tmap

debug scope(failure) writefln("Unittest Failure :%s(%s) ", __FILE__, __LINE__);
debug scope(success) {writefln("Unittest Success :%s(%s)", __FILE__, __LINE__); stdout.flush();}

auto r1 = [1, 3, 2, 4, 0, 0];
auto s = "abc".dup;
auto tm1 = tmap!("a", "b", (a, b) => b.repeat(a).array().idup)(r1, s);
assert(equal(tm1, [tuple(1, 'a', "a"d),
                   tuple(3, 'b', "bbb"d),
                   tuple(2, 'c', "cc"d)]));

assert(tmap!"a"(r1, s, "").empty);

auto r3 = [1, 2, 3];
//first element of [0] expresses r3 is used as range, but second element expresses "abcd" is not used as range.
auto ss = tmap!("b[a]", [0])(r3, "abcd");
assert(equal(ss, ['b', 'c', 'd'][]));
assert(ss.length == 3);
assert(equal(ss, ss.save));

static assert(isForwardRange!(typeof(ss)));
static assert(!isBidirectionalRange!(typeof(ss)));
static assert(!isRandomAccessRange!(typeof(ss)));

auto ss_b = ss.asBidirectional;
static assert(isBidirectionalRange!(typeof(ss_b)));
static assert(isRandomAccessRange!(typeof(ss_b)));
assert(equal(ss_b.retro, ['d', 'c', 'b']));

///multi function and range-choose test
auto tm5 = tmap!("b[a]", "b[a-1]", [0])(r3, "abcd");
assert(equal(tm5, [tuple('b', 'a'), tuple('c', 'b'), tuple('d', 'c')][]));