1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
//
#pragma once
#include <algorithm>
#include "rocksdb/memory_allocator.h"
namespace ROCKSDB_NAMESPACE {
struct CustomDeleter {
CustomDeleter(MemoryAllocator* a = nullptr) : allocator(a) {}
void operator()(char* ptr) const {
if (allocator) {
allocator->Deallocate(ptr);
} else {
delete[] ptr;
}
}
MemoryAllocator* allocator;
};
using CacheAllocationPtr = std::unique_ptr<char[], CustomDeleter>;
inline CacheAllocationPtr AllocateBlock(size_t size,
MemoryAllocator* allocator) {
if (allocator) {
auto block = reinterpret_cast<char*>(allocator->Allocate(size));
return CacheAllocationPtr(block, allocator);
}
return CacheAllocationPtr(new char[size]);
}
inline CacheAllocationPtr AllocateAndCopyBlock(const Slice& data,
MemoryAllocator* allocator) {
CacheAllocationPtr cap = AllocateBlock(data.size(), allocator);
std::copy_n(data.data(), data.size(), cap.get());
return cap;
}
} // namespace ROCKSDB_NAMESPACE
|
