// Copyright 2023 PingCAP, 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.

#pragma once

#include <string.h>

#include <type_traits>


template <typename T>
inline T unalignedLoad(const void * address)
{
    T res{};
    memcpy(&res, address, sizeof(res));
    return res;
}

/// We've had troubles before with wrong store size due to integral promotions
/// (e.g., unalignedStore(dest, uint16_t + uint16_t) stores an uint32_t).
/// To prevent this, make the caller specify the stored type explicitly.
/// To disable deduction of T, wrap the argument type with std::enable_if.
template <typename T>
inline void unalignedStore(void * address, const typename std::enable_if<true, T>::type & src)
{
    static_assert(std::is_trivially_copyable_v<T>);
    memcpy(address, &src, sizeof(src));
}