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