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object Test {
def time[U](b: =>U): Long = {
val start = System.currentTimeMillis
b
val end = System.currentTimeMillis
end - start
}
def main(args: Array[String]) {
val sz = 1000000000
val range = 1 to sz
check { assert(range.min == 1, range.min) }
check { assert(range.max == sz, range.max) }
val descending = sz to 1 by -1
check { assert(descending.min == 1) }
check { assert(descending.max == sz) }
val numeric = 1.0 to sz.toDouble by 1
check { assert(numeric.min == 1.0) }
check { assert(numeric.max == sz.toDouble) }
val numdesc = sz.toDouble to 1.0 by -1
check { assert(numdesc.min == 1.0) }
check { assert(numdesc.max == sz.toDouble) }
}
def check[U](b: =>U) {
val exectime = time {
b
}
// whatever it is, it should be less than, say, 250ms
// if `max` involves traversal, it takes over 5 seconds on a 3.2GHz i7 CPU
//println(exectime)
assert(exectime < 250, exectime)
}
}
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