On Sunday, 11 June 2017 at 15:24:30 UTC, Honey wrote:
Doesn't it make sense to introduce another overload of cmp
similar to Steve's doCmp [2] right at that spot?
Moreover, it seems that std.algorithm.cmp should employ three way
comparison as well. The current implementation
int cmp(alias pred = "a < b", R1, R2)(R1 r1, R2 r2)
if (isInputRange!R1 && isInputRange!R2 && !(isSomeString!R1 &&
isSomeString!R2))
{
for (;; r1.popFront(), r2.popFront())
{
if (r1.empty) return -cast(int)!r2.empty;
if (r2.empty) return !r1.empty;
auto a = r1.front, b = r2.front;
if (binaryFun!pred(a, b)) return -1;
if (binaryFun!pred(b, a)) return 1;
}
}
does not seem to be great.
