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
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
#pragma once
#include "borrowed-ptr.hpp"
#include "compat/assert.hpp"
#include <utility>
#define FM_BPTR_DEBUG
#ifdef __CLION_IDE__
#define fm_bptr_assert(...) (void(__VA_ARGS__))
#elif defined FM_BPTR_DEBUG && !defined FM_NO_DEBUG
#define fm_bptr_assert(...) fm_assert(__VA_ARGS__)
#else
#define fm_bptr_assert(...) void()
#endif
#ifdef __GNUG__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
namespace floormat::detail_borrowed_ptr {
#ifdef __GNUG__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wnon-virtual-dtor"
#endif
struct control_block
{
void* _ptr; // todo maybe add directly embeddable objects?
uint32_t _count;
virtual void free_ptr() noexcept = 0;
static void decrement(control_block*& blk) noexcept;
};
#ifdef __GNUG__
#pragma GCC diagnostic pop
#endif
template<typename T>
struct control_block_impl final: control_block
{
void free_ptr() noexcept override;
[[nodiscard]] static control_block* create(T* ptr) noexcept;
protected:
explicit control_block_impl(T* ptr) noexcept;
};
template <typename T>
control_block_impl<T>::control_block_impl(T* ptr) noexcept
{
fm_bptr_assert(ptr);
_ptr = ptr;
_count = 1;
}
template <typename T>
void control_block_impl<T>::free_ptr() noexcept
{
delete static_cast<T*>(_ptr);
}
template <typename T>
control_block* control_block_impl<T>::create(T* ptr) noexcept
{
if (ptr)
{
auto* __restrict ret = new control_block_impl<T>{ptr};
return ret;
}
else
return nullptr;
}
} // namespace floormat::detail_borrowed_ptr
namespace floormat {
template<typename T> bptr<T>::bptr(DirectInitT, T* casted_ptr, detail_borrowed_ptr::control_block* blk) noexcept:
casted_ptr{casted_ptr}, blk{blk}
{}
template<typename T>
template<typename... Ts>
requires std::is_constructible_v<T, Ts&&...>
bptr<T>::bptr(InPlaceInitT, Ts&&... args) noexcept:
bptr{ new T{ forward<Ts...>(args...) } }
{
}
template<typename T> bptr<T>::bptr(std::nullptr_t) noexcept: casted_ptr{nullptr}, blk{nullptr} {}
template<typename T> bptr<T>::bptr() noexcept: bptr{nullptr} {}
template<typename T>
bptr<T>::bptr(T* ptr) noexcept:
casted_ptr{ptr},
blk{detail_borrowed_ptr::control_block_impl<T>::create(ptr)}
{
fm_bptr_assert(!blk || blk->_count == 1 && blk->_ptr);
}
template<typename T>
bptr<T>::~bptr() noexcept
{
if (blk)
blk->decrement(blk);
}
template<typename T> bptr<T>::bptr(const bptr& other) noexcept: bptr{other, private_tag} {}
template<typename T> bptr<T>& bptr<T>::operator=(const bptr& other) noexcept { return _copy_assign(other); }
template<typename T>
template<detail_borrowed_ptr::DerivedFrom<T> Y>
bptr<T>::bptr(const bptr<Y>& other) noexcept: bptr{other, private_tag} {}
template<typename T>
template<detail_borrowed_ptr::DerivedFrom<T> Y>
bptr<T>& bptr<T>::operator=(const bptr<Y>& other) noexcept
{ return _copy_assign(other); }
template<typename T> bptr<T>& bptr<T>::operator=(bptr&& other) noexcept { return _move_assign(move(other)); }
template<typename T> bptr<T>::bptr(bptr&& other) noexcept: bptr{move(other), private_tag} {}
template<typename T>
template<detail_borrowed_ptr::DerivedFrom<T> Y>
bptr<T>::bptr(bptr<Y>&& other) noexcept: bptr{move(other), private_tag} {}
template<typename T>
template<detail_borrowed_ptr::DerivedFrom<T> Y>
bptr<T>& bptr<T>::operator=(bptr<Y>&& other) noexcept
{ return _move_assign(move(other)); }
template<typename T>
void bptr<T>::reset() noexcept
{
if (blk)
{
fm_bptr_assert(casted_ptr);
blk->decrement(blk);
casted_ptr = nullptr;
blk = nullptr;
}
}
template<typename T>
template<bool MaybeEmpty>
void bptr<T>::destroy() noexcept
{
if constexpr(MaybeEmpty)
if (!blk)
return;
blk->free_ptr();
blk->_ptr = nullptr;
casted_ptr = nullptr;
}
template<typename T> bptr<T>& bptr<T>::operator=(std::nullptr_t) noexcept { reset(); return *this; }
template<typename T>
template<typename Y>
bptr<T>::bptr(const bptr<Y>& other, private_tag_t) noexcept:
casted_ptr{other.casted_ptr}, blk{other.blk}
{
if (blk)
{
++blk->_count;
fm_bptr_assert(blk->_count > 1);
}
}
template<typename T>
template<typename Y>
bptr<T>& bptr<T>::_copy_assign(const bptr<Y>& other) noexcept
{
if (blk != other.blk)
{
CORRADE_ASSUME(this != &other); // todo! see if helps
if (blk)
blk->decrement(blk);
casted_ptr = other.casted_ptr;
blk = other.blk;
if (blk)
++blk->_count;
}
return *this;
}
template<typename T>
template<typename Y>
bptr<T>::bptr(bptr<Y>&& other, private_tag_t) noexcept:
casted_ptr{other.casted_ptr}, blk{other.blk}
{
other.casted_ptr = nullptr;
other.blk = nullptr;
}
template<typename T>
template<typename Y>
bptr<T>& bptr<T>::_move_assign(bptr<Y>&& other) noexcept
{
if (blk)
blk->decrement(blk);
casted_ptr = other.casted_ptr;
blk = other.blk;
other.casted_ptr = nullptr;
other.blk = nullptr;
return *this;
}
template<typename T> T* bptr<T>::get() const noexcept
{
if (blk && blk->_ptr) [[likely]]
{
fm_bptr_assert(casted_ptr);
return casted_ptr;
}
else
return nullptr;
}
template<typename T> T* bptr<T>::operator->() const noexcept
{
auto* ret = get();
fm_bptr_assert(ret);
return ret;
}
template<typename T> T& bptr<T>::operator*() const noexcept { return *operator->(); }
template<typename T> bool operator==(const bptr<T>& a, const bptr<T>& b) noexcept { return a.get() == b.get(); }
template<typename T> bptr<T>::operator bool() const noexcept { return get(); }
template<typename T>
void bptr<T>::swap(bptr& other) noexcept
{
using floormat::swap;
swap(casted_ptr, other.casted_ptr);
swap(blk, other.blk);
}
template<typename T> uint32_t bptr<T>::use_count() const noexcept
{
if (blk && blk->_ptr) [[likely]]
return blk->_count;
else
return 0;
}
} // namespace floormat
#ifdef __GNUG__
#pragma GCC diagnostic pop
#endif
|
