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
|
discard """
output: '''5.0 10.0
=destroy
=destroy
'''
"""
type
MyOpt[T] = object
case has: bool:
of true: val: T
of false: nil
MyVal = object
f: ptr float
proc `=destroy`(x: var MyVal) =
if x.f != nil:
dealloc(x.f)
proc `=sink`(x1: var MyVal, x2: Myval) =
if x1.f != x2.f:
`=destroy`(x1)
x1.f = x2.f
proc `=`(x1: var MyVal, x2: Myval) =
if x1.f != x2.f:
`=destroy`(x1)
x1.f = create(float)
x1.f[] = x2.f[]
proc newVal(x: float): MyVal =
result.f = create(float)
result.f[] = x
template getIt[T, R](self: MyOpt[T], body: untyped, default: R): R =
if self.has:
template it: untyped {.inject.} = self.val
body
else:
default
proc myproc(h: MyOpt[float]) =
let (a, b) = h.getIt((newVal(it), newVal(it * 2)), (newVal(1.0), newVal(1.0)))
echo a.f[], " ", b.f[]
let h = MyOpt[float](has: true, val: 5.0)
myproc(h)
#-------------------------------------------------------------
type
MyObject* = object
len*: int
amount: UncheckedArray[float]
MyObjPtr* = ptr MyObject
MyObjContainer* {.byref.} = object
size1: int
size2: int
data: ptr UncheckedArray[MyObjPtr]
proc size1*(m: MyObjContainer): int {.inline.} = m.size1
proc size2*(m: MyObjContainer): int {.inline.} = m.size2
proc allocateMyObjPtr(size2: int): MyObjPtr =
cast[MyObjPtr](allocShared(sizeof(MyObject) + sizeof(float) * size2.int))
proc `=destroy`*(m: var MyObjContainer) {.inline.} =
if m.data != nil:
for i in 0..<m.size1:
if m.data[i] != nil:
deallocShared(m.data[i])
m.data[i] = nil
deallocShared(m.data)
echo "=destroy"
m.data = nil
proc `=sink`*(m: var MyObjContainer, m2: MyObjContainer) {.inline.} =
if m.data != m2.data:
`=destroy`(m)
m.size1 = m2.size1
m.size2 = m2.size2
m.data = m2.data
proc `=`*(m: var MyObjContainer, m2: MyObjContainer) {.error.}
## non copyable
func newMyObjContainer*(size2: Natural): MyObjContainer =
result.size2 = size2
proc push(m: var MyObjContainer, cf: MyObjPtr) =
## Add MyObjPtr to MyObjContainer, shallow copy
m.size1.inc
m.data = cast[ptr UncheckedArray[MyObjPtr]](reallocShared(m.data, m.size1 * sizeof(MyObjPtr)))
m.data[m.size1 - 1] = cf
proc add*(m: var MyObjContainer, amount: float) =
assert m.size2 > 0, "MyObjContainer is not initialized, use newMyObjContainer() to initialize object before use"
let cf = allocateMyObjPtr(m.size2)
for i in 0..<m.size2:
cf.amount[i.int] = amount
m.push(cf)
proc add*(dest: var MyObjContainer, src: sink MyObjContainer) =
# merge containers
for i in 0..<src.size1:
dest.push src.data[i]
src.data[i] = nil
proc test =
var cf1 = newMyObjContainer(100)
cf1.add(1)
cf1.add(2)
var cf3 = newMyObjContainer(100)
cf3.add(2)
cf3.add(3)
cf1.add(cf3)
test()
|