p5.cpp revision 793cd1c4cdfaafc52e2c2ad9dae959befe4bb166 
1// RUN: %clang_cc1 -std=c++11 %s -Winvalid-noreturn -verify
2
3// An attribute-specifier-seq in a lambda-declarator appertains to the
4// type of the corresponding function call operator.
5void test_attributes() {
6  auto nrl = [](int x) -> int { if (x > 0) return x; }; // expected-warning{{control may reach end of non-void lambda}}
7
8  auto nrl2 = []() [[noreturn]] { return; }; // expected-error{{lambda declared 'noreturn' should not return}}
9}
10
11template<typename T>
12struct bogus_override_if_virtual : public T {
13  bogus_override_if_virtual() : T(*(T*)0) { }
14  int operator()() const;
15};
16
17void test_quals() {
18  // This function call operator is declared const (9.3.1) if and only
19  // if the lambda- expression's parameter-declaration-clause is not
20  // followed by mutable.
21  auto l = [=](){}; // expected-note{{method is not marked volatile}}
22  const decltype(l) lc = l;
23  l();
24  lc();
25
26  auto ml = [=]() mutable{}; // expected-note{{method is not marked const}} \
27                             // expected-note{{method is not marked volatile}}
28  const decltype(ml) mlc = ml;
29  ml();
30  mlc(); // expected-error{{no matching function for call to object of type}}
31
32  // It is neither virtual nor declared volatile.
33  volatile decltype(l) lv = l;
34  volatile decltype(ml) mlv = ml;
35  lv(); // expected-error{{no matching function for call to object of type}}
36  mlv(); // expected-error{{no matching function for call to object of type}}
37
38  bogus_override_if_virtual<decltype(l)> bogus;
39}
40
41// Default arguments (8.3.6) shall not be specified in the
42// parameter-declaration-clause of a lambda- declarator.
43// Note: Removed by core issue 974.
44int test_default_args() {
45  return [](int i = 5,  // expected-warning{{C++11 forbids default arguments for lambda expressions}}
46            int j = 17) { return i+j;}(5, 6);
47}
48
49// Any exception-specification specified on a lambda-expression
50// applies to the corresponding function call operator.
51void test_exception_spec() {
52  auto tl1 = []() throw(int) {};
53  auto tl2 = []() {};
54  static_assert(!noexcept(tl1()), "lambda can throw");
55  static_assert(!noexcept(tl2()), "lambda can throw");
56
57  auto ntl1 = []() throw() {};
58  auto ntl2 = []() noexcept(true) {};
59  auto ntl3 = []() noexcept {};
60  static_assert(noexcept(ntl1()), "lambda cannot throw");
61  static_assert(noexcept(ntl2()), "lambda cannot throw");
62  static_assert(noexcept(ntl3()), "lambda cannot throw");
63}
64
65