clang/test/SemaCXX/captured-statements.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s -fblocks
   2
   3 void test_nest_lambda() {
   4   int x;
   5   int y;
   6   [&,y]() {
   7     int z;
   8     #pragma clang __debug captured
   9     {
  10       x = y; // OK
  11       y = z; // expected-error{{cannot assign to a variable captured by copy in a non-mutable lambda}}
  12       z = y; // OK
  13     }
  14   }();
  15
  16   int a;
  17   #pragma clang __debug captured
  18   {
  19     int b;
  20     int c;
  21     [&,c]() {
  22       a = b; // OK
  23       b = c; // OK
  24       c = a; // expected-error{{cannot assign to a variable captured by copy in a non-mutable lambda}}
  25     }();
  26   }
  27 }
  28
  29 class test_obj_capture {
  30   int a;
  31   void b();
  32   static void test() {
  33     test_obj_capture c;
  34     #pragma clang __debug captured
  35     { (void)c.a; }  // OK
  36     #pragma clang __debug captured
  37     { c.b(); }      // OK
  38   }
  39 };
  40
  41 class test_this_capture {
  42   int a;
  43   void b();
  44   void test() {
  45     #pragma clang __debug captured
  46     { (void)this; } // OK
  47     #pragma clang __debug captured
  48     { (void)a; }    // OK
  49     #pragma clang __debug captured
  50     { b(); }        // OK
  51   }
  52 };
  53
  54 template <typename T>
  55 void template_capture_var() {
  56   T x; // expected-error{{declaration of reference variable 'x' requires an initializer}}
  57   #pragma clang _debug captured
  58   {
  59     (void)x;
  60   }
  61 }
  62
  63 template <typename T>
  64 class Val {
  65   T v;
  66 public:
  67   void set(const T &v0) {
  68     #pragma clang __debug captured
  69     {
  70       v = v0;
  71     }
  72   }
  73 };
  74
  75 void test_capture_var() {
  76   template_capture_var<int>(); // OK
  77   template_capture_var<int&>(); // expected-note{{in instantiation of function template specialization 'template_capture_var<int &>' requested here}}
  78
  79   Val<float> Obj;
  80   Obj.set(0.0f); // OK
  81 }
  82
  83 template <typename S, typename T>
  84 S template_capture_var(S x, T y) {  // expected-note{{variable 'y' declared const here}}
  85   #pragma clang _debug captured
  86   {
  87     x++;
  88     y++;  // expected-error{{cannot assign to variable 'y' with const-qualified type 'const int'}}
  89   }
  90
  91   return x;
  92 }
  93
  94 // Check if can recover from a template error.
  95 void test_capture_var_error() {
  96   template_capture_var<int, int>(0, 1); // OK
  97   template_capture_var<int, const int>(0, 1); // expected-note{{in instantiation of function template specialization 'template_capture_var<int, const int>' requested here}}
  98   template_capture_var<int, int>(0, 1); // OK
  99 }
 100
 101 template <typename T>
 102 void template_capture_in_lambda() {
 103   T x, y;
 104   [=, &y]() {
 105     #pragma clang __debug captured
 106     {
 107       y += x;
 108     }
 109   }();
 110 }
 111
 112 void test_lambda() {
 113   template_capture_in_lambda<int>(); // OK
 114 }
 115
 116 struct Foo {
 117   void foo() { }
 118   static void bar() { }
 119 };
 120
 121 template <typename T>
 122 void template_capture_func(T &t) {
 123   #pragma clang __debug captured
 124   {
 125     t.foo();
 126   }
 127
 128   #pragma clang __debug captured
 129   {
 130     T::bar();
 131   }
 132 }
 133
 134 void test_template_capture_func() {
 135   Foo Obj;
 136   template_capture_func(Obj);
 137 }
 138
 139 template <typename T>
 140 T captured_sum(const T &a, const T &b) {
 141   T result;
 142
 143   #pragma clang __debug captured
 144   {
 145     result = a + b;
 146   }
 147
 148   return result;
 149 }
 150
 151 template <typename T, typename... Args>
 152 T captured_sum(const T &a, const Args&... args) {
 153   T result;
 154
 155   #pragma clang __debug captured
 156   {
 157     result = a + captured_sum(args...);
 158   }
 159
 160   return result;
 161 }
 162
 163 void test_capture_variadic() {
 164   (void)captured_sum(1, 2, 3); // OK
 165   (void)captured_sum(1, 2, 3, 4, 5); // OK
 166 }
 167
 168 void test_capture_with_attributes() {
 169   [[]] // expected-error {{an attribute list cannot appear here}}
 170   #pragma clang __debug captured
 171   {
 172   }
 173 }