1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s 2 3 // A constexpr specifier used in an object declaration declares the object as 4 // const. 5 constexpr int a = 0; 6 extern const int a; 7 8 int i; // expected-note 2{{here}} 9 constexpr int *b = &i; 10 extern int *const b; 11 12 constexpr int &c = i; 13 extern int &c; 14 15 constexpr int (*d)(int) = 0; 16 extern int (*const d)(int); 17 18 // A variable declaration which uses the constexpr specifier shall have an 19 // initializer and shall be initialized by a constant expression. 20 constexpr int ni1; // expected-error {{default initialization of an object of const type 'const int'}} 21 constexpr struct C { C(); } ni2; // expected-error {{cannot have non-literal type 'const struct C'}} expected-note 3{{has no constexpr constructors}} 22 constexpr double &ni3; // expected-error {{declaration of reference variable 'ni3' requires an initializer}} 23 24 constexpr int nc1 = i; // expected-error {{constexpr variable 'nc1' must be initialized by a constant expression}} expected-note {{read of non-const variable 'i' is not allowed in a constant expression}} 25 constexpr C nc2 = C(); // expected-error {{cannot have non-literal type 'const C'}} 26 int &f(); // expected-note {{declared here}} 27 constexpr int &nc3 = f(); // expected-error {{constexpr variable 'nc3' must be initialized by a constant expression}} expected-note {{non-constexpr function 'f' cannot be used in a constant expression}} 28 constexpr int nc4(i); // expected-error {{constexpr variable 'nc4' must be initialized by a constant expression}} expected-note {{read of non-const variable 'i' is not allowed in a constant expression}} 29 constexpr C nc5((C())); // expected-error {{cannot have non-literal type 'const C'}} 30 int &f(); // expected-note {{here}} 31 constexpr int &nc6(f()); // expected-error {{constexpr variable 'nc6' must be initialized by a constant expression}} expected-note {{non-constexpr function 'f'}} 32 33 struct pixel { 34 int x, y; 35 }; 36 constexpr pixel ur = { 1294, 1024 }; // ok 37 constexpr pixel origin; // expected-error {{default initialization of an object of const type 'const pixel' without a user-provided default constructor}} 38
