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* [committed] libstdc++: Implement LWG 3490 change to drop_while_view::begin()
@ 2021-05-21  4:07 Patrick Palka
  0 siblings, 0 replies; only message in thread
From: Patrick Palka @ 2021-05-21  4:07 UTC (permalink / raw)
  To: gcc-patches; +Cc: libstdc++, Patrick Palka

Tested on x86_64-pc-linux-gnu, committed to trunk as obvious.

libstdc++-v3/ChangeLog:

	PR libstdc++/100606
	* include/std/ranges (drop_while_view::begin): Assert the
	precondition added by LWG 3490.
---
 libstdc++-v3/include/std/ranges | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
index 767a65c5822..76add252ca6 100644
--- a/libstdc++-v3/include/std/ranges
+++ b/libstdc++-v3/include/std/ranges
@@ -2190,6 +2190,7 @@ namespace views::__adaptor
 	if (_M_cached_begin._M_has_value())
 	  return _M_cached_begin._M_get(_M_base);
 
+	__glibcxx_assert(_M_pred.has_value());
 	auto __it = __detail::find_if_not(ranges::begin(_M_base),
 					  ranges::end(_M_base),
 					  std::cref(*_M_pred));
-- 
2.32.0.rc0


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