forked from OSchip/llvm-project
28 lines
970 B
C++
28 lines
970 B
C++
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// RUN: %clang_cc1 -std=c++2a -verify %s -fcxx-exceptions -triple=x86_64-linux-gnu
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namespace ThreeWayComparison {
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struct A {
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int n;
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constexpr friend int operator<=>(const A &a, const A &b) {
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return a.n < b.n ? -1 : a.n > b.n ? 1 : 0;
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}
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};
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static_assert(A{1} <=> A{2} < 0);
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static_assert(A{2} <=> A{1} > 0);
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static_assert(A{2} <=> A{2} == 0);
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// Note: not yet supported.
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static_assert(1 <=> 2 < 0); // expected-error {{invalid operands}}
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static_assert(2 <=> 1 > 0); // expected-error {{invalid operands}}
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static_assert(1 <=> 1 == 0); // expected-error {{invalid operands}}
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constexpr int k = (1 <=> 1, 0);
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// expected-error@-1 {{constexpr variable 'k' must be initialized by a constant expression}}
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// expected-warning@-2 {{three-way comparison result unused}}
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constexpr void f() { // expected-error {{constant expression}}
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void(1 <=> 1); // expected-note {{constant expression}}
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}
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// TODO: defaulted operator <=>
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}
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