[libcxx-commits] [libcxx] [libc++] Implement P0429R9 `std::flat_map` (PR #98643)

[Louis Dionne via libcxx-commits]

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@@ -0,0 +1,118 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_map>
+
+//       reverse_iterator rbegin() noexcept;
+// const_reverse_iterator rbegin() const noexcept;
+//       reverse_iterator rend()   noexcept;
+// const_reverse_iterator rend()   const noexcept;
+//
+// const_reverse_iterator crbegin() const noexcept;
+// const_reverse_iterator crend()   const noexcept;
+
+#include <cassert>
+#include <cstddef>
+#include <deque>
+#include <flat_map>
+#include <functional>
+#include <string>
+
+#include <iterator>
+
+#include "test_macros.h"
+#include <iostream>
+
+int main(int, char**) {
+  {
+    using M     = std::flat_map<int, char, std::less<int>, std::deque<int>, std::deque<char>>;
+    M m         = {{1, 'a'}, {2, 'b'}, {3, 'c'}, {4, 'd'}};
+    const M& cm = m;
+    ASSERT_SAME_TYPE(decltype(m.rbegin()), M::reverse_iterator);
+    ASSERT_SAME_TYPE(decltype(m.crbegin()), M::const_reverse_iterator);
+    ASSERT_SAME_TYPE(decltype(cm.rbegin()), M::const_reverse_iterator);
+    ASSERT_SAME_TYPE(decltype(m.rend()), M::reverse_iterator);
+    ASSERT_SAME_TYPE(decltype(m.crend()), M::const_reverse_iterator);
+    ASSERT_SAME_TYPE(decltype(cm.rend()), M::const_reverse_iterator);
+    static_assert(noexcept(m.rbegin()));
+    static_assert(noexcept(cm.rbegin()));
+    static_assert(noexcept(m.crbegin()));
+    static_assert(noexcept(m.rend()));
+    static_assert(noexcept(cm.rend()));
+    static_assert(noexcept(m.crend()));
+    assert(m.size() == 4);
+    assert(std::distance(m.rbegin(), m.rend()) == 4);
+    assert(std::distance(cm.rbegin(), cm.rend()) == 4);
+    assert(std::distance(m.crbegin(), m.crend()) == 4);
+    assert(std::distance(cm.crbegin(), cm.crend()) == 4);
+    M::reverse_iterator i; // default-construct
+    ASSERT_SAME_TYPE(decltype(i->first), const int&);
+    ASSERT_SAME_TYPE(decltype(i->second), char&);
+    i                           = m.rbegin(); // move-assignment
+    M::const_reverse_iterator k = i;          // converting constructor
+    assert(i == k);                           // comparison
+    for (int j = 4; j >= 1; --j, ++i) {       // pre-increment
+      assert(i->first == j);                  // operator->
+      assert(i->second == 'a' + j - 1);
+    }
+    assert(i == m.rend());
+    for (int j = 1; j <= 4; ++j) {
+      --i; // pre-decrement
+      assert((*i).first == j);
+      assert((*i).second == 'a' + j - 1);
+    }
+    assert(i == m.rbegin());
+  }
+// std::string is not a sequence container
+#if 0
----------------
ldionne wrote:

Can you look for all the `#if 0`s in your patch and remove them (unless they should be enabled)?

https://github.com/llvm/llvm-project/pull/98643