| // RUN: %clang_cc1 -verify -std=c++1y %s |
| |
| namespace std { |
| template<typename T> struct initializer_list { |
| const T *p; |
| unsigned long n; |
| initializer_list(const T *p, unsigned long n); |
| }; |
| } |
| |
| int i; |
| int &&f(); |
| |
| template <typename T> |
| void overloaded_fn(T); // expected-note {{possible target}} |
| |
| using Int = int; |
| using IntLRef = int&; |
| using IntRRef = int&&; |
| using InitListInt = std::initializer_list<int>; |
| using IntPtr = int*; |
| |
| auto x3a = i; |
| decltype(auto) x3d = i; |
| using Int = decltype(x3a); |
| using Int = decltype(x3d); |
| |
| auto x4a = (i); |
| decltype(auto) x4d = (i); |
| using Int = decltype(x4a); |
| using IntLRef = decltype(x4d); |
| |
| auto x5a = f(); |
| decltype(auto) x5d = f(); |
| using Int = decltype(x5a); |
| using IntRRef = decltype(x5d); |
| |
| auto x6a = { 1, 2 }; |
| decltype(auto) x6d = { 1, 2 }; // expected-error {{cannot deduce 'decltype(auto)' from initializer list}} |
| using InitListInt = decltype(x6a); |
| |
| auto *x7a = &i; |
| decltype(auto) *x7d = &i; // expected-error {{cannot form pointer to 'decltype(auto)'}} |
| using IntPtr = decltype(x7a); |
| |
| struct S {}; |
| |
| decltype(auto) f1(); |
| decltype(auto) (*f2)(); // expected-error {{'decltype(auto)' can only be used as a return type in a function declaration}} expected-error {{requires an initializer}} |
| decltype(auto) *f3(); // expected-error {{cannot form pointer to 'decltype(auto)'}} |
| const decltype(auto) f4(); // expected-error {{'decltype(auto)' cannot be combined with other type specifiers}} |
| typedef decltype(auto) f5(); // expected-error {{'decltype(auto)' not allowed in typedef}} |
| decltype(auto) ((((((f6))))())); // ok |
| decltype(auto) f7()(); // expected-error {{'decltype(auto)' can only be used as a return type in a function declaration}} |
| decltype(auto) (S::*f8)(); // expected-error {{'decltype(auto)' can only be used as a return type in a function declaration}} expected-error {{requires an initializer}} |
| decltype(auto) &f9(); // expected-error {{cannot form reference to 'decltype(auto)'}} |
| decltype(auto) (&f10())[10]; // expected-error {{cannot form array of 'decltype(auto)'}} |
| |
| decltype(auto) ((((((v1)))))) = 0; // ok |
| decltype(auto) v2[1] = { 0 }; // expected-error {{cannot form array of 'decltype(auto)'}} |
| decltype(auto) &v3 = { 0 }; // expected-error {{cannot form reference to 'decltype(auto)'}} |
| decltype(auto) *v4 = { 0 }; // expected-error {{cannot form pointer to 'decltype(auto)'}} |
| decltype(auto) v5 = &overloaded_fn; // expected-error {{could not be resolved}} |
| |
| auto multi1a = 0, &multi1b = multi1a; |
| auto multi1c = multi1a, multi1d = multi1b; |
| decltype(auto) multi1e = multi1a, multi1f = multi1b; // expected-error {{'decltype(auto)' deduced as 'int' in declaration of 'multi1e' and deduced as 'int &' in declaration of 'multi1f'}} |
| |
| auto f1a() { return 0; } |
| decltype(auto) f1d() { return 0; } |
| using Int = decltype(f1a()); |
| using Int = decltype(f1d()); |
| |
| auto f2a(int n) { return n; } |
| decltype(auto) f2d(int n) { return n; } |
| using Int = decltype(f2a(0)); |
| using Int = decltype(f2d(0)); |
| |
| auto f3a(int n) { return (n); } |
| decltype(auto) f3d(int n) { return (n); } // expected-warning {{reference to stack memory}} |
| using Int = decltype(f3a(0)); |
| using IntLRef = decltype(f3d(0)); |
| |
| auto f4a(int n) { return f(); } |
| decltype(auto) f4d(int n) { return f(); } |
| using Int = decltype(f4a(0)); |
| using IntRRef = decltype(f4d(0)); |
| |
| auto f5aa(int n) { auto x = f(); return x; } |
| auto f5ad(int n) { decltype(auto) x = f(); return x; } |
| decltype(auto) f5da(int n) { auto x = f(); return x; } |
| decltype(auto) f5dd(int n) { decltype(auto) x = f(); return x; } // expected-error {{rvalue reference to type 'int' cannot bind to lvalue}} |
| using Int = decltype(f5aa(0)); |
| using Int = decltype(f5ad(0)); |
| using Int = decltype(f5da(0)); |
| |
| auto init_list_1() { return { 1, 2, 3 }; } // expected-error {{cannot deduce return type from initializer list}} |
| decltype(auto) init_list_2() { return { 1, 2, 3 }; } // expected-error {{cannot deduce return type from initializer list}} |