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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 | #include <cstdint> | |
25 | #include <cstdlib> | |
26 | ||
27 | namespace seastar { | |
28 | ||
29 | template <typename T> | |
30 | inline constexpr | |
31 | T align_up(T v, T align) { | |
32 | return (v + align - 1) & ~(align - 1); | |
33 | } | |
34 | ||
35 | template <typename T> | |
36 | inline constexpr | |
37 | T* align_up(T* v, size_t align) { | |
38 | static_assert(sizeof(T) == 1, "align byte pointers only"); | |
39 | return reinterpret_cast<T*>(align_up(reinterpret_cast<uintptr_t>(v), align)); | |
40 | } | |
41 | ||
42 | template <typename T> | |
43 | inline constexpr | |
44 | T align_down(T v, T align) { | |
45 | return v & ~(align - 1); | |
46 | } | |
47 | ||
48 | template <typename T> | |
49 | inline constexpr | |
50 | T* align_down(T* v, size_t align) { | |
51 | static_assert(sizeof(T) == 1, "align byte pointers only"); | |
52 | return reinterpret_cast<T*>(align_down(reinterpret_cast<uintptr_t>(v), align)); | |
53 | } | |
54 | ||
55 | } |