1 // RUN: %clang_cc1 -std=c++1y %s -verify 2 3 const char *has_no_member = [x("hello")] {}.x; // expected-error {{no member named 'x'}} 4 5 double f; 6 auto with_float = [f(1.0f)] { 7 using T = decltype(f); 8 using T = float; 9 }; 10 auto with_float_2 = [&f(f)] { // ok, refers to outer f 11 using T = decltype(f); 12 using T = double&; 13 }; 14 15 // Within the lambda-expression's compound-statement, 16 // the identifier in the init-capture hides any declaration 17 // of the same name in scopes enclosing the lambda-expression. 18 void hiding() { 19 char c; 20 (void) [c("foo")] { 21 static_assert(sizeof(c) == sizeof(const char*), ""); 22 }; 23 (void) [c("bar")] () -> decltype(c) { // outer c, not init-capture 24 return "baz"; // expected-error {{cannot initialize}} 25 }; 26 } 27 28 struct ExplicitCopy { 29 ExplicitCopy(); // expected-note 2{{not viable}} 30 explicit ExplicitCopy(const ExplicitCopy&); 31 }; 32 auto init_kind_1 = [ec(ExplicitCopy())] {}; 33 auto init_kind_2 = [ec = ExplicitCopy()] {}; // expected-error {{no matching constructor}} 34 35 template<typename T> void init_kind_template() { 36 auto init_kind_1 = [ec(T())] {}; 37 auto init_kind_2 = [ec = T()] {}; // expected-error {{no matching constructor}} 38 } 39 template void init_kind_template<int>(); 40 template void init_kind_template<ExplicitCopy>(); // expected-note {{instantiation of}} 41 42 void void_fn(); 43 int overload_fn(); 44 int overload_fn(int); 45 46 auto bad_init_1 = [a()] {}; // expected-error {{expected expression}} 47 auto bad_init_2 = [a(1, 2)] {}; // expected-error {{initializer for lambda capture 'a' contains multiple expressions}} 48 auto bad_init_3 = [&a(void_fn())] {}; // expected-error {{cannot form a reference to 'void'}} 49 auto bad_init_4 = [a(void_fn())] {}; // expected-error {{has incomplete type 'void'}} 50 auto bad_init_5 = [a(overload_fn)] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer of type '<overloaded function}} 51 auto bad_init_6 = [a{overload_fn}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer list}} 52 auto bad_init_7 = [a{{1}}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from nested initializer list}} 53 54 template<typename...T> void pack_1(T...t) { (void)[a(t...)] {}; } // expected-error {{initializer missing for lambda capture 'a'}} 55 template void pack_1<>(); // expected-note {{instantiation of}} 56 57 // FIXME: Might need lifetime extension for the temporary here. 58 // See DR1695. 59 auto a = [a(4), b = 5, &c = static_cast<const int&&>(0)] { 60 static_assert(sizeof(a) == sizeof(int), ""); 61 static_assert(sizeof(b) == sizeof(int), ""); 62 using T = decltype(c); 63 using T = const int &; 64 }; 65 auto b = [a{0}] {}; // OK, per N3922 66 67 struct S { S(); S(S&&); }; 68 template<typename T> struct remove_reference { typedef T type; }; 69 template<typename T> struct remove_reference<T&> { typedef T type; }; 70 template<typename T> decltype(auto) move(T &&t) { return static_cast<typename remove_reference<T>::type&&>(t); } 71 auto s = [s(move(S()))] {}; 72 73 template<typename T> T instantiate_test(T t) { 74 [x(&t)]() { *x = 1; } (); // expected-error {{assigning to 'const char *'}} 75 return t; 76 } 77 int instantiate_test_1 = instantiate_test(0); 78 const char *instantiate_test_2 = instantiate_test("foo"); // expected-note {{here}} 79
