@Override
public int reduce(int identity, IntBinaryOperator op) {
return performOperation(
TerminalFunctions.reduceFunction(identity, op),
true,
(i1, i2) -> op.applyAsInt(i1, i2),
null);
}
@Override
public OptionalInt reduce(IntBinaryOperator op) {
Integer result =
performOperation(
TerminalFunctions.reduceFunction(op),
true,
(i1, i2) -> {
if (i1 != null) {
if (i2 != null) {
return op.applyAsInt(i1, i2);
}
return i1;
}
return i2;
},
null);
if (result == null) {
return OptionalInt.empty();
} else {
return OptionalInt.of(result);
}
}