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libstdc++: Implement LWG 3490 change to drop_while_view::begin()

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libstdc++-v3/ChangeLog:

	PR libstdc++/100606
	* include/std/ranges (drop_while_view::begin): Assert the
	precondition added by LWG 3490.
This commit is contained in:
Patrick Palka 2021-05-21 00:05:18 -04:00
parent 317a38cd46
commit 11784fe27d
1 changed files with 1 additions and 0 deletions
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libstdc++-v3/include/std/ranges
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@ -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));