added iOS source code

[wl-app.git] / iOS / Pods / Realm / include / util / aligned_union.hpp

diff --git a/iOS/Pods/Realm/include/util/aligned_union.hpp b/iOS/Pods/Realm/include/util/aligned_union.hpp
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+////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2016 Realm Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or utilied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////
+
+#ifndef REALM_OS_ALIGNED_UNION_HPP
+#define REALM_OS_ALIGNED_UNION_HPP
+
+#include <cstddef>
+#include <initializer_list>
+#include <type_traits>
+
+namespace realm {
+
+// Provide our own implementation of max as GCC 4.9's is not marked as constexpr.
+namespace _impl {
+
+template <typename T>
+static constexpr const T& constexpr_max(const T& a, const T& b)
+{
+    return a > b ? a : b;
+}
+
+template <typename T>
+static constexpr const T& constexpr_max(const T* begin, const T *end)
+{
+    return begin + 1 == end ? *begin : constexpr_max(*begin, constexpr_max(begin + 1, end));
+}
+
+template <typename T>
+static constexpr const T& constexpr_max(std::initializer_list<T> list)
+{
+    return constexpr_max(list.begin(), list.end());
+}
+
+} // namespace _impl
+
+namespace util {
+
+// Provide our own implementation of `std::aligned_union` as it is missing from GCC 4.9.
+template <size_t Len, typename... Types>
+struct AlignedUnion
+{
+    static constexpr size_t alignment_value = _impl::constexpr_max({alignof(Types)...});
+    static constexpr size_t storage_size = _impl::constexpr_max({Len, sizeof(Types)...});
+    using type = typename std::aligned_storage<storage_size, alignment_value>::type;
+};
+
+} // namespace util
+} // namespace realm
+
+#endif // REALM_OS_ALIGNED_UNION_HPP