std.mixins

[Philippe Sigaud]

On Wed, Sep 1, 2010 at 15:25, Simen kjaeraas <simen.kjaras at gmail.com> wrote:

> Philippe Sigaud <philippe.sigaud at gmail.com> wrote:
>
>  I also have a template that gets the list of all members of an aggregate
>> type (classes, structs and, well, modules, in a way), even the
>> constructors,
>> even the overloaded members, separated by type, and list them with their
>> names and associated type. It even gets the types aliases and unittests,
>> though I don't know what to do with the latter. That was part of a project
>> to duplicate a type: generate a new type with this extracted info. I had
>> vague projects to transform the methods into their const equivalent for
>> example or to render the fields immutable, but didn't get that far. Would
>> that be interesting to someone?
>>
>
> I could imagine extracting the unittests could be useful for making a
> unittest system. Are they only included when passing -unittest?
>

Hmm, don't know. Let see:

import std.stdio;

class C
{
    int i;
    unittest
    {
        assert(true);
        writeln("Hello World!");
    }
}

void main() {

    writeln([__traits(allMembers, C)]);
    writeln(typeof(C.__unittest1()).stringof);
    C.__unittest1();
}

No, compile this with and without -unittest, and __unittest1 is present. Oh,
btw, contrary to the docs __traits(getOverloads, T) works also for structs
and modules, not only classes.

The unittests type is void delegate(), which is coherent with them being
blocks of instructions. You can even call it like a function (see the last
line of main).
Strange, I never could get that to work... Maybe I didn't try this with a
class.


Philippe
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