LWG3755 tuple-for-each can call user-defined operator,

burblebee · tkoeppe · commit bdf9fd3ff9da · 2022-12-15T14:16:40.000Z
diff --git a/source/ranges.tex b/source/ranges.tex
@@ -4275,7 +4275,7 @@
   template<class F, class Tuple>
   constexpr void @\exposid{tuple-for-each}@(F&& f, Tuple&& t) { // \expos
     apply([&]<class... Ts>(Ts&&... elements) {
-      (invoke(f, std::forward<Ts>(elements)), ...);
+      (static_cast<void>(invoke(f, std::forward<Ts>(elements))), ...);
     }, std::forward<Tuple>(t));
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -4275,7 +4275,7 @@`
`4275`	`4275`	`template<class F, class Tuple>`
`4276`	`4276`	`constexpr void @\exposid{tuple-for-each}@(F&& f, Tuple&& t) { // \expos`
`4277`	`4277`	`apply([&]<class... Ts>(Ts&&... elements) {`
`4278`		`- (invoke(f, std::forward<Ts>(elements)), ...);`
	`4278`	`+ (static_cast<void>(invoke(f, std::forward<Ts>(elements))), ...);`
`4279`	`4279`	`}, std::forward<Tuple>(t));`
`4280`	`4280`	`}`
`4281`	`4281`	`}`