On Sunday, 6 October 2013 at 13:11:02 UTC, Andrej Mitrovic wrote:
> On 10/6/13, Namespace <rswhite4@googlemail.com> wrote:
>> And I should write a blog post about your and my solution. :)
>
> Let me try to hack on __PRETTY_FUNCTION__ first and I'll post a
> working example here soon.

Is there something new?

On Friday, 11 October 2013 at 22:39:18 UTC, Namespace wrote:
> On Sunday, 6 October 2013 at 13:11:02 UTC, Andrej Mitrovic wrote:
>> On 10/6/13, Namespace <rswhite4@googlemail.com> wrote:
>>> And I should write a blog post about your and my solution. :)
>>
>> Let me try to hack on __PRETTY_FUNCTION__ first and I'll post a
>> working example here soon.
>
> Is there something new?

I have.

Foo_1:
----
import std.stdio;

import Bar_1;

struct friend(T) {
public:
	alias Friend = T;
}

@friend!(Bar)
class Foo {
public:
	void call(Bar b) {
		_call_a_friend(b, this, &b.bar, 42);
		//b.bar(42);
	}
}
----

Bar_1:
----
import std.stdio;
import std.string : format;

class Bar {
package:
	void bar(int id) {
		writeln("Bar.bar with ", id);
	}
}

void _call_a_friend(F, T, string filename = __FILE__, size_t line = __LINE__, Args...)(const F friend, const T caller, void delegate(Args) dg, Args args) {
	bool isFriend = false;

	foreach (attr; __traits(getAttributes, T)) {
		isFriend = is(attr.Friend) && is(attr.Friend == F);
		if (isFriend)
			break;
	}

	//writeln(isFriend);

	if (isFriend)
		dg(args);
	else
		throw new Exception(format("%s is not a friend of %s.", __traits(identifier, T), __traits(identifier, F)), filename, line);
}
----

main:
----
import Foo_1;
import Bar_1;

void main() {
	Foo f = new Foo();
	Bar b = new Bar();

	f.call(b);
}
----

I have to admit that the '_call_a_friend' method is a bit parameter heavy. :D
Suggestions?