82 lines · cpp
1// RUN: %clang_cc1 -std=c++1y %s -verify2 3const char *has_no_member = [x("hello")] {}.x; // expected-error {{no member named 'x'}}4 5double f;6auto with_float = [f(1.0f)] {7 using T = decltype(f);8 using T = float;9};10auto with_float_2 = [&f(f)] { // ok, refers to outer f11 using T = decltype(f);12 using T = double&;13};14 15// Within the lambda-expression the identifier in the init-capture16// hides any declaration of the same name in scopes enclosing17// the lambda-expression.18void hiding() {19 char c;20 (void) [c("foo")] {21 static_assert(sizeof(c) == sizeof(const char*), "");22 };23 (void)[c("bar")]()->decltype(c) { // inner c24 return "baz";25 };26}27 28struct ExplicitCopy {29 ExplicitCopy(); // expected-note 2{{not viable}}30 explicit ExplicitCopy(const ExplicitCopy&); // expected-note 2{{not a candidate}}31};32auto init_kind_1 = [ec(ExplicitCopy())] {};33auto init_kind_2 = [ec = ExplicitCopy()] {}; // expected-error {{no matching constructor}}34 35template<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}39template void init_kind_template<int>();40template void init_kind_template<ExplicitCopy>(); // expected-note {{instantiation of}}41 42void void_fn();43int overload_fn();44int overload_fn(int);45 46auto bad_init_1 = [a()] {}; // expected-error {{expected expression}}47auto bad_init_2 = [a(1, 2)] {}; // expected-error {{initializer for lambda capture 'a' contains multiple expressions}}48auto bad_init_3 = [&a(void_fn())] {}; // expected-error {{cannot form a reference to 'void'}}49auto bad_init_4 = [a(void_fn())] {}; // expected-error {{has incomplete type 'void'}}50auto bad_init_5 = [a(overload_fn)] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer of type '<overloaded function}}51auto bad_init_6 = [a{overload_fn}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from initializer list}}52auto bad_init_7 = [a{{1}}] {}; // expected-error {{cannot deduce type for lambda capture 'a' from nested initializer list}}53 54template<typename...T> void pack_1(T...t) { (void)[a(t...)] {}; } // expected-error {{initializer missing for lambda capture 'a'}}55template void pack_1<>(); // expected-note {{instantiation of}}56 57// No lifetime-extension of the temporary here.58auto a_copy = [&c = static_cast<const int&&>(0)] {}; // expected-warning {{temporary whose address is used as value of local variable 'a_copy' will be destroyed at the end of the full-expression}} expected-note {{via initialization of lambda capture 'c'}}59 60// But there is lifetime extension here.61auto &&a = [a(4), b = 5, &c = static_cast<const int&&>(0)] {62 static_assert(sizeof(a) == sizeof(int), "");63 static_assert(sizeof(b) == sizeof(int), "");64 using T = decltype(c);65 using T = const int &;66};67auto b = [a{0}] {}; // OK, per N392268 69struct S { S(); S(S&&); };70template<typename T> struct remove_reference { typedef T type; };71template<typename T> struct remove_reference<T&> { typedef T type; };72template<typename T> decltype(auto) move(T &&t) { return static_cast<typename remove_reference<T>::type&&>(t); }73auto s = [s(move(S()))] {};74 75template<typename T> T instantiate_test(T t) {76 [x(&t)]() { *x = 1; } (); // expected-error {{assigning to 'const char *'}}77 // expected-note@-1 {{while substituting into a lambda expression here}}78 return t;79}80int instantiate_test_1 = instantiate_test(0);81const char *instantiate_test_2 = instantiate_test("foo"); // expected-note {{here}}82