xref: /llvm-project/clang/test/CXX/expr/expr.prim/expr.prim.lambda/p2.cpp (revision c38498f0469aba6a0fb63d99ad398cdf788c5696)

// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wno-unused-value %s -verify

// prvalue
void prvalue() {
  auto&& x = []()->void { };
  auto& y = []()->void { }; // expected-error{{cannot bind to a temporary of type}}
}

namespace std {
  class type_info;
}

struct P {
  virtual ~P();
};

void unevaluated_operand(P &p, int i) {
  int i2 = sizeof([] ()->int { return 0; }()); // expected-error{{lambda expression in an unevaluated operand}}
  const std::type_info &ti1 = typeid([&]() -> P& { return p; }());
  const std::type_info &ti2 = typeid([&]() -> int { return i; }());  // expected-error{{lambda expression in an unevaluated operand}}
}

template<typename T>
struct Boom {
  Boom(const Boom&) {
    T* x = 1; // expected-error{{cannot initialize a variable of type 'int *' with an rvalue of type 'int'}} \
    // expected-error{{cannot initialize a variable of type 'double *' with an rvalue of type 'int'}}
  }
  void tickle() const;
};

void odr_used(P &p, Boom<int> boom_int, Boom<float> boom_float,
              Boom<double> boom_double) {
  const std::type_info &ti1
    = typeid([=,&p]() -> P& { boom_int.tickle(); return p; }()); // expected-note{{in instantiation of member function 'Boom<int>::Boom' requested here}}
  // This does not cause the instantiation of the Boom copy constructor,
  // because the copy-initialization of the capture of boom_float occurs in an
  // unevaluated operand.
  const std::type_info &ti2
    = typeid([=]() -> int { boom_float.tickle(); return 0; }()); // expected-error{{lambda expression in an unevaluated operand}}

  auto foo = [=]() -> int { boom_double.tickle(); return 0; }; // expected-note{{in instantiation of member function 'Boom<double>::Boom' requested here}}
}