Upgrade to 2022-era LLVM LIBCXX

third_party/libcxx/__pstl/internal/utils.h

@@ -0,0 +1,144 @@
+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// 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 _PSTL_UTILS_H
+#define _PSTL_UTILS_H
+
+#include <__config>
+#include <__exception/terminate.h>
+#include <__utility/forward.h>
+#include <new>
+
+#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
+
+namespace __pstl {
+namespace __internal {
+
+template <typename _Fp>
+_LIBCPP_HIDE_FROM_ABI auto __except_handler(_Fp __f) -> decltype(__f()) {
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+  try {
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
+    return __f();
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+  } catch (const std::bad_alloc&) {
+    throw;            // re-throw bad_alloc according to the standard [algorithms.parallel.exceptions]
+  } catch (...) {
+    std::terminate(); // Good bye according to the standard [algorithms.parallel.exceptions]
+  }
+#endif // _LIBCPP_HAS_NO_EXCEPTIONS
+}
+
+template <typename _Fp>
+_LIBCPP_HIDE_FROM_ABI void __invoke_if(std::true_type, _Fp __f) {
+  __f();
+}
+
+template <typename _Fp>
+_LIBCPP_HIDE_FROM_ABI void __invoke_if(std::false_type, _Fp) {}
+
+template <typename _Fp>
+_LIBCPP_HIDE_FROM_ABI void __invoke_if_not(std::false_type, _Fp __f) {
+  __f();
+}
+
+template <typename _Fp>
+_LIBCPP_HIDE_FROM_ABI void __invoke_if_not(std::true_type, _Fp) {}
+
+template <typename _F1, typename _F2>
+_LIBCPP_HIDE_FROM_ABI auto __invoke_if_else(std::true_type, _F1 __f1, _F2) -> decltype(__f1()) {
+  return __f1();
+}
+
+template <typename _F1, typename _F2>
+_LIBCPP_HIDE_FROM_ABI auto __invoke_if_else(std::false_type, _F1, _F2 __f2) -> decltype(__f2()) {
+  return __f2();
+}
+
+//! Unary operator that returns reference to its argument.
+struct __no_op {
+  template <typename _Tp>
+  _LIBCPP_HIDE_FROM_ABI _Tp&& operator()(_Tp&& __a) const {
+    return std::forward<_Tp>(__a);
+  }
+};
+
+template <typename _Pred>
+class __reorder_pred {
+  _Pred __pred_;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI explicit __reorder_pred(_Pred __pred) : __pred_(__pred) {}
+
+  template <typename _FTp, typename _STp>
+  _LIBCPP_HIDE_FROM_ABI bool operator()(_FTp&& __a, _STp&& __b) {
+    return __pred_(std::forward<_STp>(__b), std::forward<_FTp>(__a));
+  }
+};
+
+//! Like a polymorphic lambda for pred(...,value)
+template <typename _Tp, typename _Predicate>
+class __equal_value_by_pred {
+  const _Tp& __value_;
+  _Predicate __pred_;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI __equal_value_by_pred(const _Tp& __value, _Predicate __pred)
+      : __value_(__value), __pred_(__pred) {}
+
+  template <typename _Arg>
+  _LIBCPP_HIDE_FROM_ABI bool operator()(_Arg&& __arg) {
+    return __pred_(std::forward<_Arg>(__arg), __value_);
+  }
+};
+
+//! Like a polymorphic lambda for ==value
+template <typename _Tp>
+class __equal_value {
+  const _Tp& __value_;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI explicit __equal_value(const _Tp& __value) : __value_(__value) {}
+
+  template <typename _Arg>
+  _LIBCPP_HIDE_FROM_ABI bool operator()(_Arg&& __arg) const {
+    return std::forward<_Arg>(__arg) == __value_;
+  }
+};
+
+//! Logical negation of ==value
+template <typename _Tp>
+class __not_equal_value {
+  const _Tp& __value_;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI explicit __not_equal_value(const _Tp& __value) : __value_(__value) {}
+
+  template <typename _Arg>
+  _LIBCPP_HIDE_FROM_ABI bool operator()(_Arg&& __arg) const {
+    return !(std::forward<_Arg>(__arg) == __value_);
+  }
+};
+
+template <typename _ForwardIterator, typename _Compare>
+_LIBCPP_HIDE_FROM_ABI _ForwardIterator
+__cmp_iterators_by_values(_ForwardIterator __a, _ForwardIterator __b, _Compare __comp) {
+  if (__a < __b) { // we should return closer iterator
+    return __comp(*__b, *__a) ? __b : __a;
+  } else {
+    return __comp(*__a, *__b) ? __a : __b;
+  }
+}
+
+} // namespace __internal
+} // namespace __pstl
+
+#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
+
+#endif /* _PSTL_UTILS_H */