2021-11-28 | Paul Boddie | file changeset files shortlog | Introduced support for values that can be allocated on a special thread-local stack, copied around and overwritten/mutated, demonstrating the concept using integer and floating-point numbers. Various complications arise with special attributes (such as __data__) due to the way references are tagged to indicate mutable values, and attribute slots must be cleared in locals, objects and fragments before values are stored since target slots are tested for mutable values. | tagged-address-values |
paul@542 | 1 | s = set() |
paul@542 | 2 | s.add(10) |
paul@542 | 3 | s.add(20) |
paul@542 | 4 | s.add("c") |
paul@542 | 5 | s.add((1, 2)) |
paul@544 | 6 | |
paul@542 | 7 | print "# s:", |
paul@544 | 8 | print s # set([10, 20, "c", (1, 2)) |
paul@544 | 9 | print len(s) # 4 |
paul@544 | 10 | print 10 in s # True |
paul@544 | 11 | print 20 in s # True |
paul@544 | 12 | print "c" in s # True |
paul@544 | 13 | print 30 in s # False |
paul@544 | 14 | print (1, 2) in s # True |
paul@542 | 15 | |
paul@542 | 16 | s2 = set([10, 20, "c", (1, 2)]) |
paul@544 | 17 | |
paul@542 | 18 | print "# s2:", |
paul@544 | 19 | print s2 # set([10, 20, "c", (1, 2)) |
paul@544 | 20 | print len(s2) # 4 |
paul@544 | 21 | print 10 in s2 # True |
paul@544 | 22 | print 20 in s2 # True |
paul@544 | 23 | print "c" in s2 # True |
paul@544 | 24 | print 30 in s2 # False |
paul@544 | 25 | print (1, 2) in s2 # True |
paul@544 | 26 | |
paul@544 | 27 | a = set([1, 3, 5, 7, 9]) |
paul@544 | 28 | b = set([1, 2, 3, 5, 7]) |
paul@544 | 29 | |
paul@544 | 30 | aub = a.union(b) |
paul@544 | 31 | aib = a.intersection(b) |
paul@544 | 32 | adb = a.difference(b) |
paul@544 | 33 | asdb = a.symmetric_difference(b) |
paul@544 | 34 | |
paul@544 | 35 | print len(aub) # 6 |
paul@544 | 36 | print len(aib) # 4 |
paul@544 | 37 | print len(adb) # 1 |
paul@544 | 38 | print len(asdb) # 2 |
paul@544 | 39 | print |
paul@544 | 40 | print 1 in aub # True |
paul@544 | 41 | print 1 in aib # True |
paul@544 | 42 | print 1 in adb # False |
paul@544 | 43 | print 1 in asdb # True |
paul@544 | 44 | print |
paul@544 | 45 | print 2 in aub # True |
paul@544 | 46 | print 2 in aib # False |
paul@544 | 47 | print 2 in adb # False |
paul@544 | 48 | print 2 in asdb # False |
paul@544 | 49 | print |
paul@544 | 50 | print 9 in aub # True |
paul@544 | 51 | print 9 in aib # False |
paul@544 | 52 | print 9 in adb # True |
paul@544 | 53 | print 9 in asdb # False |
paul@549 | 54 | print |
paul@549 | 55 | |
paul@549 | 56 | aub2 = a.copy() |
paul@549 | 57 | aub2.update(b) |
paul@549 | 58 | print len(aub2) # 6 |
paul@549 | 59 | |
paul@549 | 60 | aib2 = a.copy() |
paul@549 | 61 | aib2.intersection_update(b) |
paul@549 | 62 | print len(aib2) # 4 |
paul@549 | 63 | |
paul@549 | 64 | adb2 = a.copy() |
paul@549 | 65 | adb2.difference_update(b) |
paul@549 | 66 | print len(adb2) # 1 |
paul@549 | 67 | |
paul@549 | 68 | asdb2 = a.copy() |
paul@549 | 69 | asdb2.symmetric_difference_update(b) |
paul@549 | 70 | print len(asdb2) # 2 |