85 lines
4.1 KiB
C++
85 lines
4.1 KiB
C++
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// RUN: %clang_cc1 -std=c++2a -verify %s
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namespace Rel {
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struct A {
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int n;
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constexpr int operator<=>(A a) const { return n - a.n; }
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friend bool operator<(const A&, const A&) = default;
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friend bool operator<=(const A&, const A&) = default;
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friend bool operator>(const A&, const A&) = default;
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friend bool operator>=(const A&, const A&) = default;
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};
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static_assert(A{0} < A{1});
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static_assert(A{1} < A{1}); // expected-error {{failed}}
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static_assert(A{0} <= A{1});
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static_assert(A{1} <= A{1});
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static_assert(A{2} <= A{1}); // expected-error {{failed}}
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static_assert(A{1} > A{0});
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static_assert(A{1} > A{1}); // expected-error {{failed}}
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static_assert(A{1} >= A{0});
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static_assert(A{1} >= A{1});
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static_assert(A{1} >= A{2}); // expected-error {{failed}}
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struct B {
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bool operator<=>(B) const = delete; // expected-note 4{{deleted here}} expected-note-re 8{{candidate {{.*}} deleted}}
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friend bool operator<(const B&, const B&) = default; // expected-warning {{implicitly deleted}} expected-note {{because it would invoke a deleted comparison}} expected-note-re {{candidate {{.*}} deleted}}
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friend bool operator<=(const B&, const B&) = default; // expected-warning {{implicitly deleted}} expected-note {{because it would invoke a deleted comparison}} expected-note-re {{candidate {{.*}} deleted}}
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friend bool operator>(const B&, const B&) = default; // expected-warning {{implicitly deleted}} expected-note {{because it would invoke a deleted comparison}} expected-note-re {{candidate {{.*}} deleted}}
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friend bool operator>=(const B&, const B&) = default; // expected-warning {{implicitly deleted}} expected-note {{because it would invoke a deleted comparison}} expected-note-re {{candidate {{.*}} deleted}}
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};
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bool b1 = B() < B(); // expected-error {{deleted}}
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bool b2 = B() <= B(); // expected-error {{deleted}}
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bool b3 = B() > B(); // expected-error {{deleted}}
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bool b4 = B() >= B(); // expected-error {{deleted}}
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struct C {
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friend bool operator<=>(const C&, const C&);
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friend bool operator<(const C&, const C&); // expected-note {{because this non-rewritten comparison function would be the best match}}
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bool operator<(const C&) const = default; // expected-warning {{implicitly deleted}}
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bool operator>(const C&) const = default; // OK
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};
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}
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// Under P2002R0, operator!= follows these rules too.
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namespace NotEqual {
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struct A {
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int n;
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constexpr bool operator==(A a) const { return n == a.n; }
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friend bool operator!=(const A&, const A&) = default;
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};
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static_assert(A{1} != A{2});
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static_assert(A{1} != A{1}); // expected-error {{failed}}
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struct B {
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bool operator==(B) const = delete; // expected-note {{deleted here}} expected-note-re 2{{candidate {{.*}} deleted}}
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friend bool operator!=(const B&, const B&) = default; // expected-warning {{implicitly deleted}} expected-note {{because it would invoke a deleted comparison}} expected-note-re {{candidate {{.*}} deleted}}
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};
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bool b = B() != B(); // expected-error {{deleted}}
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struct C {
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friend bool operator==(const C&, const C&);
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friend bool operator!=(const C&, const C&); // expected-note {{because this non-rewritten comparison function would be the best match}}
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bool operator!=(const C&) const = default; // expected-warning {{implicitly deleted}}
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};
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// Ensure we don't go into an infinite loop diagnosing this: the first function
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// is deleted because it calls the second function, which is deleted because it
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// calls the first.
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struct Evil {
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friend bool operator!=(const Evil&, const Evil&) = default; // expected-warning {{implicitly deleted}} expected-note {{would be the best match}}
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bool operator!=(const Evil&) const = default; // expected-warning {{implicitly deleted}} expected-note {{would be the best match}}
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};
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}
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namespace Access {
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class A {
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int operator<=>(A) const; // expected-note {{private}}
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};
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struct B : A {
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friend bool operator<(const B&, const B&) = default; // expected-warning {{implicitly deleted}}
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// expected-note@-1 {{defaulted 'operator<' is implicitly deleted because it would invoke a private 'operator<=>' member of 'Access::A'}}
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};
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}
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