Seastar
High performance C++ framework for concurrent servers
array_map.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
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9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
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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 <array>
26#include <cstddef>
27#include <stdexcept>
28#include <string>
29#include <utility>
30#include <seastar/util/modules.hh>
31#endif
32
33namespace seastar {
34
35// unordered_map implemented as a simple array
36
37SEASTAR_MODULE_EXPORT
38template <typename Value, size_t Max>
39class array_map {
40 std::array<Value, Max> _a {};
41public:
42 array_map(std::initializer_list<std::pair<size_t, Value>> i) {
43 for (auto kv : i) {
44 _a[kv.first] = kv.second;
45 }
46 }
47 Value& operator[](size_t key) { return _a[key]; }
48 const Value& operator[](size_t key) const { return _a[key]; }
49
50 Value& at(size_t key) {
51 if (key >= Max) {
52 throw std::out_of_range(std::to_string(key) + " >= " + std::to_string(Max));
53 }
54 return _a[key];
55 }
56};
57
58}
Definition: array_map.hh:39
Seastar API namespace.
Definition: abort_on_ebadf.hh:26