tests/bounded_ptr_src/arith.add.cpp

   1 //
   2 // Tests for
   3 //  friend bounded_ptr operator+(bounded_ptr p, std::ptrdiff_t n);
   4 //  friend bounded_ptr operator+(std::ptrdiff_t n, bounded_ptr p);
   5 //
   6 // The heavy lifting is done in operator+=, so we only check basic functioning.
   7 //
   8
   9 #include <libkern/c++/bounded_ptr.h>
  10 #include <array>
  11 #include <darwintest.h>
  12 #include <darwintest_utils.h>
  13 #include "test_utils.h"
  14
  15 #define _assert(...) T_ASSERT_TRUE((__VA_ARGS__), # __VA_ARGS__)
  16
  17 struct T {
  18         int i;
  19 };
  20
  21 template <typename T, typename QualT>
  22 static void
  23 tests()
  24 {
  25         std::array<T, 5> array = {T{0}, T{1}, T{2}, T{3}, T{4}};
  26
  27         // Add positive offsets
  28         // T{0}     T{1}     T{2}     T{3}     T{4}     <one-past-last>
  29         //   ^                                                ^
  30         //   |                                                |
  31         // begin, ptr                                        end
  32         {
  33                 test_bounded_ptr<QualT> const ptr(array.begin(), array.begin(), array.end());
  34
  35                 {
  36                         test_bounded_ptr<QualT> res = ptr + 0;
  37                         _assert(&*res == &array[0]);
  38                 }
  39                 {
  40                         test_bounded_ptr<QualT> res = ptr + 1;
  41                         _assert(&*res == &array[1]);
  42                 }
  43                 {
  44                         test_bounded_ptr<QualT> res = ptr + 2;
  45                         _assert(&*res == &array[2]);
  46                 }
  47                 {
  48                         test_bounded_ptr<QualT> res = ptr + 3;
  49                         _assert(&*res == &array[3]);
  50                 }
  51                 {
  52                         test_bounded_ptr<QualT> res = ptr + 4;
  53                         _assert(&*res == &array[4]);
  54                 }
  55                 {
  56                         test_bounded_ptr<QualT> res = ptr + 5;
  57                         _assert(res == array.end());
  58                 }
  59         }
  60
  61         // Add negative offsets
  62         // T{0}     T{1}     T{2}     T{3}     T{4}     <one-past-last>
  63         //   ^                                                ^
  64         //   |                                                |
  65         // begin                                           end,ptr
  66         {
  67                 test_bounded_ptr<QualT> const ptr(array.end(), array.begin(), array.end());
  68
  69                 {
  70                         test_bounded_ptr<QualT> res = ptr + 0;
  71                         _assert(res == array.end());
  72                 }
  73                 {
  74                         test_bounded_ptr<QualT> res = ptr + -1;
  75                         _assert(&*res == &array[4]);
  76                 }
  77                 {
  78                         test_bounded_ptr<QualT> res = ptr + -2;
  79                         _assert(&*res == &array[3]);
  80                 }
  81                 {
  82                         test_bounded_ptr<QualT> res = ptr + -3;
  83                         _assert(&*res == &array[2]);
  84                 }
  85                 {
  86                         test_bounded_ptr<QualT> res = ptr + -4;
  87                         _assert(&*res == &array[1]);
  88                 }
  89                 {
  90                         test_bounded_ptr<QualT> res = ptr + -5;
  91                         _assert(&*res == &array[0]);
  92                 }
  93         }
  94
  95         // Make sure the original pointer isn't modified
  96         {
  97                 test_bounded_ptr<QualT> const ptr(array.begin() + 1, array.begin(), array.end());
  98                 (void)(ptr + 3);
  99                 _assert(&*ptr == &array[1]);
 100         }
 101
 102         // Make sure the operator is commutative
 103         {
 104                 {
 105                         test_bounded_ptr<QualT> const ptr(array.begin(), array.begin(), array.end());
 106                         test_bounded_ptr<QualT> res = 0 + ptr;
 107                         _assert(&*res == &array[0]);
 108                 }
 109                 {
 110                         test_bounded_ptr<QualT> const ptr(array.begin(), array.begin(), array.end());
 111                         test_bounded_ptr<QualT> res = 3 + ptr;
 112                         _assert(&*res == &array[3]);
 113                 }
 114                 {
 115                         test_bounded_ptr<QualT> const ptr(array.begin() + 3, array.begin(), array.end());
 116                         test_bounded_ptr<QualT> res = -2 + ptr;
 117                         _assert(&*res == &array[1]);
 118                 }
 119         }
 120 }
 121
 122 T_DECL(arith_add, "bounded_ptr.arith.add") {
 123         tests<T, T>();
 124         tests<T, T const>();
 125         tests<T, T volatile>();
 126         tests<T, T const volatile>();
 127 }