libstdc++-v3/testsuite/23_containers/vector/nodiscard.cc

   1 // { dg-do compile { target c++17 } }
   2
   3 #include <vector>
   4
   5 void
   6 test_observers(std::vector<int> v)
   7 {
   8   v.size(); // { dg-warning "ignoring return value" }
   9   v.capacity(); // { dg-warning "ignoring return value" }
  10   v.empty(); // { dg-warning "ignoring return value" }
  11 }
  12
  13 void
  14 test_element_access(std::vector<float> v)
  15 {
  16   v.front(); // { dg-warning "ignoring return value" }
  17   v.back();  // { dg-warning "ignoring return value" }
  18   v[1];      // { dg-warning "ignoring return value" }
  19   v.at(1);   // { dg-warning "ignoring return value" }
  20   v.data();  // { dg-warning "ignoring return value" }
  21   const auto& cv = v;
  22   cv[1];     // { dg-warning "ignoring return value" }
  23   cv.at(1);  // { dg-warning "ignoring return value" }
  24   cv.data(); // { dg-warning "ignoring return value" }
  25 }
  26
  27 void
  28 test_rel_ops(std::vector<char> v)
  29 {
  30   v == v; // { dg-warning "ignoring return value" }
  31   v != v; // { dg-warning "ignoring return value" "PR c++/114104" { target c++17_down } }
  32   v < v;  // { dg-warning "ignoring return value" }
  33   v > v;  // { dg-warning "ignoring return value" }
  34   v <= v; // { dg-warning "ignoring return value" }
  35   v >= v; // { dg-warning "ignoring return value" }
  36 }
  37
  38 struct S { };
  39
  40 void
  41 test_iterators(std::vector<S> v)
  42 {
  43   v.begin();  // { dg-warning "ignoring return value" }
  44   v.end();    // { dg-warning "ignoring return value" }
  45   v.rbegin(); // { dg-warning "ignoring return value" }
  46   v.rend();   // { dg-warning "ignoring return value" }
  47   const auto& cv = v;
  48   cv.begin();  // { dg-warning "ignoring return value" }
  49   cv.end();    // { dg-warning "ignoring return value" }
  50   cv.rbegin(); // { dg-warning "ignoring return value" }
  51   cv.rend();   // { dg-warning "ignoring return value" }
  52
  53   v.cbegin();  // { dg-warning "ignoring return value" }
  54   v.cend();    // { dg-warning "ignoring return value" }
  55   v.crbegin(); // { dg-warning "ignoring return value" }
  56   v.crend();   // { dg-warning "ignoring return value" }
  57
  58   auto i = v.begin(), j = v.end();
  59   i == j; // { dg-warning "ignoring return value" }
  60   i != j; // { dg-warning "ignoring return value" "PR c++/114104" { target c++17_down } }
  61   i < j;  // { dg-warning "ignoring return value" }
  62   i > j;  // { dg-warning "ignoring return value" }
  63   i <= j; // { dg-warning "ignoring return value" }
  64   i >= j; // { dg-warning "ignoring return value" }
  65
  66   auto ci = cv.begin(), cj = cv.end();
  67   ci == cj; // { dg-warning "ignoring return value" }
  68   ci != cj; // { dg-warning "ignoring return value" "PR c++/114104" { target c++17_down } }
  69   ci < cj;  // { dg-warning "ignoring return value" }
  70   ci > cj;  // { dg-warning "ignoring return value" }
  71   ci <= cj; // { dg-warning "ignoring return value" }
  72   ci >= cj; // { dg-warning "ignoring return value" }
  73
  74   ci == j; // { dg-warning "ignoring return value" }
  75   ci != j; // { dg-warning "ignoring return value" "PR c++/114104" { target c++17_down } }
  76   ci < j;  // { dg-warning "ignoring return value" }
  77   ci > j;  // { dg-warning "ignoring return value" }
  78   ci <= j; // { dg-warning "ignoring return value" }
  79   ci >= j; // { dg-warning "ignoring return value" }
  80 }
  81
  82 void
  83 test_observers(std::vector<bool> v)
  84 {
  85   v.size(); // { dg-warning "ignoring return value" }
  86   v.capacity(); // { dg-warning "ignoring return value" }
  87   v.empty(); // { dg-warning "ignoring return value" }
  88 }
  89
  90 void
  91 test_element_access(std::vector<bool> v)
  92 {
  93   v.front(); // { dg-warning "ignoring return value" }
  94   v.back();  // { dg-warning "ignoring return value" }
  95   v[1];      // { dg-warning "ignoring return value" }
  96   v.at(1);   // { dg-warning "ignoring return value" }
  97   const auto& cv = v;
  98   cv[1];     // { dg-warning "ignoring return value" }
  99   cv.at(1);  // { dg-warning "ignoring return value" }
 100 }
 101
 102 void
 103 test_rel_ops(std::vector<bool> v)
 104 {
 105   v == v; // { dg-warning "ignoring return value" }
 106   v != v; // { dg-warning "ignoring return value" "PR c++/114104" { target c++17_down } }
 107   v < v;  // { dg-warning "ignoring return value" }
 108   v > v;  // { dg-warning "ignoring return value" }
 109   v <= v; // { dg-warning "ignoring return value" }
 110   v >= v; // { dg-warning "ignoring return value" }
 111 }
 112
 113 void
 114 test_iterators(std::vector<bool> v)
 115 {
 116   v.begin();  // { dg-warning "ignoring return value" }
 117   v.end();    // { dg-warning "ignoring return value" }
 118   v.rbegin(); // { dg-warning "ignoring return value" }
 119   v.rend();   // { dg-warning "ignoring return value" }
 120   const auto& cv = v;
 121   cv.begin();  // { dg-warning "ignoring return value" }
 122   cv.end();    // { dg-warning "ignoring return value" }
 123   cv.rbegin(); // { dg-warning "ignoring return value" }
 124   cv.rend();   // { dg-warning "ignoring return value" }
 125
 126   v.cbegin();  // { dg-warning "ignoring return value" }
 127   v.cend();    // { dg-warning "ignoring return value" }
 128   v.crbegin(); // { dg-warning "ignoring return value" }
 129   v.crend();   // { dg-warning "ignoring return value" }
 130
 131   auto i = v.begin(), j = v.end();
 132   i == j; // { dg-warning "ignoring return value" }
 133   i != j; // { dg-warning "ignoring return value" "PR c++/114104" { target c++17_down } }
 134   i < j;  // { dg-warning "ignoring return value" }
 135   i > j;  // { dg-warning "ignoring return value" }
 136   i <= j; // { dg-warning "ignoring return value" }
 137   i >= j; // { dg-warning "ignoring return value" }
 138
 139   auto ci = cv.begin(), cj = cv.end();
 140   ci == cj; // { dg-warning "ignoring return value" }
 141   ci != cj; // { dg-warning "ignoring return value" "PR c++/114104" { target c++17_down } }
 142   ci < cj;  // { dg-warning "ignoring return value" }
 143   ci > cj;  // { dg-warning "ignoring return value" }
 144   ci <= cj; // { dg-warning "ignoring return value" }
 145   ci >= cj; // { dg-warning "ignoring return value" }
 146
 147   ci == j; // { dg-warning "ignoring return value" }
 148   ci != j; // { dg-warning "ignoring return value" "PR c++/114104" { target c++17_down } }
 149   ci < j;  // { dg-warning "ignoring return value" }
 150   ci > j;  // { dg-warning "ignoring return value" }
 151   ci <= j; // { dg-warning "ignoring return value" }
 152   ci >= j; // { dg-warning "ignoring return value" }
 153 }