p3-1y.cpp revision a2c3646c35dd09d21b74826240aa916545b1873f
1a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++1y 2a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith// RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++11 -Wno-c++1y-extensions 3a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 4a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith// FIXME: This is in p11 (?) in C++1y. 5a2c3646c35dd09d21b74826240aa916545b1873fRichard Smithvoid f() { 6a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith decltype(auto) a = a; // expected-error{{variable 'a' declared with 'auto' type cannot appear in its own initializer}} 7a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith if (decltype(auto) b = b) {} // expected-error {{variable 'b' declared with 'auto' type cannot appear in its own initializer}} 8a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith decltype(auto) c = ({ decltype(auto) d = c; 0; }); // expected-error {{variable 'c' declared with 'auto' type cannot appear in its own initializer}} 9a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith} 10a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 11a2c3646c35dd09d21b74826240aa916545b1873fRichard Smithvoid g() { 12a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith decltype(auto) a; // expected-error{{declaration of variable 'a' with type 'decltype(auto)' requires an initializer}} 13a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 14a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith decltype(auto) *b; // expected-error{{cannot form pointer to 'decltype(auto)'}} expected-error{{declaration of variable 'b' with type 'decltype(auto) *' requires an initializer}} 15a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 16a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith if (decltype(auto) b) {} // expected-error {{must have an initializer}} 17a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith for (;decltype(auto) b;) {} // expected-error {{must have an initializer}} 18a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith while (decltype(auto) b) {} // expected-error {{must have an initializer}} 19a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith if (decltype(auto) b = true) { (void)b; } 20a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith} 21a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 22a2c3646c35dd09d21b74826240aa916545b1873fRichard Smithdecltype(auto) n(1,2,3); // expected-error{{initializer for variable 'n' with type 'decltype(auto)' contains multiple expressions}} 23a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 24a2c3646c35dd09d21b74826240aa916545b1873fRichard Smithnamespace N 25a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith{ 26a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith // All of these are references, because a string literal is an lvalue. 27a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith decltype(auto) a = "const char (&)[19]", b = a, c = (a); 28a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith} 29a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 30a2c3646c35dd09d21b74826240aa916545b1873fRichard Smithvoid h() { 31a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith decltype(auto) b = 42ULL; 32a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 33a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith for (decltype(auto) c = 0; c < b; ++c) { 34a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith } 35a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith} 36a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 37a2c3646c35dd09d21b74826240aa916545b1873fRichard Smithtemplate<typename T, typename U> struct same; 38a2c3646c35dd09d21b74826240aa916545b1873fRichard Smithtemplate<typename T> struct same<T, T> {}; 39a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith 40a2c3646c35dd09d21b74826240aa916545b1873fRichard Smithvoid i() { 41a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith decltype(auto) x = 5; 42a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith decltype(auto) int r; // expected-error {{cannot combine with previous 'decltype(auto)' declaration specifier}} expected-error {{requires an initializer}} 43a2c3646c35dd09d21b74826240aa916545b1873fRichard Smith} 44