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12471842 PL |
1 | /* |
2 | * This file is part of PowerDNS or dnsdist. | |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
5cf909f3 AN |
22 | #ifndef LAZY_ALLOCATOR_HH |
23 | #define LAZY_ALLOCATOR_HH | |
24 | ||
25 | #include <cstddef> | |
26 | #include <utility> | |
27 | #include <type_traits> | |
28 | ||
29 | template <typename T> | |
30 | struct lazy_allocator { | |
31 | using value_type = T; | |
32 | using pointer = T*; | |
33 | using size_type = std::size_t; | |
34 | static_assert (std::is_trivial<T>::value, | |
35 | "lazy_allocator must only be used with trivial types"); | |
36 | ||
37 | pointer | |
38 | allocate (size_type const n) { | |
39 | return static_cast<pointer>(::operator new (n * sizeof(value_type))); | |
40 | } | |
41 | ||
42 | void | |
43 | deallocate (pointer const ptr, size_type const n) noexcept { | |
44 | #if defined(__cpp_sized_deallocation) && (__cpp_sized_deallocation >= 201309) | |
45 | ::operator delete (ptr, n * sizeof(value_type)); | |
46 | #else | |
47 | (void) n; | |
48 | ::operator delete (ptr); | |
49 | #endif | |
50 | } | |
51 | ||
52 | void construct (T*) const noexcept {} | |
53 | ||
54 | template <typename X, typename... Args> | |
55 | void | |
56 | construct (X* place, Args&&... args) const noexcept { | |
57 | new (static_cast<void*>(place)) X (std::forward<Args>(args)...); | |
58 | } | |
59 | }; | |
60 | ||
61 | template <typename T> inline | |
62 | bool operator== (lazy_allocator<T> const&, lazy_allocator<T> const&) noexcept { | |
63 | return true; | |
64 | } | |
65 | ||
66 | template <typename T> inline | |
67 | bool operator!= (lazy_allocator<T> const&, lazy_allocator<T> const&) noexcept { | |
68 | return false; | |
69 | } | |
70 | ||
71 | #endif // LAZY_ALLOCATOR_HH |