Traits and functions

[Ali Çehreli via Digitalmars-d-learn]

On 01/10/2015 08:21 AM, Bauss wrote:
> Is there a way to get all functions within a module using traits? I
> tried "allMembers" and it seem to work, but I can't use
> "getFunctionAttributes" with it and if I use "getAttributes" then it
> won't find any applied attributes.
>
> What I do is having a package module with a staic constructor which
> loops through "allMembers" and then I want to find functions with a
> specific attribute. All the members are imported using public imports.
> However it can find the specific functions, but it does not find the
> attributes.

The following program prints both the function attributes and user 
defined attributes e.g. of foo():

module deneme;

import std.string;
import std.traits;

struct MyAttr
{}

@MyAttr
void foo(int i, double d) pure @nogc nothrow @property
{}

void main()
{
     foreach (m; __traits(allMembers, deneme)) {
         pragma(msg, format("module member: %s", m));

         static if (mixin ("isCallable!" ~ m)) {
             pragma(msg, format("%s is callable", m));

             foreach (funcAttr;
                      mixin (format("__traits(getFunctionAttributes, 
%s)", m))) {
                 pragma(msg, format("  function attribute: %s", funcAttr));
             }

             foreach (attr; mixin (format("__traits(getAttributes, %s)", 
m))) {
                 static if (is (attr == MyAttr)) {
                     pragma(msg, format("  uda: %s", attr.stringof));
                 }
             }
         }
     }
}

Ali