clang/test/CXX/expr/expr.prim/expr.prim.lambda/p2.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wno-unused-value %s -verify
   2
   3 // prvalue
   4 void prvalue() {
   5   auto&& x = []()->void { };
   6   auto& y = []()->void { }; // expected-error{{cannot bind to a temporary of type}}
   7 }
   8
   9 namespace std {
  10   class type_info;
  11 }
  12
  13 struct P {
  14   virtual ~P();
  15 };
  16
  17 void unevaluated_operand(P &p, int i) {
  18   int i2 = sizeof([] ()->int { return 0; }()); // expected-error{{lambda expression in an unevaluated operand}}
  19   const std::type_info &ti1 = typeid([&]() -> P& { return p; }());
  20   const std::type_info &ti2 = typeid([&]() -> int { return i; }());  // expected-error{{lambda expression in an unevaluated operand}}
  21 }
  22
  23 template<typename T>
  24 struct Boom {
  25   Boom(const Boom&) {
  26     T* x = 1; // expected-error{{cannot initialize a variable of type 'int *' with an rvalue of type 'int'}} \
  27     // expected-error{{cannot initialize a variable of type 'double *' with an rvalue of type 'int'}}
  28   }
  29   void tickle() const;
  30 };
  31
  32 void odr_used(P &p, Boom<int> boom_int, Boom<float> boom_float,
  33               Boom<double> boom_double) {
  34   const std::type_info &ti1
  35     = typeid([=,&p]() -> P& { boom_int.tickle(); return p; }()); // expected-note{{in instantiation of member function 'Boom<int>::Boom' requested here}}
  36   // This does not cause the instantiation of the Boom copy constructor,
  37   // because the copy-initialization of the capture of boom_float occurs in an
  38   // unevaluated operand.
  39   const std::type_info &ti2
  40     = typeid([=]() -> int { boom_float.tickle(); return 0; }()); // expected-error{{lambda expression in an unevaluated operand}}
  41
  42   auto foo = [=]() -> int { boom_double.tickle(); return 0; }; // expected-note{{in instantiation of member function 'Boom<double>::Boom' requested here}}
  43 }