added iOS source code

[wl-app.git] / iOS / Pods / Realm / include / core / realm / util / miscellaneous.hpp

diff --git a/iOS/Pods/Realm/include/core/realm/util/miscellaneous.hpp b/iOS/Pods/Realm/include/core/realm/util/miscellaneous.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 implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ **************************************************************************/
+
+#ifndef REALM_UTIL_MISCELLANEOUS_HPP
+#define REALM_UTIL_MISCELLANEOUS_HPP
+
+#include <type_traits>
+
+namespace realm {
+namespace util {
+
+// FIXME: Replace this with std::add_const_t when we switch over to C++14 by
+// default.
+/// \brief Adds const qualifier, unless T already has the const qualifier
+template <class T>
+using add_const_t = typename std::add_const<T>::type;
+
+// FIXME: Replace this with std::as_const when we switch over to C++17 by
+// default.
+/// \brief Forms an lvalue reference to const T
+template <class T>
+constexpr add_const_t<T>& as_const(T& v) noexcept
+{
+    return v;
+}
+
+/// \brief Disallows rvalue arguments
+template <class T>
+add_const_t<T>& as_const(const T&&) = delete;
+
+} // namespace util
+} // namespace realm
+
+#endif // REALM_UTIL_MISCELLANEOUS_HPP