| // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s |
| |
| // A constexpr specifier used in an object declaration declares the object as |
| // const. |
| constexpr int a = 0; |
| extern const int a; |
| |
| int i; // expected-note 2{{here}} |
| constexpr int *b = &i; |
| extern int *const b; |
| |
| constexpr int &c = i; |
| extern int &c; |
| |
| constexpr int (*d)(int) = 0; |
| extern int (*const d)(int); |
| |
| // A variable declaration which uses the constexpr specifier shall have an |
| // initializer and shall be initialized by a constant expression. |
| constexpr int ni1; // expected-error {{default initialization of an object of const type 'const int'}} |
| constexpr struct C { C(); } ni2; // expected-error {{cannot have non-literal type 'const struct C'}} expected-note 3{{has no constexpr constructors}} |
| constexpr double &ni3; // expected-error {{declaration of reference variable 'ni3' requires an initializer}} |
| |
| 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}} |
| constexpr C nc2 = C(); // expected-error {{cannot have non-literal type 'const C'}} |
| int &f(); // expected-note {{declared here}} |
| 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}} |
| 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}} |
| constexpr C nc5((C())); // expected-error {{cannot have non-literal type 'const C'}} |
| int &f(); // expected-note {{here}} |
| constexpr int &nc6(f()); // expected-error {{constexpr variable 'nc6' must be initialized by a constant expression}} expected-note {{non-constexpr function 'f'}} |
| |
| struct pixel { |
| int x, y; |
| }; |
| constexpr pixel ur = { 1294, 1024 }; // ok |
| constexpr pixel origin; // expected-error {{default initialization of an object of const type 'const pixel' without a user-provided default constructor}} |
