205 lines
10 KiB
C++
205 lines
10 KiB
C++
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// This test is for the [class.compare.default]p3 added by P2002R0
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// RUN: %clang_cc1 -std=c++2a -verify %s
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namespace std {
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struct strong_ordering {
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int n;
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constexpr operator int() const { return n; }
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static const strong_ordering less, equal, greater;
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};
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constexpr strong_ordering strong_ordering::less = {-1};
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constexpr strong_ordering strong_ordering::equal = {0};
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constexpr strong_ordering strong_ordering::greater = {1};
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}
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struct A {
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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 std::strong_ordering 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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friend bool operator>=(const A&, const A&) = default;
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};
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struct TestA {
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friend constexpr bool operator==(const A&, const A&) noexcept;
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friend constexpr bool operator!=(const A&, const A&) noexcept;
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friend constexpr std::strong_ordering operator<=>(const A&, const A&) noexcept;
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friend constexpr bool operator<(const A&, const A&);
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friend constexpr bool operator<=(const A&, const A&);
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friend constexpr bool operator>(const A&, const A&);
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friend constexpr bool operator>=(const A&, const A&);
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};
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// Declaration order doesn't matter, even though the secondary operators need
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// to know whether the primary ones are constexpr.
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struct ReversedA {
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friend bool operator>=(const ReversedA&, const ReversedA&) = default;
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friend bool operator>(const ReversedA&, const ReversedA&) = default;
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friend bool operator<=(const ReversedA&, const ReversedA&) = default;
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friend bool operator<(const ReversedA&, const ReversedA&) = default;
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friend std::strong_ordering operator<=>(const ReversedA&, const ReversedA&) = default;
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friend bool operator!=(const ReversedA&, const ReversedA&) = default;
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friend bool operator==(const ReversedA&, const ReversedA&) = default;
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};
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struct TestReversedA {
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friend constexpr bool operator>=(const ReversedA&, const ReversedA&);
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friend constexpr bool operator>(const ReversedA&, const ReversedA&);
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friend constexpr bool operator<=(const ReversedA&, const ReversedA&);
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friend constexpr bool operator<(const ReversedA&, const ReversedA&);
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friend constexpr std::strong_ordering operator<=>(const ReversedA&, const ReversedA&) noexcept;
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friend constexpr bool operator!=(const ReversedA&, const ReversedA&) noexcept;
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friend constexpr bool operator==(const ReversedA&, const ReversedA&) noexcept;
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};
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struct B {
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A a;
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friend bool operator==(const B&, const B&) = default;
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friend bool operator!=(const B&, const B&) = default;
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friend std::strong_ordering operator<=>(const B&, const B&) = default;
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friend bool operator<(const B&, const B&) = default;
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friend bool operator<=(const B&, const B&) = default;
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friend bool operator>(const B&, const B&) = default;
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friend bool operator>=(const B&, const B&) = default;
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};
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struct TestB {
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friend constexpr bool operator==(const B&, const B&) noexcept;
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friend constexpr bool operator!=(const B&, const B&) noexcept;
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friend constexpr std::strong_ordering operator<=>(const B&, const B&);
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friend constexpr bool operator<(const B&, const B&);
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friend constexpr bool operator<=(const B&, const B&);
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friend constexpr bool operator>(const B&, const B&);
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friend constexpr bool operator>=(const B&, const B&);
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};
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struct C {
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friend bool operator==(const C&, const C&); // expected-note {{previous}} expected-note 2{{here}}
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friend bool operator!=(const C&, const C&) = default; // expected-note {{previous}}
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friend std::strong_ordering operator<=>(const C&, const C&); // expected-note {{previous}} expected-note 2{{here}}
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friend bool operator<(const C&, const C&) = default; // expected-note {{previous}}
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friend bool operator<=(const C&, const C&) = default; // expected-note {{previous}}
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friend bool operator>(const C&, const C&) = default; // expected-note {{previous}}
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friend bool operator>=(const C&, const C&) = default; // expected-note {{previous}}
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};
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struct TestC {
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friend constexpr bool operator==(const C&, const C&); // expected-error {{non-constexpr}}
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friend constexpr bool operator!=(const C&, const C&); // expected-error {{non-constexpr}}
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friend constexpr std::strong_ordering operator<=>(const C&, const C&); // expected-error {{non-constexpr}}
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friend constexpr bool operator<(const C&, const C&); // expected-error {{non-constexpr}}
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friend constexpr bool operator<=(const C&, const C&); // expected-error {{non-constexpr}}
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friend constexpr bool operator>(const C&, const C&); // expected-error {{non-constexpr}}
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friend constexpr bool operator>=(const C&, const C&); // expected-error {{non-constexpr}}
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};
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struct D {
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A a;
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C c;
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A b;
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friend bool operator==(const D&, const D&) = default; // expected-note {{previous}}
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friend bool operator!=(const D&, const D&) = default; // expected-note {{previous}}
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friend std::strong_ordering operator<=>(const D&, const D&) = default; // expected-note {{previous}}
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friend bool operator<(const D&, const D&) = default; // expected-note {{previous}}
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friend bool operator<=(const D&, const D&) = default; // expected-note {{previous}}
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friend bool operator>(const D&, const D&) = default; // expected-note {{previous}}
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friend bool operator>=(const D&, const D&) = default; // expected-note {{previous}}
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};
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struct TestD {
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friend constexpr bool operator==(const D&, const D&); // expected-error {{non-constexpr}}
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friend constexpr bool operator!=(const D&, const D&); // expected-error {{non-constexpr}}
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friend constexpr std::strong_ordering operator<=>(const D&, const D&); // expected-error {{non-constexpr}}
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friend constexpr bool operator<(const D&, const D&); // expected-error {{non-constexpr}}
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friend constexpr bool operator<=(const D&, const D&); // expected-error {{non-constexpr}}
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friend constexpr bool operator>(const D&, const D&); // expected-error {{non-constexpr}}
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friend constexpr bool operator>=(const D&, const D&); // expected-error {{non-constexpr}}
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};
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struct E {
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A a;
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C c; // expected-note 2{{non-constexpr comparison function would be used to compare member 'c'}}
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A b;
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friend constexpr bool operator==(const E&, const E&) = default; // expected-error {{cannot be declared constexpr because it invokes a non-constexpr comparison function}}
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friend constexpr bool operator!=(const E&, const E&) = default;
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friend constexpr std::strong_ordering operator<=>(const E&, const E&) = default; // expected-error {{cannot be declared constexpr because it invokes a non-constexpr comparison function}}
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friend constexpr bool operator<(const E&, const E&) = default;
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friend constexpr bool operator<=(const E&, const E&) = default;
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friend constexpr bool operator>(const E&, const E&) = default;
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friend constexpr bool operator>=(const E&, const E&) = default;
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};
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struct E2 : A, C { // expected-note 2{{non-constexpr comparison function would be used to compare base class 'C'}}
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friend constexpr bool operator==(const E2&, const E2&) = default; // expected-error {{cannot be declared constexpr because it invokes a non-constexpr comparison function}}
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friend constexpr bool operator!=(const E2&, const E2&) = default;
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friend constexpr std::strong_ordering operator<=>(const E2&, const E2&) = default; // expected-error {{cannot be declared constexpr because it invokes a non-constexpr comparison function}}
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friend constexpr bool operator<(const E2&, const E2&) = default;
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friend constexpr bool operator<=(const E2&, const E2&) = default;
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friend constexpr bool operator>(const E2&, const E2&) = default;
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friend constexpr bool operator>=(const E2&, const E2&) = default;
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};
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struct F {
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friend bool operator==(const F&, const F&); // expected-note {{here}}
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friend constexpr bool operator!=(const F&, const F&) = default; // expected-error {{cannot be declared constexpr because it invokes a non-constexpr comparison function}}
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friend std::strong_ordering operator<=>(const F&, const F&); // expected-note 4{{here}}
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friend constexpr bool operator<(const F&, const F&) = default; // expected-error {{cannot be declared constexpr because it invokes a non-constexpr comparison function}}
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friend constexpr bool operator<=(const F&, const F&) = default; // expected-error {{cannot be declared constexpr because it invokes a non-constexpr comparison function}}
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friend constexpr bool operator>(const F&, const F&) = default; // expected-error {{cannot be declared constexpr because it invokes a non-constexpr comparison function}}
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friend constexpr bool operator>=(const F&, const F&) = default; // expected-error {{cannot be declared constexpr because it invokes a non-constexpr comparison function}}
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};
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// No implicit 'constexpr' if it's not the first declaration.
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// FIXME: This rule creates problems for reordering of declarations; is this
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// really the right model?
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struct G;
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bool operator==(const G&, const G&);
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bool operator!=(const G&, const G&);
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std::strong_ordering operator<=>(const G&, const G&);
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bool operator<(const G&, const G&);
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bool operator<=(const G&, const G&);
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bool operator>(const G&, const G&);
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bool operator>=(const G&, const G&);
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struct G {
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friend bool operator==(const G&, const G&) = default;
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friend bool operator!=(const G&, const G&) = default;
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friend std::strong_ordering operator<=>(const G&, const G&) = default;
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friend bool operator<(const G&, const G&) = default;
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friend bool operator<=(const G&, const G&) = default;
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friend bool operator>(const G&, const G&) = default;
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friend bool operator>=(const G&, const G&) = default;
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};
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bool operator==(const G&, const G&);
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bool operator!=(const G&, const G&);
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std::strong_ordering operator<=>(const G&, const G&);
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bool operator<(const G&, const G&);
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bool operator<=(const G&, const G&);
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bool operator>(const G&, const G&);
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bool operator>=(const G&, const G&);
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namespace PR44721 {
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template <typename T> bool operator==(T const &, T const &) { return true; }
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template <typename T, typename U> bool operator!=(T const &, U const &) { return true; }
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template <typename T> int operator<=>(T const &, T const &) { return 0; }
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struct S {
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friend bool operator==(const S &, const S &) = default;
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friend bool operator<=>(const S &, const S &) = default;
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int x;
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};
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}
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