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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
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