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974c8b7e2f
This adds support for rewriting <, >, <=, and >= to a normal or reversed call to operator<=>, for rewriting != to a normal or reversed call to operator==, and for rewriting <=> and == to reversed forms of those same operators. Note that this is a breaking change for various C++17 code patterns, including some in use in LLVM. The most common patterns (where an operator== becomes ambiguous with a reversed form of itself) are still accepted under this patch, as an extension (with a warning). I'm hopeful that we can get the language rules fixed before C++20 ships, and the extension warning is aimed primarily at providing data to inform that decision. llvm-svn: 375306
42 lines
723 B
C++
42 lines
723 B
C++
// RUN: %clang_cc1 -pedantic-errors -std=c++2a -emit-pch %s -o %t
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// RUN: %clang_cc1 -pedantic-errors -std=c++2a -include-pch %t -verify %s
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// RUN: %clang_cc1 -pedantic-errors -std=c++2a -include-pch %t -emit-llvm %s -o -
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#ifndef HEADER
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#define HEADER
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#include "Inputs/std-compare.h"
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constexpr auto foo() {
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return (42 <=> 101);
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}
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inline auto bar(int x) {
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return (1 <=> x);
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}
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struct X {
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int a;
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friend constexpr std::strong_ordering operator<=>(const X &x, const X &y) {
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return x.a <=> y.a;
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}
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};
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constexpr auto baz(int x) {
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return X{3} < X{x};
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}
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#else
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// expected-no-diagnostics
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static_assert(foo() < 0);
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auto bar2(int x) {
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return bar(x);
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}
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static_assert(!baz(3));
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static_assert(baz(4));
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#endif
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