Import Cobalt 24.master.0.1032339
diff --git a/third_party/llvm-project/libcxx/include/__algorithm/lower_bound.h b/third_party/llvm-project/libcxx/include/__algorithm/lower_bound.h
new file mode 100644
index 0000000..2648982
--- /dev/null
+++ b/third_party/llvm-project/libcxx/include/__algorithm/lower_bound.h
@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ALGORITHM_LOWER_BOUND_H
+#define _LIBCPP___ALGORITHM_LOWER_BOUND_H
+
+#include <__algorithm/comp.h>
+#include <__algorithm/half_positive.h>
+#include <__algorithm/iterator_operations.h>
+#include <__config>
+#include <__functional/identity.h>
+#include <__functional/invoke.h>
+#include <__iterator/advance.h>
+#include <__iterator/distance.h>
+#include <__iterator/iterator_traits.h>
+#include <__type_traits/is_callable.h>
+#include <__type_traits/remove_reference.h>
+#include <type_traits>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _AlgPolicy, class _Iter, class _Sent, class _Type, class _Proj, class _Comp>
+_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+_Iter __lower_bound_impl(_Iter __first, _Sent __last, const _Type& __value, _Comp& __comp, _Proj& __proj) {
+ auto __len = _IterOps<_AlgPolicy>::distance(__first, __last);
+
+ while (__len != 0) {
+ auto __l2 = std::__half_positive(__len);
+ _Iter __m = __first;
+ _IterOps<_AlgPolicy>::advance(__m, __l2);
+ if (std::__invoke(__comp, std::__invoke(__proj, *__m), __value)) {
+ __first = ++__m;
+ __len -= __l2 + 1;
+ } else {
+ __len = __l2;
+ }
+ }
+ return __first;
+}
+
+template <class _ForwardIterator, class _Tp, class _Compare>
+_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+_ForwardIterator lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) {
+ static_assert(__is_callable<_Compare, decltype(*__first), const _Tp&>::value,
+ "The comparator has to be callable");
+ auto __proj = std::__identity();
+ return std::__lower_bound_impl<_ClassicAlgPolicy>(__first, __last, __value, __comp, __proj);
+}
+
+template <class _ForwardIterator, class _Tp>
+_LIBCPP_NODISCARD_EXT inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20
+_ForwardIterator lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
+ return std::lower_bound(__first, __last, __value,
+ __less<typename iterator_traits<_ForwardIterator>::value_type, _Tp>());
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ALGORITHM_LOWER_BOUND_H
