| 1 | // RUN: %clang_cc1 -std=c++2a -verify %s |
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| 2 | |
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| 3 | struct A {}; |
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| 4 | constexpr int operator<=>(A a, A b) { return 42; } |
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| 5 | static_assert(operator<=>(A(), A()) == 42); |
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| 6 | |
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| 7 | int operator<=>(); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}} |
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| 8 | int operator<=>(A); // expected-error {{overloaded 'operator<=>' must be a binary operator}} |
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| 9 | int operator<=>(int, int); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}} |
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| 10 | int operator<=>(A, A, A); // expected-error {{overloaded 'operator<=>' must be a binary operator}} |
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| 11 | int operator<=>(A, A, ...); // expected-error {{overloaded 'operator<=>' cannot be variadic}} |
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| 12 | int operator<=>(int, A = {}); // expected-error {{parameter of overloaded 'operator<=>' cannot have a default argument}} |
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| 13 | |
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| 14 | struct B { |
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| 15 | int &operator<=>(int); |
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| 16 | friend int operator<=>(A, B); |
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| 17 | |
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| 18 | friend int operator<=>(int, int); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}} |
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| 19 | void operator<=>(); // expected-error {{overloaded 'operator<=>' must be a binary operator}}; |
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| 20 | void operator<=>(A, ...); // expected-error {{overloaded 'operator<=>' cannot be variadic}} |
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| 21 | void operator<=>(A, A); // expected-error {{overloaded 'operator<=>' must be a binary operator}}; |
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| 22 | }; |
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| 23 | |
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| 24 | int &r = B().operator<=>(0); |
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| 25 | |
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