Initial commit

module/jni/libcxx/test/std/utilities/function.objects/range.cmp/less.pass.cpp

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+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17
+
+// <functional>
+
+// ranges::less
+
+#include <functional>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+#include "compare_types.h"
+#include "MoveOnly.h"
+#include "pointer_comparison_test_helper.h"
+
+struct NotTotallyOrdered {
+  friend bool operator<(const NotTotallyOrdered&, const NotTotallyOrdered&);
+};
+
+static_assert(!std::is_invocable_v<std::ranges::less, NotTotallyOrdered, NotTotallyOrdered>);
+static_assert(!std::is_invocable_v<std::ranges::less, int, MoveOnly>);
+static_assert(std::is_invocable_v<std::ranges::less, explicit_operators, explicit_operators>);
+
+static_assert(requires { typename std::ranges::less::is_transparent; });
+
+constexpr bool test() {
+  auto fn = std::ranges::less();
+
+  assert(fn(MoveOnly(41), MoveOnly(42)));
+
+  ForwardingTestObject a;
+  ForwardingTestObject b;
+  assert(!fn(a, b));
+  assert(fn(std::move(a), std::move(b)));
+
+  assert(fn(1, 2));
+  assert(!fn(2, 2));
+  assert(!fn(2, 1));
+
+  assert(!fn(2, 1L));
+
+  return true;
+}
+
+int main(int, char**) {
+
+  test();
+  static_assert(test());
+
+  // test total ordering of int* for less<int*> and less<void>.
+  do_pointer_comparison_test(std::ranges::less());
+
+  return 0;
+}