           i = 1;
           continue;
        }
        else
        {
            writefln("The name of the first user member is: %s", 
m);

            // getLocation returns a tuple. See note below
            writefln("%s begins on line number: %s", m, 
__traits(getLocation, mixin(m))[1]);
        }

        if(i == 1) break;
    }
}


void myFunction2(){}


/*
    https://dlang.org/spec/traits.html#getLocation

    get the location of a symbol where the argument was declared.

    getLocation Returns a tuple(string, int, int) whose entries 
correspond to
    [0] string -> the filename
    [1] int -> line number
    [2] int -> column number
*/

// ======================================