Add the deleted string_view(std::nullptr_t) constructor from C++23

derekmauro · copybara-github · commit 69e7e0a38389 · 2025-11-21T14:07:24.000-08:00
This will reject string_view(nullptr) at compile-time.

PiperOrigin-RevId: 835352115
Change-Id: Ic68e55d3eba02e002ed5f1791c40efbb0f0daaf0
diff --git a/absl/strings/string_view.h b/absl/strings/string_view.h
@@ -246,6 +246,9 @@ class ABSL_ATTRIBUTE_VIEW string_view {
   }
 #endif  // ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L
 
+  // Deleted constructor from std::nullptr_t from C++23.
+  string_view(std::nullptr_t) = delete;
+
   constexpr string_view(const string_view&) noexcept = default;
   string_view& operator=(const string_view&) noexcept = default;
 

Original file line number	Diff line number	Diff line change
`@@ -246,6 +246,9 @@ class ABSL_ATTRIBUTE_VIEW string_view {`
`246`	`246`	`}`
`247`	`247`	`#endif // ABSL_INTERNAL_CPLUSPLUS_LANG >= 202002L`
`248`	`248`
	`249`	`+ // Deleted constructor from std::nullptr_t from C++23.`
	`250`	`+ string_view(std::nullptr_t) = delete;`
	`251`	`+`
`249`	`252`	`constexpr string_view(const string_view&) noexcept = default;`
`250`	`253`	`string_view& operator=(const string_view&) noexcept = default;`
`251`	`254`