| // RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -emit-llvm-only %s |
| // RUN: %clang_cc1 -std=c++2a -verify -fsyntax-only -fblocks -emit-llvm-only %s |
| // DONTRUNYET: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -fdelayed-template-parsing %s -DDELAYED_TEMPLATE_PARSING |
| // DONTRUNYET: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -fms-extensions %s -DMS_EXTENSIONS |
| // DONTRUNYET: %clang_cc1 -std=c++1y -verify -fsyntax-only -fblocks -fdelayed-template-parsing -fms-extensions %s -DMS_EXTENSIONS -DDELAYED_TEMPLATE_PARSING |
| |
| constexpr int ODRUSE_SZ = sizeof(char); |
| |
| template<class T, int N> |
| void f(T, const int (&)[N]) { } |
| |
| template<class T> |
| void f(const T&, const int (&)[ODRUSE_SZ]) { } |
| |
| #define DEFINE_SELECTOR(x) \ |
| int selector_ ## x[sizeof(x) == ODRUSE_SZ ? ODRUSE_SZ : ODRUSE_SZ + 5] |
| |
| #define F_CALL(x, a) f(x, selector_ ## a) |
| |
| // This is a risky assumption, because if an empty class gets captured by value |
| // the lambda's size will still be '1' |
| #define ASSERT_NO_CAPTURES(L) static_assert(sizeof(L) == 1, "size of closure with no captures must be 1") |
| #define ASSERT_CLOSURE_SIZE_EXACT(L, N) static_assert(sizeof(L) == (N), "size of closure must be " #N) |
| #define ASSERT_CLOSURE_SIZE(L, N) static_assert(sizeof(L) >= (N), "size of closure must be >=" #N) |
| |
| |
| namespace sample { |
| struct X { |
| int i; |
| X(int i) : i(i) { } |
| }; |
| } |
| |
| namespace test_transformations_in_templates { |
| template<class T> void foo(T t) { |
| auto L = [](auto a) { return a; }; |
| } |
| template<class T> void foo2(T t) { |
| auto L = [](auto a) -> void { |
| auto M = [](char b) -> void { |
| auto N = [](auto c) -> void { |
| int selector[sizeof(c) == 1 ? |
| (sizeof(b) == 1 ? 1 : 2) |
| : 2 |
| ]{}; |
| }; |
| N('a'); |
| }; |
| }; |
| L(3.14); |
| } |
| |
| void doit() { |
| foo(3); |
| foo('a'); |
| foo2('A'); |
| } |
| } |
| |
| namespace test_return_type_deduction { |
| |
| void doit() { |
| |
| auto L = [](auto a, auto b) { |
| if ( a > b ) return a; |
| return b; |
| }; |
| L(2, 4); |
| { |
| auto L2 = [](auto a, int i) { |
| return a + i; |
| }; |
| L2(3.14, 2); |
| } |
| { |
| int a; //expected-note{{declared here}} |
| auto B = []() { return ^{ return a; }; }; //expected-error{{cannot be implicitly capture}}\ |
| //expected-note{{begins here}} |
| //[](){ return ({int b = 5; return 'c'; 'x';}); }; |
| |
| //auto X = ^{ return a; }; |
| |
| //auto Y = []() -> auto { return 3; return 'c'; }; |
| |
| } |
| } |
| } |
| |
| |
| namespace test_no_capture{ |
| void doit() { |
| const int x = 10; //expected-note{{declared here}} |
| { |
| // should not capture 'x' - variable undergoes lvalue-to-rvalue |
| auto L = [=](auto a) { |
| int y = x; |
| return a + y; |
| }; |
| ASSERT_NO_CAPTURES(L); |
| } |
| { |
| // should not capture 'x' - even though certain instantiations require |
| auto L = [](auto a) { //expected-note{{begins here}} |
| DEFINE_SELECTOR(a); |
| F_CALL(x, a); //expected-error{{'x' cannot be implicitly captured}} |
| }; |
| ASSERT_NO_CAPTURES(L); |
| L('s'); //expected-note{{in instantiation of}} |
| } |
| { |
| // Does not capture because no default capture in inner most lambda 'b' |
| auto L = [=](auto a) { |
| return [=](int p) { |
| return [](auto b) { |
| DEFINE_SELECTOR(a); |
| F_CALL(x, a); |
| return 0; |
| }; |
| }; |
| }; |
| ASSERT_NO_CAPTURES(L); |
| } |
| } // doit |
| } // namespace |
| |
| namespace test_capture_of_potentially_evaluated_expression { |
| void doit() { |
| const int x = 5; |
| { |
| auto L = [=](auto a) { |
| DEFINE_SELECTOR(a); |
| F_CALL(x, a); |
| }; |
| static_assert(sizeof(L) == 4, "Must be captured"); |
| } |
| { |
| int j = 0; //expected-note{{declared}} |
| auto L = [](auto a) { //expected-note{{begins here}} |
| return j + 1; //expected-error{{cannot be implicitly captured}} |
| }; |
| } |
| { |
| const int x = 10; |
| auto L = [](auto a) { |
| //const int y = 20; |
| return [](int p) { |
| return [](auto b) { |
| DEFINE_SELECTOR(a); |
| F_CALL(x, a); |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(3); |
| auto N = M(5); |
| |
| } |
| |
| { // if the nested capture does not implicitly or explicitly allow any captures |
| // nothing should capture - and instantiations will create errors if needed. |
| const int x = 0; |
| auto L = [=](auto a) { // <-- #A |
| const int y = 0; |
| return [](auto b) { // <-- #B |
| int c[sizeof(b)]; |
| f(x, c); |
| f(y, c); |
| int i = x; |
| }; |
| }; |
| ASSERT_NO_CAPTURES(L); |
| auto M_int = L(2); |
| ASSERT_NO_CAPTURES(M_int); |
| } |
| { // Permutations of this example must be thoroughly tested! |
| const int x = 0; |
| sample::X cx{5}; |
| auto L = [=](auto a) { |
| const int z = 3; |
| // FIXME: The warning below is correct but for some reason doesn't show |
| // up in C++17 mode. |
| return [&,a](auto b) { |
| #if __cplusplus > 201702L |
| // expected-warning@-2 {{address of stack memory associated with local variable 'z' returned}} |
| // expected-note@#call {{in instantiation of}} |
| #endif |
| const int y = 5; |
| return [=](auto c) { |
| int d[sizeof(a) == sizeof(c) || sizeof(c) == sizeof(b) ? 2 : 1]; |
| f(x, d); |
| f(y, d); |
| f(z, d); |
| decltype(a) A = a; |
| decltype(b) B = b; |
| const int &i = cx.i; |
| }; |
| }; |
| }; |
| auto M = L(3)(3.5); // #call |
| M(3.14); |
| } |
| } |
| namespace Test_no_capture_of_clearly_no_odr_use { |
| auto foo() { |
| const int x = 10; |
| auto L = [=](auto a) { |
| return [=](auto b) { |
| return [=](auto c) { |
| int A = x; |
| return A; |
| }; |
| }; |
| }; |
| auto M = L(1); |
| auto N = M(2.14); |
| ASSERT_NO_CAPTURES(L); |
| ASSERT_NO_CAPTURES(N); |
| |
| return 0; |
| } |
| } |
| |
| namespace Test_capture_of_odr_use_var { |
| auto foo() { |
| const int x = 10; |
| auto L = [=](auto a) { |
| return [=](auto b) { |
| return [=](auto c) { |
| int A = x; |
| const int &i = x; |
| decltype(a) A2 = a; |
| return A; |
| }; |
| }; |
| }; |
| auto M_int = L(1); |
| auto N_int_int = M_int(2); |
| ASSERT_CLOSURE_SIZE_EXACT(L, sizeof(x)); |
| // M_int captures both a & x |
| ASSERT_CLOSURE_SIZE_EXACT(M_int, sizeof(x) + sizeof(int)); |
| // N_int_int captures both a & x |
| ASSERT_CLOSURE_SIZE_EXACT(N_int_int, sizeof(x) + sizeof(int)); |
| auto M_double = L(3.14); |
| ASSERT_CLOSURE_SIZE(M_double, sizeof(x) + sizeof(double)); |
| |
| return 0; |
| } |
| auto run = foo(); |
| } |
| |
| } |
| namespace more_nested_captures_1 { |
| template<class T> struct Y { |
| static void f(int, double, ...) { } |
| template<class R> |
| static void f(const int&, R, ...) { } |
| template<class R> |
| void foo(R t) { |
| const int x = 10; //expected-note{{declared here}} |
| auto L = [](auto a) { |
| return [=](auto b) { |
| return [=](auto c) { |
| f(x, c, b, a); //expected-error{{reference to local variable 'x'}} |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(t); |
| auto N = M('b'); |
| N(3.14); |
| N(5); //expected-note{{in instantiation of}} |
| } |
| }; |
| Y<int> yi; |
| int run = (yi.foo(3.14), 0); //expected-note{{in instantiation of}} |
| } |
| |
| |
| namespace more_nested_captures_1_1 { |
| template<class T> struct Y { |
| static void f(int, double, ...) { } |
| template<class R> |
| static void f(const int&, R, ...) { } |
| template<class R> |
| void foo(R t) { |
| const int x = 10; //expected-note{{declared here}} |
| auto L = [](auto a) { |
| return [=](char b) { |
| return [=](auto c) { |
| f(x, c, b, a); //expected-error{{reference to local variable 'x'}} |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(t); |
| auto N = M('b'); |
| N(3.14); |
| N(5); //expected-note{{in instantiation of}} |
| } |
| }; |
| Y<int> yi; |
| int run = (yi.foo(3.14), 0); //expected-note{{in instantiation of}} |
| } |
| namespace more_nested_captures_1_2 { |
| template<class T> struct Y { |
| static void f(int, double, ...) { } |
| template<class R> |
| static void f(const int&, R, ...) { } |
| template<class R> |
| void foo(R t) { |
| const int x = 10; |
| auto L = [=](auto a) { |
| return [=](char b) { |
| return [=](auto c) { |
| f(x, c, b, a); |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(t); |
| auto N = M('b'); |
| N(3.14); |
| N(5); |
| } |
| }; |
| Y<int> yi; |
| int run = (yi.foo(3.14), 0); |
| } |
| |
| namespace more_nested_captures_1_3 { |
| template<class T> struct Y { |
| static void f(int, double, ...) { } |
| template<class R> |
| static void f(const int&, R, ...) { } |
| template<class R> |
| void foo(R t) { |
| const int x = 10; //expected-note{{declared here}} |
| auto L = [=](auto a) { |
| return [](auto b) { |
| const int y = 0; |
| return [=](auto c) { |
| f(x, c, b); //expected-error{{reference to local variable 'x'}} |
| f(y, b, c); |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(t); |
| auto N = M('b'); |
| N(3.14); |
| N(5); //expected-note{{in instantiation of}} |
| } |
| }; |
| Y<int> yi; |
| int run = (yi.foo(3.14), 0); //expected-note{{in instantiation of}} |
| } |
| |
| |
| namespace more_nested_captures_1_4 { |
| template<class T> struct Y { |
| static void f(int, double, ...) { } |
| template<class R> |
| static void f(const int&, R, ...) { } |
| template<class R> |
| void foo(R t) { |
| const int x = 10; //expected-note{{declared here}} |
| auto L = [=](auto a) { |
| T t2{t}; |
| return [](auto b) { |
| const int y = 0; //expected-note{{declared here}} |
| return [](auto c) { //expected-note 2{{lambda expression begins here}} |
| f(x, c); //expected-error{{variable 'x'}} |
| f(y, c); //expected-error{{variable 'y'}} |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(t); |
| auto N_char = M('b'); |
| N_char(3.14); |
| auto N_double = M(3.14); |
| N_double(3.14); |
| N_char(3); //expected-note{{in instantiation of}} |
| } |
| }; |
| Y<int> yi; |
| int run = (yi.foo('a'), 0); //expected-note{{in instantiation of}} |
| } |
| |
| |
| namespace more_nested_captures_2 { |
| template<class T> struct Y { |
| static void f(int, double) { } |
| template<class R> |
| static void f(const int&, R) { } |
| template<class R> |
| void foo(R t) { |
| const int x = 10; |
| auto L = [=](auto a) { |
| return [=](auto b) { |
| return [=](auto c) { |
| f(x, c); |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(t); |
| auto N = M('b'); |
| N(3); |
| N(3.14); |
| } |
| }; |
| Y<int> yi; |
| int run = (yi.foo(3.14), 0); |
| |
| } |
| |
| namespace more_nested_captures_3 { |
| template<class T> struct Y { |
| static void f(int, double) { } |
| template<class R> |
| static void f(const int&, R) { } |
| template<class R> |
| void foo(R t) { |
| const int x = 10; //expected-note{{declared here}} |
| auto L = [](auto a) { |
| return [=](auto b) { |
| return [=](auto c) { |
| f(x, c); //expected-error{{reference to local variable 'x'}} |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(t); |
| auto N = M('b'); |
| N(3); //expected-note{{in instantiation of}} |
| N(3.14); |
| } |
| }; |
| Y<int> yi; |
| int run = (yi.foo(3.14), 0); //expected-note{{in instantiation of}} |
| |
| } |
| |
| namespace more_nested_captures_4 { |
| template<class T> struct Y { |
| static void f(int, double) { } |
| template<class R> |
| static void f(const int&, R) { } |
| template<class R> |
| void foo(R t) { |
| const int x = 10; //expected-note{{'x' declared here}} |
| auto L = [](auto a) { |
| return [=](char b) { |
| return [=](auto c) { |
| f(x, c); //expected-error{{reference to local variable 'x'}} |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(t); |
| auto N = M('b'); |
| N(3); //expected-note{{in instantiation of}} |
| N(3.14); |
| } |
| }; |
| Y<int> yi; |
| int run = (yi.foo(3.14), 0); //expected-note{{in instantiation of}} |
| |
| } |
| |
| namespace more_nested_captures_5 { |
| template<class T> struct Y { |
| static void f(int, double) { } |
| template<class R> |
| static void f(const int&, R) { } |
| template<class R> |
| void foo(R t) { |
| const int x = 10; |
| auto L = [=](auto a) { |
| return [=](char b) { |
| return [=](auto c) { |
| f(x, c); |
| return 0; |
| }; |
| }; |
| }; |
| auto M = L(t); |
| auto N = M('b'); |
| N(3); |
| N(3.14); |
| } |
| }; |
| Y<int> yi; |
| int run = (yi.foo(3.14), 0); |
| |
| } |
| |
| namespace lambdas_in_NSDMIs { |
| template<class T> |
| struct L { |
| T t{}; |
| T t2 = ([](auto a) { return [](auto b) { return b; };})(t)(t); |
| T t3 = ([](auto a) { return a; })(t); |
| }; |
| L<int> l; |
| int run = l.t2; |
| } |
| namespace test_nested_decltypes_in_trailing_return_types { |
| int foo() { |
| auto L = [](auto a) { |
| return [](auto b, decltype(a) b2) -> decltype(a) { |
| return decltype(a){}; |
| }; |
| }; |
| auto M = L(3.14); |
| M('a', 6.26); |
| return 0; |
| } |
| } |
| |
| namespace more_this_capture_1 { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| void foo() { |
| { |
| auto L = [=](auto a) { |
| f(a); |
| }; |
| L(3); |
| L(3.13); |
| } |
| { |
| auto L = [](auto a) { |
| f(a); //expected-error{{this}} |
| }; |
| L(3.13); |
| L(2); //expected-note{{in instantiation}} |
| } |
| } |
| |
| int g() { |
| auto L = [=](auto a) { |
| return [](int i) { |
| return [=](auto b) { |
| f(b); |
| int x = i; |
| }; |
| }; |
| }; |
| auto M = L(0.0); |
| auto N = M(3); |
| N(5.32); // OK |
| return 0; |
| } |
| }; |
| int run = X{}.g(); |
| } |
| namespace more_this_capture_1_1 { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| |
| int g() { |
| auto L = [=](auto a) { |
| return [](int i) { |
| return [=](auto b) { |
| f(decltype(a){}); //expected-error{{this}} |
| int x = i; |
| }; |
| }; |
| }; |
| auto M = L(0.0); |
| auto N = M(3); |
| N(5.32); // OK |
| L(3); // expected-note{{instantiation}} |
| return 0; |
| } |
| }; |
| int run = X{}.g(); |
| } |
| |
| namespace more_this_capture_1_1_1 { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| |
| int g() { |
| auto L = [=](auto a) { |
| return [](auto b) { |
| return [=](int i) { |
| f(b); |
| f(decltype(a){}); //expected-error{{this}} |
| }; |
| }; |
| }; |
| auto M = L(0.0); // OK |
| auto N = M(3.3); //OK |
| auto M_int = L(0); //expected-note{{instantiation}} |
| return 0; |
| } |
| }; |
| int run = X{}.g(); |
| } |
| |
| |
| namespace more_this_capture_1_1_1_1 { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| |
| int g() { |
| auto L = [=](auto a) { |
| return [](auto b) { |
| return [=](int i) { |
| f(b); //expected-error{{this}} |
| f(decltype(a){}); |
| }; |
| }; |
| }; |
| auto M_double = L(0.0); // OK |
| auto N = M_double(3); //expected-note{{instantiation}} |
| |
| return 0; |
| } |
| }; |
| int run = X{}.g(); |
| } |
| |
| namespace more_this_capture_2 { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| |
| int g() { |
| auto L = [=](auto a) { |
| return [](int i) { |
| return [=](auto b) { |
| f(b); //expected-error{{'this' cannot}} |
| int x = i; |
| }; |
| }; |
| }; |
| auto M = L(0.0); |
| auto N = M(3); |
| N(5); // NOT OK expected-note{{in instantiation of}} |
| return 0; |
| } |
| }; |
| int run = X{}.g(); |
| } |
| namespace diagnose_errors_early_in_generic_lambdas { |
| |
| int foo() |
| { |
| |
| { // This variable is used and must be caught early, do not need instantiation |
| const int x = 0; //expected-note{{declared}} |
| auto L = [](auto a) { //expected-note{{begins}} |
| const int &r = x; //expected-error{{variable}} |
| }; |
| } |
| { // This variable is not used |
| const int x = 0; |
| auto L = [](auto a) { |
| int i = x; |
| }; |
| } |
| { |
| |
| const int x = 0; //expected-note{{declared}} |
| auto L = [=](auto a) { // <-- #A |
| const int y = 0; |
| return [](auto b) { //expected-note{{begins}} |
| int c[sizeof(b)]; |
| f(x, c); |
| f(y, c); |
| int i = x; |
| // This use will always be an error regardless of instantatiation |
| // so diagnose this early. |
| const int &r = x; //expected-error{{variable}} |
| }; |
| }; |
| |
| } |
| return 0; |
| } |
| |
| int run = foo(); |
| } |
| |
| namespace generic_nongenerics_interleaved_1 { |
| int foo() { |
| { |
| auto L = [](int a) { |
| int y = 10; |
| return [=](auto b) { |
| return a + y; |
| }; |
| }; |
| auto M = L(3); |
| M(5); |
| } |
| { |
| int x; |
| auto L = [](int a) { |
| int y = 10; |
| return [=](auto b) { |
| return a + y; |
| }; |
| }; |
| auto M = L(3); |
| M(5); |
| } |
| { |
| // FIXME: why are there 2 error messages here? |
| int x; |
| auto L = [](auto a) { //expected-note {{declared here}} |
| int y = 10; //expected-note {{declared here}} |
| return [](int b) { //expected-note 2{{expression begins here}} |
| return [=] (auto c) { |
| return a + y; //expected-error 2{{cannot be implicitly captured}} |
| }; |
| }; |
| }; |
| } |
| { |
| int x; |
| auto L = [](auto a) { |
| int y = 10; |
| return [=](int b) { |
| return [=] (auto c) { |
| return a + y; |
| }; |
| }; |
| }; |
| } |
| return 1; |
| } |
| |
| int run = foo(); |
| } |
| namespace dont_capture_refs_if_initialized_with_constant_expressions { |
| |
| auto foo(int i) { |
| // This is surprisingly not odr-used within the lambda! |
| static int j; |
| j = i; |
| int &ref_j = j; |
| return [](auto a) { return ref_j; }; // ok |
| } |
| |
| template<class T> |
| auto foo2(T t) { |
| // This is surprisingly not odr-used within the lambda! |
| static T j; |
| j = t; |
| T &ref_j = j; |
| return [](auto a) { return ref_j; }; // ok |
| } |
| |
| int do_test() { |
| auto L = foo(3); |
| auto L_int = L(3); |
| auto L_char = L('a'); |
| auto L1 = foo2(3.14); |
| auto L1_int = L1(3); |
| auto L1_char = L1('a'); |
| return 0; |
| } |
| |
| } // dont_capture_refs_if_initialized_with_constant_expressions |
| |
| namespace test_conversion_to_fptr { |
| |
| template<class T> struct X { |
| |
| T (*fp)(T) = [](auto a) { return a; }; |
| |
| }; |
| |
| X<int> xi; |
| |
| template<class T> |
| void fooT(T t, T (*fp)(T) = [](auto a) { return a; }) { |
| fp(t); |
| } |
| |
| int test() { |
| { |
| auto L = [](auto a) { return a; }; |
| int (*fp)(int) = L; |
| fp(5); |
| L(3); |
| char (*fc)(char) = L; |
| fc('b'); |
| L('c'); |
| double (*fd)(double) = L; |
| fd(3.14); |
| fd(6.26); |
| L(4.25); |
| } |
| { |
| auto L = [](auto a) ->int { return a; }; //expected-note 2{{candidate template ignored}} |
| int (*fp)(int) = L; |
| char (*fc)(char) = L; //expected-error{{no viable conversion}} |
| double (*fd)(double) = L; //expected-error{{no viable conversion}} |
| } |
| { |
| int x = 5; |
| auto L = [=](auto b, char c = 'x') { |
| int i = x; |
| return [](auto a) ->decltype(a) { return a; }; |
| }; |
| int (*fp)(int) = L(8); |
| fp(5); |
| L(3); |
| char (*fc)(char) = L('a'); |
| fc('b'); |
| L('c'); |
| double (*fd)(double) = L(3.14); |
| fd(3.14); |
| fd(6.26); |
| |
| } |
| { |
| auto L = [=](auto b) { |
| return [](auto a) ->decltype(b)* { return (decltype(b)*)0; }; |
| }; |
| int* (*fp)(int) = L(8); |
| fp(5); |
| L(3); |
| char* (*fc)(char) = L('a'); |
| fc('b'); |
| L('c'); |
| double* (*fd)(double) = L(3.14); |
| fd(3.14); |
| fd(6.26); |
| } |
| { |
| auto L = [=](auto b) { |
| return [](auto a) ->decltype(b)* { return (decltype(b)*)0; }; //expected-note{{candidate template ignored}} |
| }; |
| char* (*fp)(int) = L('8'); |
| fp(5); |
| char* (*fc)(char) = L('a'); |
| fc('b'); |
| double* (*fi)(int) = L(3.14); |
| fi(5); |
| int* (*fi2)(int) = L(3.14); //expected-error{{no viable conversion}} |
| } |
| |
| { |
| auto L = [=](auto b) { |
| return [](auto a) { |
| return [=](auto c) { |
| return [](auto d) ->decltype(a + b + c + d) { return d; }; |
| }; |
| }; |
| }; |
| int (*fp)(int) = L('8')(3)(short{}); |
| double (*fs)(char) = L(3.14)(short{})('4'); |
| } |
| |
| fooT(3); |
| fooT('a'); |
| fooT(3.14); |
| fooT("abcdefg"); |
| return 0; |
| } |
| int run2 = test(); |
| |
| } |
| |
| |
| namespace this_capture { |
| void f(char, int) { } |
| template<class T> |
| void f(T, const int&) { } |
| |
| struct X { |
| int x = 0; |
| void foo() { |
| auto L = [=](auto a) { |
| return [=](auto b) { |
| //f(a, x++); |
| x++; |
| }; |
| }; |
| L('a')(5); |
| L('b')(4); |
| L(3.14)('3'); |
| |
| } |
| |
| }; |
| |
| int run = (X{}.foo(), 0); |
| |
| namespace this_capture_unresolvable { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| |
| int g() { |
| auto lam = [=](auto a) { f(a); }; // captures 'this' |
| lam(0); // ok. |
| lam(0.0); // ok. |
| return 0; |
| } |
| int g2() { |
| auto lam = [](auto a) { f(a); }; // expected-error{{'this'}} |
| lam(0); // expected-note{{in instantiation of}} |
| lam(0.0); // ok. |
| return 0; |
| } |
| double (*fd)(double) = [](auto a) { f(a); return a; }; |
| |
| }; |
| |
| int run = X{}.g(); |
| |
| } |
| |
| namespace check_nsdmi_and_this_capture_of_member_functions { |
| |
| struct FunctorDouble { |
| template<class T> FunctorDouble(T t) { t(2.14); }; |
| }; |
| struct FunctorInt { |
| template<class T> FunctorInt(T t) { t(2); }; //expected-note{{in instantiation of}} |
| }; |
| |
| template<class T> struct YUnresolvable { |
| void f(int) { } |
| static void f(double) { } |
| |
| T t = [](auto a) { f(a); return a; }; |
| T t2 = [=](auto b) { f(b); return b; }; |
| }; |
| |
| template<class T> struct YUnresolvable2 { |
| void f(int) { } |
| static void f(double) { } |
| |
| T t = [](auto a) { f(a); return a; }; //expected-error{{'this'}} \ |
| //expected-note{{in instantiation of}} |
| T t2 = [=](auto b) { f(b); return b; }; |
| }; |
| |
| |
| YUnresolvable<FunctorDouble> yud; |
| // This will cause an error since it call's with an int and calls a member function. |
| YUnresolvable2<FunctorInt> yui; |
| |
| |
| template<class T> struct YOnlyStatic { |
| static void f(double) { } |
| |
| T t = [](auto a) { f(a); return a; }; |
| }; |
| YOnlyStatic<FunctorDouble> yos; |
| template<class T> struct YOnlyNonStatic { |
| void f(int) { } |
| |
| T t = [](auto a) { f(a); return a; }; //expected-error{{'this'}} |
| }; |
| |
| |
| } |
| |
| |
| namespace check_nsdmi_and_this_capture_of_data_members { |
| |
| struct FunctorDouble { |
| template<class T> FunctorDouble(T t) { t(2.14); }; |
| }; |
| struct FunctorInt { |
| template<class T> FunctorInt(T t) { t(2); }; |
| }; |
| |
| template<class T> struct YThisCapture { |
| const int x = 10; |
| static double d; |
| T t = [](auto a) { return x; }; //expected-error{{'this'}} |
| T t2 = [](auto b) { return d; }; |
| T t3 = [this](auto a) { |
| return [=](auto b) { |
| return x; |
| }; |
| }; |
| T t4 = [=](auto a) { |
| return [=](auto b) { |
| return x; |
| }; |
| }; |
| T t5 = [](auto a) { |
| return [=](auto b) { |
| return x; //expected-error{{'this'}} |
| }; |
| }; |
| }; |
| |
| template<class T> double YThisCapture<T>::d = 3.14; |
| |
| |
| } |
| |
| |
| #ifdef DELAYED_TEMPLATE_PARSING |
| template<class T> void foo_no_error(T t) { |
| auto L = []() |
| { return t; }; |
| } |
| template<class T> void foo(T t) { //expected-note 2{{declared here}} |
| auto L = []() //expected-note 2{{begins here}} |
| { return t; }; //expected-error 2{{cannot be implicitly captured}} |
| } |
| template void foo(int); //expected-note{{in instantiation of}} |
| |
| #else |
| |
| template<class T> void foo(T t) { //expected-note{{declared here}} |
| auto L = []() //expected-note{{begins here}} |
| { return t; }; //expected-error{{cannot be implicitly captured}} |
| } |
| |
| #endif |
| } |
| |
| namespace no_this_capture_for_static { |
| |
| struct X { |
| static void f(double) { } |
| |
| int g() { |
| auto lam = [=](auto a) { f(a); }; |
| lam(0); // ok. |
| ASSERT_NO_CAPTURES(lam); |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(); |
| } |
| |
| namespace this_capture_for_non_static { |
| |
| struct X { |
| void f(double) { } |
| |
| int g() { |
| auto L = [=](auto a) { f(a); }; |
| L(0); |
| auto L2 = [](auto a) { f(a); }; //expected-error {{cannot be implicitly captured}} |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(); |
| } |
| |
| namespace this_captures_with_num_args_disambiguation { |
| |
| struct X { |
| void f(int) { } |
| static void f(double, int i) { } |
| int g() { |
| auto lam = [](auto a) { f(a, a); }; |
| lam(0); |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(); |
| } |
| namespace enclosing_function_is_template_this_capture { |
| // Only error if the instantiation tries to use the member function. |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| template<class T> |
| int g(T t) { |
| auto L = [](auto a) { f(a); }; //expected-error{{'this'}} |
| L(t); // expected-note{{in instantiation of}} |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(0.0); // OK. |
| int run2 = X{}.g(0); // expected-note{{in instantiation of}} |
| |
| |
| } |
| |
| namespace enclosing_function_is_template_this_capture_2 { |
| // This should error, even if not instantiated, since |
| // this would need to be captured. |
| struct X { |
| void f(int) { } |
| template<class T> |
| int g(T t) { |
| auto L = [](auto a) { f(a); }; //expected-error{{'this'}} |
| L(t); |
| return 0; |
| } |
| }; |
| |
| } |
| |
| |
| namespace enclosing_function_is_template_this_capture_3 { |
| // This should not error, this does not need to be captured. |
| struct X { |
| static void f(int) { } |
| template<class T> |
| int g(T t) { |
| auto L = [](auto a) { f(a); }; |
| L(t); |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(0.0); // OK. |
| int run2 = X{}.g(0); // OK. |
| |
| } |
| |
| namespace nested_this_capture_1 { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| |
| int g() { |
| auto L = [=](auto a) { |
| return [this]() { |
| return [=](auto b) { |
| f(b); |
| }; |
| }; |
| }; |
| auto M = L(0); |
| auto N = M(); |
| N(5); |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(); |
| |
| } |
| |
| |
| namespace nested_this_capture_2 { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| |
| int g() { |
| auto L = [=](auto a) { |
| return [&]() { |
| return [=](auto b) { |
| f(b); |
| }; |
| }; |
| }; |
| auto M = L(0); |
| auto N = M(); |
| N(5); |
| N(3.14); |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(); |
| |
| } |
| |
| namespace nested_this_capture_3_1 { |
| struct X { |
| template<class T> |
| void f(int, T t) { } |
| template<class T> |
| static void f(double, T t) { } |
| |
| int g() { |
| auto L = [=](auto a) { |
| return [&](auto c) { |
| return [=](auto b) { |
| f(b, c); |
| }; |
| }; |
| }; |
| auto M = L(0); |
| auto N = M('a'); |
| N(5); |
| N(3.14); |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(); |
| |
| } |
| |
| |
| namespace nested_this_capture_3_2 { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| |
| int g() { |
| auto L = [=](auto a) { |
| return [](int i) { |
| return [=](auto b) { |
| f(b); //expected-error {{'this' cannot}} |
| int x = i; |
| }; |
| }; |
| }; |
| auto M = L(0.0); |
| auto N = M(3); |
| N(5); //expected-note {{in instantiation of}} |
| N(3.14); // OK. |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(); |
| |
| } |
| |
| namespace nested_this_capture_4 { |
| struct X { |
| void f(int) { } |
| static void f(double) { } |
| |
| int g() { |
| auto L = [](auto a) { |
| return [=](auto i) { |
| return [=](auto b) { |
| f(b); //expected-error {{'this' cannot}} |
| int x = i; |
| }; |
| }; |
| }; |
| auto M = L(0.0); |
| auto N = M(3); |
| N(5); //expected-note {{in instantiation of}} |
| N(3.14); // OK. |
| return 0; |
| } |
| }; |
| |
| int run = X{}.g(); |
| |
| } |
| namespace capture_enclosing_function_parameters { |
| |
| |
| inline auto foo(int x) { |
| int i = 10; |
| auto lambda = [=](auto z) { return x + z; }; |
| return lambda; |
| } |
| |
| int foo2() { |
| auto L = foo(3); |
| L(4); |
| L('a'); |
| L(3.14); |
| return 0; |
| } |
| |
| inline auto foo3(int x) { |
| int local = 1; |
| auto L = [=](auto a) { |
| int i = a[local]; |
| return [=](auto b) mutable { |
| auto n = b; |
| return [&, n](auto c) mutable { |
| ++local; |
| return ++x; |
| }; |
| }; |
| }; |
| auto M = L("foo-abc"); |
| auto N = M("foo-def"); |
| auto O = N("foo-ghi"); |
| |
| return L; |
| } |
| |
| int main() { |
| auto L3 = foo3(3); |
| auto M3 = L3("L3-1"); |
| auto N3 = M3("M3-1"); |
| auto O3 = N3("N3-1"); |
| N3("N3-2"); |
| M3("M3-2"); |
| M3("M3-3"); |
| L3("L3-2"); |
| } |
| } // end ns |
| |
| namespace capture_arrays { |
| |
| inline int sum_array(int n) { |
| int array2[5] = { 1, 2, 3, 4, 5}; |
| |
| auto L = [=](auto N) -> int { |
| int sum = 0; |
| int array[5] = { 1, 2, 3, 4, 5 }; |
| sum += array2[sum]; |
| sum += array2[N]; |
| return 0; |
| }; |
| L(2); |
| return L(n); |
| } |
| } |
| |
| namespace capture_non_odr_used_variable_because_named_in_instantiation_dependent_expressions { |
| |
| // even though 'x' is not odr-used, it should be captured. |
| |
| int test() { |
| const int x = 10; |
| auto L = [=](auto a) { |
| (void) +x + a; |
| }; |
| ASSERT_CLOSURE_SIZE_EXACT(L, sizeof(x)); |
| } |
| |
| } //end ns |
| #ifdef MS_EXTENSIONS |
| namespace explicit_spec { |
| template<class R> struct X { |
| template<class T> int foo(T t) { |
| auto L = [](auto a) { return a; }; |
| L(&t); |
| return 0; |
| } |
| |
| template<> int foo<char>(char c) { //expected-warning{{explicit specialization}} |
| const int x = 10; |
| auto LC = [](auto a) { return a; }; |
| R r; |
| LC(&r); |
| auto L = [=](auto a) { |
| return [=](auto b) { |
| int d[sizeof(a)]; |
| f(x, d); |
| }; |
| }; |
| auto M = L(1); |
| |
| ASSERT_NO_CAPTURES(M); |
| return 0; |
| } |
| |
| }; |
| |
| int run_char = X<int>{}.foo('a'); |
| int run_int = X<double>{}.foo(4); |
| } |
| #endif // MS_EXTENSIONS |
| |
| namespace nsdmi_capturing_this { |
| struct X { |
| int m = 10; |
| int n = [this](auto) { return m; }(20); |
| }; |
| |
| template<class T> |
| struct XT { |
| T m = 10; |
| T n = [this](auto) { return m; }(20); |
| }; |
| |
| XT<int> xt{}; |
| |
| |
| } |
| |
| void PR33318(int i) { |
| [&](auto) { static_assert(&i != nullptr, ""); }(0); // expected-warning 2{{always true}} expected-note {{instantiation}} |
| } |
| |
| // Check to make sure that we don't capture when member-calls are made to members that are not of 'this' class. |
| namespace PR34266 { |
| // https://bugs.llvm.org/show_bug.cgi?id=34266 |
| namespace ns1 { |
| struct A { |
| static void bar(int) { } |
| static void bar(double) { } |
| }; |
| |
| struct B |
| { |
| template<class T> |
| auto f() { |
| auto L = [=] { |
| T{}.bar(3.0); |
| T::bar(3); |
| |
| }; |
| ASSERT_NO_CAPTURES(L); |
| return L; |
| }; |
| }; |
| |
| void test() { |
| B{}.f<A>(); |
| } |
| } // end ns1 |
| |
| namespace ns2 { |
| struct A { |
| static void bar(int) { } |
| static void bar(double) { } |
| }; |
| |
| struct B |
| { |
| using T = A; |
| auto f() { |
| auto L = [=](auto a) { |
| T{}.bar(a); |
| T::bar(a); |
| |
| }; |
| ASSERT_NO_CAPTURES(L); |
| return L; |
| }; |
| }; |
| |
| void test() { |
| B{}.f()(3.0); |
| B{}.f()(3); |
| } |
| } // end ns2 |
| |
| namespace ns3 { |
| struct A { |
| void bar(int) { } |
| static void bar(double) { } |
| }; |
| |
| struct B |
| { |
| using T = A; |
| auto f() { |
| auto L = [=](auto a) { |
| T{}.bar(a); |
| T::bar(a); // This call ignores the instance member function because the implicit object argument fails to convert. |
| |
| }; |
| ASSERT_NO_CAPTURES(L); |
| return L; |
| }; |
| }; |
| |
| void test() { |
| B{}.f()(3.0); |
| B{}.f()(3); |
| } |
| |
| } // end ns3 |
| |
| |
| namespace ns4 { |
| struct A { |
| void bar(int) { } |
| static void bar(double) { } |
| }; |
| |
| struct B : A |
| { |
| using T = A; |
| auto f() { |
| auto L = [=](auto a) { |
| T{}.bar(a); |
| T::bar(a); |
| |
| }; |
| // just check to see if the size if >= 2 bytes (which should be the case if we capture anything) |
| ASSERT_CLOSURE_SIZE(L, 2); |
| return L; |
| }; |
| }; |
| |
| void test() { |
| B{}.f()(3.0); |
| B{}.f()(3); |
| } |
| |
| } // end ns4 |
| |
| namespace ns5 { |
| struct A { |
| void bar(int) { } |
| static void bar(double) { } |
| }; |
| |
| struct B |
| { |
| template<class T> |
| auto f() { |
| auto L = [&](auto a) { |
| T{}.bar(a); |
| T::bar(a); |
| |
| }; |
| |
| ASSERT_NO_CAPTURES(L); |
| return L; |
| }; |
| }; |
| |
| void test() { |
| B{}.f<A>()(3.0); |
| B{}.f<A>()(3); |
| } |
| |
| } // end ns5 |
| |
| } // end PR34266 |
| |
| namespace capture_pack { |
| #if __cplusplus >= 201702L |
| constexpr |
| #endif |
| auto v = |
| [](auto ...a) { |
| [&](auto ...b) { |
| ((a = b), ...); // expected-warning 0-1{{extension}} |
| }(100, 20, 3); |
| return (a + ...); // expected-warning 0-1{{extension}} |
| }(400, 50, 6); |
| #if __cplusplus >= 201702L |
| static_assert(v == 123); |
| #endif |
| } |