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[tuple.syn] fix ignore-type::operator= return type #7840

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[tuple.syn] fix ignore-type::operator= return type #7840

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Tsche
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@Tsche Tsche commented Apr 15, 2025

ignore-type's operator= is currently specified as

constexpr const ignore-type operator=(const auto &) const noexcept { return *this; }

this should instead return const ignore-type&.

@Eisenwave noted P2968R2 specifies ignore-type as

+// ignore
+struct ignore-type { // exposition only
+  constexpr const ignore-type&
+    operator=(const auto &) const noexcept
+      { return *this; }
+};
+inline constexpr ignore-type ignore;
// 22.4.5, tuple creation functions
-inline constexpr unspecified ignore;

however, #7109 drops the reference qualification on ignore-type::operator='s return type. Therefore I believe this is an editorial issue.

@jensmaurer
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@jwakely , do you agree?

jwakely
jwakely approved these changes Apr 22, 2025
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I agree

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@jwakely jwakely jwakely approved these changes

@jensmaurer jensmaurer jensmaurer approved these changes

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@Tsche @jensmaurer @jwakely