Seastar
High performance C++ framework for concurrent servers
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align.hh
1/*
2 * This file is open source software, licensed to you under the terms
3 * of the Apache License, Version 2.0 (the "License"). See the NOTICE file
4 * distributed with this work for additional information regarding copyright
5 * ownership. You may not use this file except in compliance with the License.
6 *
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing,
12 * software distributed under the License is distributed on an
13 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14 * KIND, either express or implied. See the License for the
15 * specific language governing permissions and limitations
16 * under the License.
17 */
18/*
19 * Copyright (C) 2014 Cloudius Systems, Ltd.
20 */
21
22#pragma once
23
24#ifndef SEASTAR_MODULE
25#include <seastar/util/modules.hh>
26#include <cstdint>
27#include <cstdlib>
28#endif
29
30namespace seastar {
31
32SEASTAR_MODULE_EXPORT_BEGIN
33
34template <typename T>
35inline constexpr
36T align_up(T v, T align) {
37 return (v + align - 1) & ~(align - 1);
38}
39
40template <typename T>
41inline constexpr
42T* align_up(T* v, size_t align) {
43 static_assert(sizeof(T) == 1, "align byte pointers only");
44 return reinterpret_cast<T*>(align_up(reinterpret_cast<uintptr_t>(v), align));
45}
46
47template <typename T>
48inline constexpr
49T align_down(T v, T align) {
50 return v & ~(align - 1);
51}
52
53template <typename T>
54inline constexpr
55T* align_down(T* v, size_t align) {
56 static_assert(sizeof(T) == 1, "align byte pointers only");
57 return reinterpret_cast<T*>(align_down(reinterpret_cast<uintptr_t>(v), align));
58}
59
60SEASTAR_MODULE_EXPORT_END
61
62}
Seastar API namespace.
Definition: abort_on_ebadf.hh:26