• Andrej Mitrovic <andrej.mitrovich gmail.com> Sep 24 2011
• travert phare.normalesup.org (Christophe) Sep 26 2011

Andrej Mitrovic <andrej.mitrovich gmail.com> writes:

I want to use this in my unittests:

assert(allEqual(Foo(1), obj1, obj2, obj3));

How would you implement a function like allEqual(needle, objects...) ?
Maybe via reduce?

travert phare.normalesup.org (Christophe) writes:

Andrej Mitrovic , dans le message (digitalmars.D.learn:29755), a écrit :
 I want to use this in my unittests:
 
 assert(allEqual(Foo(1), obj1, obj2, obj3));
 
 How would you implement a function like allEqual(needle, objects...) ?
 Maybe via reduce?



I would use find. (the code was not compiled/tested at all)

bool allEqual(R)(R r) if (isInputRange!R)
{
    auto a = r.front;
    r.popFront();
    return find!(b){return a!=b;}(r).empty;
}


and direct '==' operator for tuples:

bool allEqual(T...)(T t)
{
    return t[0] == t[1] && allEqual(t[0], t[2..$]);
}

with an appropriate filter if I want to make something nice.


-- 
Christophe