MySQL 8.4.0
Source Code Documentation
pfs_std_allocator.h
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1/* Copyright (c) 2023, 2024, Oracle and/or its affiliates.
2
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5 as published by the Free Software Foundation.
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17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License, version 2.0, for more details.
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21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
23
24#ifndef PFS_STD_ALLOCATOR_H
25#define PFS_STD_ALLOCATOR_H
26
27#include "my_config.h"
28
29#include <memory>
30
31#include "my_compiler.h"
32#include "my_inttypes.h"
34
36
37template <class T>
39 public:
40 typedef T value_type;
41
43
44 template <class U>
45 constexpr PFS_std_allocator(const PFS_std_allocator<U> &u) noexcept
46 : m_klass(u.get_class()) {}
47
48 [[nodiscard]] T *allocate(std::size_t n) {
49 if (n > std::numeric_limits<std::size_t>::max() / sizeof(T))
50 throw std::bad_array_new_length();
51
52 const size_t size = n * sizeof(T);
53 void *mem = pfs_malloc(m_klass, size, MYF(0));
54 if (mem == nullptr) {
55 throw std::bad_alloc();
56 }
57 return static_cast<T *>(mem);
58 }
59
60 void deallocate(T *p, std::size_t n) noexcept {
61 const size_t size = n * sizeof(T);
63 }
64
66
67 private:
69};
70
71template <class T, class U>
73 return (t.m_klass == u.m_klass);
74}
75
76template <class T, class U>
78 return (t.m_klass != u.m_klass);
79}
80
81#endif
const char * p
Definition: ctype-mb.cc:1235
Header for compiler-dependent features.
Some integer typedefs for easier portability.
#define MYF(v)
Definition: my_inttypes.h:97
size_t size(const char *const c)
Definition: base64.h:46
void * pfs_malloc(PFS_builtin_memory_class *klass, size_t size, myf flags)
Memory allocation for the performance schema.
Definition: pfs_global.cc:61
void pfs_free(PFS_builtin_memory_class *klass, size_t size, void *ptr)
Free memory allocated with.
Definition: pfs_global.cc:108
Miscellaneous global dependencies (declarations).
bool operator==(const PFS_std_allocator< T > &t, const PFS_std_allocator< U > &u)
Definition: pfs_std_allocator.h:72
bool operator!=(const PFS_std_allocator< T > &t, const PFS_std_allocator< U > &u)
Definition: pfs_std_allocator.h:77
static MEM_ROOT mem
Definition: sql_servers.cc:100
Definition: pfs_builtin_memory.h:39
Definition: pfs_std_allocator.h:38
PFS_builtin_memory_class * m_klass
Definition: pfs_std_allocator.h:68
PFS_std_allocator(PFS_builtin_memory_class *klass)
Definition: pfs_std_allocator.h:42
void deallocate(T *p, std::size_t n) noexcept
Definition: pfs_std_allocator.h:60
T value_type
Definition: pfs_std_allocator.h:40
PFS_builtin_memory_class * get_class() const
Definition: pfs_std_allocator.h:65
T * allocate(std::size_t n)
Definition: pfs_std_allocator.h:48
constexpr PFS_std_allocator(const PFS_std_allocator< U > &u) noexcept
Definition: pfs_std_allocator.h:45
int n
Definition: xcom_base.cc:509