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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
0CKFDUJWF$Λͬͯ
.3$Ͱշదʹ։ൃ͢Δ
:VLJ:BTPTIJNB
!ZBTP@TBO
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
0CKFDUJWF$ͷϝϞϦཧ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
"VUPNBUJD3FGFSFODF$PVOUJOH
"3$
ࢀরΧϯλํࣜͷϝϞϦཧΛ
ίϯύΠϥ͕ࣗಈͰߦͬͯ͘ΕΔ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
"3$ͷઃఆ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
.BOVBM3FGFSFODF$PVOUJOH
.3$
ࢀরΧϯλํࣜͷϝϞϦཧΛ
खಈͰߦ͏
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
.3$ͰͷϝϞϦཧ
TestClass *value = [[TestClass alloc] init];
// ࢀরΧϯτ 1
[value release];
// ࢀরΧϯτ 0
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
.3$ͰͷϝϞϦཧ
NSNumber *value = [[NSNumber alloc] initWithInt:1];
[value retain]; // ࢀরΧϯτ 2
[value release]; // ࢀরΧϯτ 1
[value release]; // ࢀরΧϯτ 0
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
.3$ͰͷϝϞϦཧ
@autoreleasepool {
NSNumber *value = [[NSNumber alloc] initWithInt:1];
[value autorelease]; // ࢀরΧϯτ = 1 (- 1)
...
} // ࢀরΧϯτ = 0
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
"3$ͷ߹ͷΫϥε࣮
@implementation Sample {
NSNumber *_value;
}
- (void)setValue:(NSNumber *)value {
_value = value;
}
- (NSNumber *)value {
return _value;
}
@end
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
.3$ͷ߹ͷΫϥε࣮
@implementation Sample {
NSNumber *_value;
}
- (void)setValue:(NSNumber *)value {
[value retain];
[_value release];
_value = value;
}
- (NSNumber *)value {
return [[_value retain] autorelease];
}
- (void)dealloc
{
[_value release];
[super dealloc];
}
@end
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
0CKFDUJWF$
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
֦ுࢠΛNNʹ͢Δ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ࣅͨػೳͷݺͼํͷҧ͍
0CKFDUJWF$ 4XJGU
$
Πϯελϯεมɾϝιου ϝϯόมɾؔ
ΠχγϟϥΠβ ίϯετϥΫλ
δΣωϦΫε ςϯϓϨʔτ
ϒϩοΫɾΫϩʔδϟ ϥϜμࣜ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
0CKFDUJWF$
#import
#import
#import
void Sample() {
NSString *objcText = @"Obj-C Text";
NSLog(@"%@", objcText);
std::string cppText = "C++ Text";
std::cout << cppText << std::endl;
}
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
0CKFDUJWF$
@implementation ObjcClass {
std::string _text;
}
- (void)setText:(std::string const &)text {
_text = text;
}
- (std::string const &)text {
return _text;
}
@end
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
0CKFDUJWF$
class CppClass {
NSString *_text;
public:
void setText(NSString *text) {
_text = text;
}
NSString *text() {
return _text;
}
};
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
$ͷϝϞϦཧ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
$ΦϒδΣΫτͷΠϯελϯεԽ
CppClass *pointer = new CppClass();
delete pointer;
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
$ΦϒδΣΫτͷΠϯελϯεԽ
CppClass value_1;
CppClass value_2(2);
CppClass value_3{3};
CppClass value_4 = CppClass(4);
auto value_5 = CppClass(5);
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ղ์͞ΕΔλΠϛϯάʢؔʣ
void SampleFunc() {
CppClass value;
} // <- valueؔͷείʔϓΛൈ͚Δ࣌ʹղ์͞ΕΔ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ղ์͞ΕΔλΠϛϯάʢؔʣ
void SampleFunc() {
if (true) {
CppClass value;
} // <- valueJGͷείʔϓΛൈ͚Δ࣌ʹղ์͞ΕΔ
}
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ղ์͞ΕΔλΠϛϯάʢ$Ϋϥεʣ
class CppParentClass {
public:
CppClass value;
~CppParentClass() {
} // <- σετϥΫλ͕ݺΕͨޙʹϝϯόมvalue͕ղ์͞ΕΔ
};
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ղ์͞ΕΔλΠϛϯάʢ0CK$Ϋϥεʣ
@implementation ObjcParent {
CppClass value;
}
- (void)dealloc {
[super dealloc];// <- deallocͷதͰΠϯελϯεม͕ղ์͞ΕΔ
}
@end
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
0CKFDUJWF$ͷΦϒδΣΫτΛ
อ࣋͢Δ$ͷΫϥεΛ࡞Δ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
0CKFDUJWF$ͷΦϒδΣΫτΛ
อ࣋͢Δ$ͷΫϥεΛ࡞ͬͨ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
PCKD@QUSIQQ
//
// objc_ptr.hpp
//
#pragma once
#include
#include
template
class objc_impl {
public:
T const value;
objc_impl(T value) : value(value) {
[value retain];
}
~objc_impl() {
[value release];
}
};
template
class weak_objc_ptr;
template
objc_ptr make_objc_ptr(T value) {
objc_ptr ptr(value);
[value release];
return ptr;
}
template
class weak_objc_ptr {
std::weak_ptr> _impl;
public:
weak_objc_ptr() = default;
weak_objc_ptr(objc_ptr ptr) : _impl(ptr._impl) {
}
objc_ptr lock() const {
if (auto locked = _impl.lock()) {
return objc_ptr(locked);
} else {
return objc_ptr();
}
}
};
template
weak_objc_ptr to_weak(objc_ptr ptr) {
return weak_objc_ptr(ptr);
}
template
class objc_ptr {
friend class weak_objc_ptr;
std::shared_ptr> _impl;
objc_ptr(std::shared_ptr> holder) : _impl(holder) {
}
public:
objc_ptr() : objc_ptr(nil) {
}
objc_ptr(T value) : _impl(std::make_shared>(value)) {
}
objc_ptr(std::function handler) {
@autoreleasepool {
_impl = std::make_shared>(handler());
}
}
T value() const {
return _impl->value;
}
T operator*() const {
return _impl->value;
}
explicit operator bool() const {
return _impl->value != nil;
}
};
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
PCKD@QUS5
TIBSFE@QUSPCKD@JNQM5
PCKD@QUSΫϥεͷߏ
PCKD@JNQM5
˞50CKFDUJWF$ͷΫϥεͷܕʢʮ/44USJOHʯͳͲʣ
5WBMVFʢSFUBJOͯ͠อ࣋ʣ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
PCKD@QUSͷ༻ྫ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
SFUBJOͯ͠อ࣋͢Δ
TestClass *testObj = [[[TestClass alloc] init] autorelease];
objc_ptr test_ptr(testObj);
NSLog(@"value : %@", test_ptr.value());
NSLog(@"value : %@", *test_ptr);
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ࢀরΧϯτͦͷ··อ࣋͢Δ
auto test_ptr = make_objc_ptr([[TestClass alloc] init]);
NSLog(@“value : %@", *test_ptr);
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
BVUPSFMFBTFΛ֎ͯ͠อ࣋͢Δ
objc_ptr test_ptr(
[]() {
return [[[TestClass alloc] init] autorelease];
}
);
NSLog(@"value : %@", *test_ptr);
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ऑࢀরͰอ࣋͢Δ
auto test_ptr = make_objc_ptr([[TestClass alloc] init]);
weak_objc_ptr weak_ptr = test_ptr;
if (auto locked_ptr = weak_ptr.lock()) {
NSLog(@"value : %@", *locked_ptr);
}
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ऑࢀরΛฦؔ͢
auto test_ptr = make_objc_ptr([[TestClass alloc] init]);
auto weak_ptr = to_weak(test_ptr);
auto handler = [weak_ptr]() {
auto locked_ptr = weak_ptr.lock();
NSLog(@"locked value : %@", locked_ptr.value());
};
handler();
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ΠϯελϯεมͰ͏
@implementation Sample {
objc_ptr _value;
}
- (void)setValue:(NSNumber *)value {
_value = value;
}
- (NSNumber *)value {
return *_value;
}
@end
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
ͭͷ0CKFDUJWF$ΦϒδΣΫτΛ
ෳͷPCKD@QUSʹ࣋ͨͤͳ͍ํ͕ྑ͍
ʢಛʹXFBLΛ͏߹ʣ
༻্ͷҙ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
PCKD@QUSಉ࢜ΛൺֱͰ͖ΔΑ͏ʹ͢ΔɺͳͲ
"3$ͱ.3$ΛPCKD@QUSͰٵऩ͢Δ
͞Βʹൃలͤ͞Δ
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IUUQTHJUIVCDPNPCKFDUJWFBVEJPPCKD@QUS@TBNQMF
͓ΘΓ