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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()
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