text: /*
   * This file is open source software, licensed to you under the terms
   * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
   * distributed with this work for additional information regarding copyright
   * ownership.  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.
   */
  /*
   * Copyright (C) 2014 Cloudius Systems, Ltd.
   */
  
  #ifndef ALIGN_HH_
  #define ALIGN_HH_
  
  #include <cstdint>
  #include <cstdlib>
  
  namespace seastar {
  
  template <typename T>
  inline constexpr
  T align_up(T v, T align) {
      return (v + align - 1) & ~(align - 1);
  }
  
  template <typename T>
  inline constexpr
  T* align_up(T* v, size_t align) {
      static_assert(sizeof(T) == 1, "align byte pointers only");
      return reinterpret_cast<T*>(align_up(reinterpret_cast<uintptr_t>(v), align));
  }
  
  template <typename T>
  inline constexpr
  T align_down(T v, T align) {
      return v & ~(align - 1);
  }
  
  template <typename T>
  inline constexpr
  T* align_down(T* v, size_t align) {
      static_assert(sizeof(T) == 1, "align byte pointers only");
      return reinterpret_cast<T*>(align_down(reinterpret_cast<uintptr_t>(v), align));
  }
  
  
  template <typename T>
  inline bool is_aligned(const T* v) {
      return (uintptr_t)(const void *)(v) % sizeof(T) == 0;
  }
  
  }
  
  #endif /* ALIGN_HH_ */
  