38 lines
1.8 KiB
Diff
38 lines
1.8 KiB
Diff
From 42ca72bf3a161cf8d5e43f5d4f68aeeec3f7e6b4 Mon Sep 17 00:00:00 2001
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From: Kent Ross <k@mad.cash>
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Date: Thu, 3 Nov 2022 20:17:41 -0700
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Subject: [PATCH 6/7] do not define operator!= in C++20
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A change to the semantics of equality operator rewriting in C++20 (P2468R2: The Equality Operator You Are Looking For) means that operator== may not be rewritten with reversed operands if operator!= is also defined. Since operator!= can normally be synthesized from operator== regardless in this language standard, we can and should avoid defining those when the new language semantics are available.
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This fixes the compilation of tests (and probably consuming code) in C++20 onwards for compilers that implement this new semantic, including recent nightly builds of clang-16.
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Reference: https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p2468r2.html
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---
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include/rapidjson/document.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
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index 46510f85..8b0446db 100644
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--- a/include/rapidjson/document.h
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+++ b/include/rapidjson/document.h
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@@ -912,6 +912,7 @@ public:
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*/
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template <typename T> RAPIDJSON_DISABLEIF_RETURN((internal::OrExpr<internal::IsPointer<T>,internal::IsGenericValue<T> >), (bool)) operator==(const T& rhs) const { return *this == GenericValue(rhs); }
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+#ifndef __cpp_impl_three_way_comparison
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//! Not-equal-to operator
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/*! \return !(*this == rhs)
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*/
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@@ -926,7 +927,6 @@ public:
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*/
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template <typename T> RAPIDJSON_DISABLEIF_RETURN((internal::IsGenericValue<T>), (bool)) operator!=(const T& rhs) const { return !(*this == rhs); }
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-#ifndef __cpp_impl_three_way_comparison
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//! Equal-to operator with arbitrary types (symmetric version)
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/*! \return (rhs == lhs)
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*/
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--
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2.43.0
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