61 lines
2.5 KiB
C++
61 lines
2.5 KiB
C++
// RUN: %clang_cc1 -std=c++2a -verify %s -Wzero-as-null-pointer-constant
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// Keep this test before any declarations of operator<=>.
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namespace PR44786 {
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template<typename T> void f(decltype(T{} <=> T{})) {} // expected-note {{previous}}
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struct S {};
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int operator<=>(S const &, S const &);
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template<typename T> void f(decltype(T{} <=> T{})) {} // expected-error {{redefinition}}
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}
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struct A {};
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constexpr int operator<=>(A a, A b) { return 42; }
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static_assert(operator<=>(A(), A()) == 42);
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int operator<=>(); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}}
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int operator<=>(A); // expected-error {{overloaded 'operator<=>' must be a binary operator}}
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int operator<=>(int, int); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}}
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int operator<=>(A, A, A); // expected-error {{overloaded 'operator<=>' must be a binary operator}}
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int operator<=>(A, A, ...); // expected-error {{overloaded 'operator<=>' cannot be variadic}}
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int operator<=>(int, A = {}); // expected-error {{parameter of overloaded 'operator<=>' cannot have a default argument}}
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struct B {
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int &operator<=>(int);
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friend int operator<=>(A, B);
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friend int operator<=>(int, int); // expected-error {{overloaded 'operator<=>' must have at least one parameter of class or enumeration type}}
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void operator<=>(); // expected-error {{overloaded 'operator<=>' must be a binary operator}};
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void operator<=>(A, ...); // expected-error {{overloaded 'operator<=>' cannot be variadic}}
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void operator<=>(A, A); // expected-error {{overloaded 'operator<=>' must be a binary operator}};
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};
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int &r = B().operator<=>(0);
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namespace PR47893 {
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struct A {
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void operator<=>(const A&) const;
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};
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template<typename T> auto f(T a, T b) -> decltype(a < b) = delete;
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int &f(...);
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int &r = f(A(), A());
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}
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namespace PR44325 {
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struct cmp_cat {};
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bool operator<(cmp_cat, void*);
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bool operator>(cmp_cat, int cmp_cat::*);
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struct X {};
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cmp_cat operator<=>(X, X);
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bool b1 = X() < X(); // no warning
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bool b2 = X() > X(); // no warning
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// FIXME: It's not clear whether warning here is useful, but we can't really
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// tell that this is a comparison category in general. This is probably OK,
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// as comparisons against zero are only really intended for use in the
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// implicit rewrite rules, not for explicit use by programs.
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bool c = cmp_cat() < 0; // expected-warning {{zero as null pointer constant}}
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}
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