added test

Author: huixie90

libcxx/test/std/containers/container.adaptors/flat.set/robust_against_nonbool.compile.pass.cpp

@@ -0,0 +1,44 @@
+//===----------------------------------------------------------------------===//
+//
+// 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, c++20
+
+// <flat_set>
+//
+// flat_set should support comparator that return a non-boolean
+// value as long as the returned type is implicitly convertible to bool.
+
+#include <flat_set>
+#include <vector>
+#include <ranges>
+
+#include "boolean_testable.h"
+
+void test() {
+  using Key = StrictComparable<int>;
+  std::vector<Key> v;
+  std::flat_set<Key> m1;
+  std::flat_set m2(std::from_range, v, StrictBinaryPredicate);
+  std::flat_set m3(std::sorted_unique, v, StrictBinaryPredicate);
+  std::flat_set m4(m1.begin(), m1.end(), StrictBinaryPredicate);
+  m2.insert(m1.begin(), m1.end());
+  m2.insert(std::sorted_unique, m1.begin(), m1.end());
+  m2.insert_range(m1);
+  m3.insert(1);
+  m2.emplace(1);
+  m2.emplace_hint(m2.begin(), 1);
+  for (const auto& k : m2) {
+    (void)k;
+  }
+  (void)m2.find(Key{1});
+  (void)m2.equal_range(Key{1});
+  (void)(m2 == m2);
+  m2.erase(m2.begin());
+  m2.erase(m2.begin(), m2.end());
+  std::erase_if(m2, []<class T>(const StrictComparable<T>&) -> BooleanTestable const& { return yes; });
+}