clang/test/CXX/expr/expr.prim/expr.prim.lambda/p12.cpp

   1 // RUN: %clang_cc1 -std=c++11 %s -Wunused -Wno-unused-but-set-variable -Wno-unused-lambda-capture -verify
   2
   3 void odr_used() {
   4   int i = 17;
   5   [i]{}();
   6 }
   7
   8 struct ReachingThis {
   9   static void static_foo() {
  10     (void)[this](){}; // expected-error{{'this' cannot be captured in this context}}
  11
  12     struct Local {
  13       int i;
  14
  15       void bar() {
  16         (void)[this](){};
  17         (void)[&](){i = 7; };
  18       }
  19     };
  20   }
  21
  22   void foo() {
  23     (void)[this](){};
  24
  25     struct Local {
  26       int i;
  27
  28       static void static_bar() {
  29         (void)[this](){}; // expected-error{{'this' cannot be captured in this context}}
  30         (void)[&](){i = 7; }; // expected-error{{invalid use of member 'i' in static member function}}
  31       }
  32     };
  33   }
  34 };
  35
  36 void immediately_enclosing(int i) { // expected-note{{'i' declared here}}
  37   [i]() {
  38     [i] {}();
  39   }();
  40
  41   [=]() {
  42     [i] {}();
  43   }();
  44
  45   []() {      // expected-note{{lambda expression begins here}} expected-note 2 {{capture 'i' by}} expected-note 2 {{default capture by}}
  46     [i] {}(); // expected-error{{variable 'i' cannot be implicitly captured in a lambda with no capture-default specified}}
  47   }();
  48 }
  49
  50 void f1(int i) { // expected-note{{declared here}}
  51   int const N = 20;
  52   auto m1 = [=]{
  53     int const M = 30;
  54     auto m2 = [i]{
  55       int x[N][M];
  56       x[0][0] = i;
  57     };
  58     (void)N;
  59     (void)M;
  60     (void)m2;
  61   };
  62   struct s1 {
  63     int f;
  64     void work(int n) { // expected-note{{declared here}}
  65       int m = n*n;
  66       int j = 40; // expected-note{{declared here}}
  67       auto m3 = [this, m] { // expected-note 3{{lambda expression begins here}} expected-note 2 {{capture 'i' by}} expected-note 2 {{capture 'j' by}} expected-note 2 {{capture 'n' by}}
  68         auto m4 = [&,j] { // expected-error{{variable 'j' cannot be implicitly captured in a lambda with no capture-default specified}}
  69           int x = n; // expected-error{{variable 'n' cannot be implicitly captured in a lambda with no capture-default specified}}
  70           x += m;
  71           x += i; // expected-error{{variable 'i' cannot be implicitly captured in a lambda with no capture-default specified}}
  72           x += f;
  73         };
  74       };
  75     }
  76   };
  77 }