Seastar
High performance C++ framework for concurrent servers
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used_size.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) 2020 ScyllaDB Ltd.
20 */
21
22#pragma once
23
24#ifndef SEASTAR_MODULE
25#include <stddef.h>
26#include <type_traits>
27#endif
28
29namespace seastar {
30namespace internal {
31// Empty types have a size of 1, but that byte is not actually
32// used. This helper is used to avoid accessing that byte.
33template<typename T>
34struct used_size {
35 static constexpr size_t value = std::is_empty_v<T> ? 0 : sizeof(T);
36};
37}
38}
Seastar API namespace.
Definition: abort_on_ebadf.hh:26