blob: 7afad5f8a6cbde266699f011b52c8ef342df4d5e (
plain)
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
48
49
50
51
52
53
|
#pragma once
#include "handle-fwd.hpp"
#include "compat/defs.hpp"
#include <array>
#include <cr/BitArray.h>
namespace floormat::impl_handle {
template<typename Obj, uint32_t PageSize>
struct Item
{
fm_DECLARE_DELETED_COPY_MOVE_ASSIGNMENTS(Item);
Item();
~Item() noexcept;
union { char empty = {}; Obj object; };
Handle<Obj, PageSize> handle;
uint32_t next;
};
template<typename Obj, uint32_t PageSize>
class Page
{
friend struct Handle<Obj, PageSize>;
std::array<Item<Obj, PageSize>, PageSize> storage;
BitArray used_map; // todo replace with a rewrite of std::bitset
uint32_t start_index;
uint32_t used_count;
uint32_t first_free;
bool locked;
static void do_deallocate(Item<Obj, PageSize>& item);
public:
fm_DECLARE_DELETED_COPY_MOVE_ASSIGNMENTS(Page);
explicit Page(uint32_t start_index);
~Page() noexcept;
template<typename... Xs>
requires requires (Xs&&... xs) {
Obj{forward<Xs>(xs)...};
}
[[nodiscard]] Item<Obj, PageSize>& allocate(Xs&&... xs);
void deallocate(Handle<Obj, PageSize> obj);
void deallocate_all();
bool is_empty();
bool is_full();
uint32_t use_count() const;
};
} // namespace floormat::impl_handle
|
