![\"\"](\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/enable_shared_from_this.png\")
<\/a><\/h1>\n\u4e00\u3001\u6982\u8ff0<\/h1>\n1\u3001\u4ec0\u4e48\u662fenable_shared_from_this?<\/h3>\n
enable_shared_from_this\u662fC++11\u5f00\u59cb\u652f\u6301\u7684\u4e00\u4e2a\u65b0\u7279\u6027\uff0c\u5b83\u662f\u4e00\u4e2a\u6a21\u677f\u7c7b\uff0c\u5b9a\u4e49\u5728\u5934\u6587\u4ef6 <memory>\uff0c\u5176\u539f\u578b\u4e3a\uff1a<\/p>\n
template< class T > class enable_shared_from_this;<\/code><\/pre>\nstd::enable_shared_from_this \u80fd\u8ba9\u5176\u4e00\u4e2a\u5bf9\u8c61\uff08\u5047\u8bbe\u5176\u540d\u4e3a t \uff0c\u4e14\u5df2\u88ab\u4e00\u4e2a std::shared_ptr \u5bf9\u8c61 pt \u7ba1\u7406\uff09\u5b89\u5168\u5730\u751f\u6210\u5176\u4ed6\u989d\u5916\u7684 std::shared_ptr \u5b9e\u4f8b\uff08\u5047\u8bbe\u540d\u4e3a pt1, pt2, \u2026 \uff09\uff0c\u5b83\u4eec\u4e0e pt \u5171\u4eab\u5bf9\u8c61 t \u7684\u6240\u6709\u6743\u3002<\/p>\n
\u4f8b\u5982\uff1a\u82e5\u4e00\u4e2a\u7c7b T \u7ee7\u627f\u81ea std::enable_shared_from_this<T> \uff0c\u5219 T \u7c7b\u4e2d\u6709\u7ee7\u627f\u81ea\u7236\u7c7b\u7684\u6210\u5458\u51fd\u6570\uff1a shared_from_this \u3002 \u5f53 T \u7c7b\u7684\u5bf9\u8c61 t \u88ab\u4e00\u4e2a\u4e3a\u540d\u4e3a pt \u7684 std::shared_ptr \u7c7b\u5bf9\u8c61\u7ba1\u7406\u65f6\uff0c\u8c03\u7528 T::shared_from_this \u6210\u5458\u51fd\u6570\uff0c\u5c06\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684 std::shared_ptr \u5bf9\u8c61\uff0c\u5b83\u4e0e pt \u5171\u4eab t \u7684\u6240\u6709\u6743\u3002<\/p>\n
2\u3001\u4ec0\u4e48\u60c5\u51b5\u4e0b\u9700\u8981\u7528 enable_shared_from_this\uff1f<\/h3>\n
\u5f53\u4e00\u4e2a\u7c7b\u88ab\u5171\u4eab\u667a\u80fd\u6307\u9488 share_ptr \u7ba1\u7406\uff0c\u4e14\u5728\u7c7b\u7684\u6210\u5458\u51fd\u6570\u91cc\u9700\u8981\u628a\u5f53\u524d\u7c7b\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\u4f20\u7ed9\u5176\u4ed6\u51fd\u6570\u65f6\uff08\u4f8b\u5982\u4f20\u9012\u7ed9\u5f02\u6b65\u7ebf\u7a0b\uff09\uff0c\u8fd9\u65f6\u5c31\u9700\u8981\u4f20\u9012\u4e00\u4e2a\u6307\u5411\u81ea\u8eab\u7684 share_ptr\u3002<\/p>\n
\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u8981\u5728\u4e00\u4e2a\u7c7b\u7684\u6210\u5458\u51fd\u6570\u4e2d\uff0c\u5bf9\u5916\u90e8\u8fd4\u56de this \u6307\u9488\u5c31\u6210\u4e86\u4e00\u4e2a\u5f88\u68d8\u624b\u7684\u95ee\u9898\u3002<\/p>\n
3\u3001\u5982\u4f55\u5b89\u5168\u7684\u5c06 this \u6307\u9488\u8fd4\u56de\u7ed9\u8c03\u7528\u8005?<\/h3>\n
\u4e00\u822c\u6765\u8bf4\uff0c\u6211\u4eec\u4e0d\u80fd\u76f4\u63a5\u5c06 this \u6307\u9488\u8fd4\u56de\u3002\u5982\u679c\u51fd\u6570\u5c06 this \u6307\u9488\u8fd4\u56de\u5230\u5916\u90e8\u67d0\u4e2a\u53d8\u91cf\u4fdd\u5b58\uff0c\u7136\u540e\u8fd9\u4e2a\u5bf9\u8c61\u81ea\u8eab\u5df2\u7ecf\u6790\u6784\u4e86\uff0c\u4f46\u5916\u90e8\u53d8\u91cf\u5e76\u4e0d\u77e5\u9053\uff0c\u6b64\u65f6\u5982\u679c\u5916\u90e8\u53d8\u91cf\u518d\u4f7f\u7528\u8fd9\u4e2a\u6307\u9488\uff0c\u5c31\u4f1a\u4f7f\u5f97\u7a0b\u5e8f\u5d29\u6e83\u3002\u4f8b\u5982\u4e0b\u8fb9\u8fd9\u79cd\u573a\u666f\uff1a<\/p>\n
struct Bad\r\n {\r\n void fun()\r\n {\r\n shared_ptr<Bad> sp{ this };\r\n cout << sp->count() << endl;\r\n }\r\n };\r\n shared_ptr<Bad> sp{make_shared<Bad>()};\r\n sp->fun(); \/\/\u8f93\u51fa\u4e3a1<\/code><\/pre>\n\u5728 func \u51fd\u6570\u6784\u9020\u667a\u80fd\u6307\u9488\u65f6\uff0c\u6211\u4eec\u65e0\u6cd5\u786e\u5b9a\u8fd9\u4e2a\u5bf9\u8c61\u662f\u4e0d\u662f\u88ab shared_ptr \u7ba1\u7406\u7740\uff0c\u56e0\u6b64\u8fd9\u6837\u6784\u9020\u7684 shared_ptr \u5e76\u4e0d\u662f\u4e0e\u5176\u4ed6 shared_ptr \u5171\u4eab\u4e00\u4e2a\u8ba1\u6570\u5668\uff0c\u90a3\u4e48\uff0c\u5728\u6790\u6784\u65f6\u5c31\u4f1a\u5bfc\u81f4\u5bf9\u8c61\u88ab\u91cd\u590d\u91ca\u653e\uff0c\u4ece\u800c\u5f15\u53d1\u9519\u8bef\u3002<\/p>\n
\u5728\u4e00\u4e2a\u5bf9\u8c61\u5185\u90e8\u6784\u9020\u8be5\u5bf9\u8c61\u7684 shared_ptr \u65f6\uff0c\u5373\u4f7f\u8be5\u5bf9\u8c61\u5df2\u7ecf\u88ab shared_ptr \u7ba1\u7406\u7740\uff0c\u4e5f\u4e0d\u4f1a\u9020\u6210\u5bf9\u8c61\u88ab\u4e24\u4e2a\u72ec\u7acb\u7684\u667a\u80fd\u6307\u9488\u7ba1\u7406\u3002<\/p>\n
\u8fd9\u5c31\u8981\u6c42\u6211\u4eec\u5728\u5bf9\u8c61\u5185\u6784\u9020\u5bf9\u8c61\u7684\u667a\u80fd\u6307\u9488\u65f6\uff0c\u5fc5\u987b\u80fd\u8bc6\u522b\u6709\u5bf9\u8c61\u662f\u5426\u5df2\u7ecf\u7531\u5176\u4ed6\u667a\u80fd\u6307\u9488\u7ba1\u7406\u3001\u667a\u80fd\u6307\u9488\u7684\u6570\u91cf\uff0c\u5e76\u4e14\u6211\u4eec\u521b\u5efa\u667a\u80fd\u6307\u9488\u540e\u4e5f\u80fd\u8ba9\u4e4b\u524d\u7684\u667a\u80fd\u6307\u9488\u611f\u77e5\u5230\u3002<\/p>\n
\u6b63\u786e\u505a\u6cd5\u662f\u7ee7\u627f enable_shared_from_this \u7c7b\uff0c\u8c03\u7528 shared_from_this() \u51fd\u6570\u751f\u6210 shared_ptr\uff0c\u4f7f\u7528\u5982\u4e0b\uff1a<\/p>\n
struct Good : public std::enable_shared_from_this<Good>\r\n {\r\n \u3000\u3000void fun()\r\n \u3000\u3000{\r\n \u3000\u3000\u3000\u3000shared_ptr<Good> sp{ shared_from_this() };\r\n \u3000\u3000\u3000\u3000cout << sp->count() << endl;\r\n \u3000\u3000}\r\n };\r\n shared_ptr<Good> sp{make_shared<Good>()}; \/\/ *1*\r\n sp->fun(); \/\/\u8f93\u51fa\u4e3a2<\/code><\/pre>\n<\/h1>\n\u4e8c\u3001\u5b9e\u73b0\u539f\u7406<\/h1>\n1\u3001enable_shared_from_this\u7684\u6807\u51c6\u5e93\u5b9e\u73b0<\/h3>\n
gcc\u662f\u901a\u8fc7 weak_ptr \u6765\u5b9e\u73b0\u7684\u3002\u5148\u7528\u8981\u7ba1\u7406\u5bf9\u8c61(obj)\u7684\u6307\u9488\u548c\u5df2\u6709\u7684\u7ba1\u7406obj\u7684shared_ptr(sp1,…,spn) \u7684\u4e2a\u6570(spi->use_count())\u6765\u521d\u59cb\u5316\u4e00\u4e2a weak_ptr<Obj>(&obj , spi->use_count())\uff0c\u7136\u540e\u7528\u8fd9\u4e2a weak_ptr \u6784\u9020\u4e00\u4e2a shared_ptr\u3002<\/p>\n
\/\/ enable_shared_from_this\u7684\u5b9e\u73b0\r\n \/\/ \u57fa\u4e8e(\/usr\/include\/c++\/7.3.0\/bits\/shared_ptr.h)\r\n \/\/ \u6b64\u4ee3\u7801\u662f\u5bf9gcc\u5b9e\u73b0\u7684\u7b80\u5316\u7248\u672c, \u4ec5\u4f5c\u4e3a\u63cf\u8ff0\u539f\u7406\u7528.\r\n template<typename T>\r\n class enable_shared_from_this\r\n {\r\n public:\r\n shared_ptr<T> shared_from_this()\r\n {\r\n return shared_ptr<T>(this->weak_this);\r\n }\r\n shared_ptr<const T> shared_from_this() const\r\n {\r\n return shared_ptr<const T>(this->weak_this);\r\n }\r\n private:\r\n template<typename>\r\n friend class shared_ptr;\r\n \r\n template<typename T1>\r\n void _M_weak_assign(T1* p, const shared_count<>& n)\r\n {\r\n \u3000\u3000weak_this._M_assign(p, n);\r\n }\r\n \r\n mutable weak_ptr<T> weak_this;\r\n };<\/code><\/pre>\nenable_shared_from_this<T> \u7c7b\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a weak_ptr<T>\uff0c\u8d77\u5230\u4e86\u4e0a\u6587\u63d0\u5230\u7684\u4eceobj\u6307\u9488\u751f\u6210 shared_ptr<T> \u5bf9\u8c61\u7684\u4f5c\u7528\u3002\u6309\u7167\u5148\u524d\u7684\u539f\u7406\uff0c\u6211\u4eec\u53ef\u80fd\u8ba4\u4e3a\u662f\u5728obj\u521d\u59cb\u5316\u7684\u65f6\u5019\uff0c\u540c\u65f6\u5bf9 weak_this \u8fdb\u884c\u521d\u59cb\u5316\uff0c\u4f46\u662f\u5728\u8fd9\u6bb5\u4ee3\u7801\u91cc\u663e\u7136\u6ca1\u6709\u5bf9 weak_this \u8fdb\u884c\u4efb\u4f55\u521d\u59cb\u5316\u5de5\u4f5c\uff08\u539f\u59cb\u4ee3\u7801\u91cc\u4e5f\u6ca1\u6709\uff0cgcc\u4e3a\u4ec0\u4e48\u4e0d\u8fd9\u6837\u5b9e\u73b0\u5462\uff1f\u8fd9\u662f\u56e0\u4e3a\u5f53\u5bf9\u8c61\u6ca1\u6709\u7531\u667a\u80fd\u6307\u9488\u7ba1\u7406\u65f6\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u662f\u6ca1\u6709\u5fc5\u8981\u7684\u3002 \u6240\u4ee5\u5e94\u8be5\u628a\u8fd9\u4e2a\u4efb\u52a1\u4ea4\u7ed9 shared_ptr\uff09\u3002<\/p>\n
gcc\u5728 shared_ptr<T> \u7684\u6784\u9020\u51fd\u6570\u4e2d\u5bf9 weak_ptr<T> \u8fdb\u884c\u5904\u7406\u3002\u4ece Good \u7c7b\u6765\u770b\uff0c\u5c31\u662f\u5728 *1* \u5904\u5bf9 Good \u5bf9\u8c61\u4e2d\u7684 weak_ptr<Good> weak_this \u8fdb\u884c\u5904\u7406\uff0c\u4f7f\u5176\u6307\u5411\u4e00\u4e2a\u6709\u6548\u7684 Good \u5bf9\u8c61\uff0c\u5e76\u4fee\u6539 use_count\u3002\u4e0a\u9762 Good \u7c7b\u5bf9 enable_shared_from_this \u7684\u4f7f\u7528\u662f\u5c11\u6570\u51e0\u79cd\u6709\u6548\u7684\u65b9\u6cd5\uff0c\u5fc5\u987b\u4fdd\u8bc1\uff0c\u5982\u679c\u5bf9\u4e00\u4e2a\u5bf9\u8c61\u8c03\u7528 shared_from_this()\uff0c\u8be5\u5bf9\u8c61\u5fc5\u987b\u662f\u7531 shared_ptr<T> \u6301\u6709\u7684\u3002\u4ece\u4e0a\u4e00\u6bb5\u7684\u539f\u7406\u4e2d\u53ef\u4ee5\u7406\u89e3\u8fd9\u6837\u505a\u7684\u539f\u56e0\uff1a\u7b2c\u4e00\u4e2a\u6301\u6709 Good \u5bf9\u8c61 obj \u7684 shared_ptr<T> sp1 \u4f1a\u5bf9 obj \u7684 weak_this \u8fdb\u884c\u5904\u7406\uff0c\u4ee5\u4f7f\u5176\u6709\u6548\u3002<\/p>\n
2\u3001shared_ptr \u6784\u9020\u51fd\u6570\u4e2d\u7684\u7279\u6b8a\u5904\u7406<\/h3>\n
\u5728 shared_ptr \u4e2d\u5b9a\u4e49\u4e86\u8fd9\u6837\u4e00\u4e2a\u51fd\u6570\uff08\u6765\u81ea\/usr\/include\/c++\/7.3.0\/bits\/shared_ptr_base.h\u4e2d\u7c7b__shared_ptr\uff09\uff1a<\/p>\n
template<typename _Yp, typename _Yp2 = typename remove_cv<_Yp>::type>\r\n typename enable_if<__has_esft_base<_Yp2>::value>::type\r\n _M_enable_shared_from_this_with(_Yp* __p) noexcept\r\n {\r\n if(auto __base = __enable_shared_from_this_base(_M_refcount, __p))\r\n __base->_M_weak_assign(const_cast<_Yp2*>(__p), _M_refcount);\r\n }\r\n \r\n template<typename _Yp, typename _Yp2 = typename remove_cv<_Yp>::type>\r\n typename enable_if<!__has_esft_base<_Yp2>::value>::type\r\n _M_enable_shared_from_this_with(_Yp*) noexcept { }<\/code><\/pre>\n\u5176\u4e2d _Yp \u662f shared_ptr \u7ba1\u7406\u7684\u5bf9\u8c61\u7684\u7c7b\u578b\u3002<\/p>\n
\u8fd9\u4e24\u4e2a\u6a21\u677f\u51fd\u6570\u8868\u793a\uff1a\u5f53 _Yp \u662f enable_shared_from_this \u7684\u5b50\u7c7b\u65f6\uff0c\u5c31\u4f1a\u751f\u6210\u7b2c\u4e00\u4e2a\u51fd\u6570\uff0c\u5176\u529f\u80fd\u662f\u901a\u8fc7 _Yp \u5bf9\u8c61\u7684\u6307\u9488\u6765\u8c03\u7528\u5176 _M_weak_assign \u51fd\u6570\u4ee5\u4fee\u6539 _Yp \u5bf9\u8c61\u7684 weak_this \u6210\u5458\uff0c\u800c\u5b9e\u9645\u4e0a _M_weak_assign \u8c03\u7528\u7684\u662f weak_this._M_assign \u51fd\u6570\u3002<\/p>\n
\/\/ from shared_ptr_base.h class __weak_ptr, derived by weak_ptr\r\n void _M_assign(_Tp* __ptr, const __shared_count<_Lp>& __refcount) noexcept\r\n {\r\n if (use_count() == 0)\r\n {\r\n _M_ptr = __ptr;\r\n _M_refcount = __refcount;\r\n }\r\n }<\/code><\/pre>\n\u4e09\u3001\u5b9e\u4f8b<\/h1>\n
\u4e0b\u8fb9\u7528\u5b9e\u9645\u7684\u4f8b\u5b50\u6765\u8bf4\u660e\u4e0b\u5982\u4f55\u5b89\u5168\u7684\u5411\u5916\u4f20\u9012\u7c7b\u5bf9\u8c61 this \u6307\u9488\uff1a<\/p>\n
#include <iostream>\r\n#include <stdlib.h>\r\n#include <memory>\r\nusing namespace std;\r\n\r\n\/\/ \u63a8\u8350\u5199\u6cd5\r\nstruct Good : std::enable_shared_from_this<Good>\r\n{\r\n std::shared_ptr<Good> getptr() {\r\n return shared_from_this();\r\n }\r\n};\r\n\r\n\/\/ \u9519\u8bef\u7528\u6cd5\uff1a\u7528\u4e0d\u5b89\u5168\u7684\u8868\u8fbe\u5f0f\u8bd5\u56fe\u83b7\u5f97 this \u7684 shared_ptr \u5bf9\u8c61\r\nstruct Bad\r\n{\r\n std::shared_ptr<Bad> getptr() {\r\n return std::shared_ptr<Bad>(this);\r\n }\r\n ~Bad() { std::cout << \"Bad::~Bad() called\\n\"; }\r\n};\r\n \r\n\r\nint main()\r\n{\r\n \/\/ 1.\u6b63\u786e\u7528\u6cd5: \u4e24\u4e2a shared_ptr \u5171\u4eab\u540c\u4e00\u4e2a\u5bf9\u8c61\r\n std::shared_ptr<Good> gp1 = std::make_shared<Good>();\r\n std::shared_ptr<Good> gp2 = gp1->getptr();\r\n std::cout << \"gp2.use_count() = \" << gp2.use_count() << std::endl; \/\/ 2\r\n \r\n \/\/ 2.\u9519\u8bef\u7528\u6cd5: \u8c03\u7528 shared_from_this\uff0c \u4f46\u5176\u6ca1\u6709\u88ab std::shared_ptr \u5360\u6709 \r\n try {\r\n Good not_so_good;\r\n std::shared_ptr<Good> gp1 = not_so_good.getptr();\r\n } catch(std::bad_weak_ptr& e) { \/\/ \u5728 C++17 \u4e4b\u524d\uff0c\u7f16\u8bd1\u5668\u4e0d\u80fd\u6355\u83b7 enable_shared_from_this \u629b\u51fa\u7684std::bad_weak_ptr \u5f02\u5e38\r\n std::cout << e.what() << std::endl; \r\n }\r\n \r\n \/\/ 3.\u9519\u8bef\u7528\u6cd5\uff0c\u6bcf\u4e2a shared_ptr \u90fd\u8ba4\u4e3a\u81ea\u5df1\u662f\u5bf9\u8c61\u7684\u552f\u4e00\u62e5\u6709\u8005\r\n \/\/ \u8c03\u7528\u9519\u8bef\u7684\u7528\u6cd5\uff0c\u4f1a\u5bfc\u81f4\u4e24\u6b21\u6790\u6784Bad\u7684\u5bf9\u8c61\uff0c\u7b2c\u4e8c\u6b21\u6790\u6784\u65f6\uff0c\u6307\u9488\u6307\u5411\u7684\u7a7a\u95f4\u5df2\u7ecf\u88ab\u6790\u6784\uff0c\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u51fa\u9519\r\n std::shared_ptr<Bad> bp1 = std::make_shared<Bad>();\r\n std::shared_ptr<Bad> bp2 = bp1->getptr();\r\n std::cout << \"bp1.use_count() = \" << bp1.use_count() << std::endl; \/\/ 1\r\n std::cout << \"bp2.use_count() = \" << bp2.use_count() << std::endl; \/\/ 1\r\n\r\n return 0;\r\n}\r\n\r\n# \u63a7\u5236\u53f0\u8f93\u51fa\r\ngp2.use_count() = 2\r\nbad_weak_ptr\r\nbp1.use_count() = 1\r\nbp2.use_count() = 1\r\nBad::~Bad() called\r\n\r\nERROR: AddressSanitizer: attempting free on address which was not malloc()-ed: 0x60300002ab30 in thread T0\r\nAddressSanitizer: bad-free\r\n<\/code><\/pre>\n\u56db\u3001\u603b\u7ed3<\/h1>\n
enable_shared_from_this \u7684\u5e38\u89c1\u5b9e\u73b0\u4e3a\uff1a\u5176\u5185\u90e8\u4fdd\u5b58\u7740\u4e00\u4e2a\u5bf9 this \u7684\u5f31\u5f15\u7528\uff08\u4f8b\u5982 std::weak_ptr )\u3002 std::shared_ptr \u7684\u6784\u9020\u51fd\u6570\u68c0\u6d4b\u65e0\u6b67\u4e49\u4e14\u53ef\u8bbf\u95ee\u7684enable_shared_from_this \u57fa\u7c7b\uff0c\u5e76\u4e14\u82e5\u5185\u90e8\u5b58\u50a8\u7684\u5f31\u5f15\u7528\u6ca1\u6709\u88ab\u5df2\u5b58\u5728\u7684 std::shared_ptr \u5360\u6709\uff0c\u5219\u8d4b\u503c\u65b0\u5efa\u7684 std::shared_ptr \u4e3a\u5185\u90e8\u5b58\u50a8\u7684\u5f31\u5f15\u7528\u3002\u4e3a\u53e6\u4e00\u4e2a std::shared_ptr \u6240\u7ba1\u7406\u7684\u5bf9\u8c61\u6784\u9020\u4e00\u4e2a std::shared_ptr \uff0c\u5c06\u4e0d\u4f1a\u8003\u8651\u5185\u90e8\u5b58\u50a8\u7684\u5f31\u5f15\u7528\uff0c\u4ece\u800c\u5c06\u5bfc\u81f4\u672a\u5b9a\u4e49\u884c\u4e3a(undefined behavior)\u3002<\/p>\n
\u53ea\u5141\u8bb8\u5728\u5df2\u88abstd::shared_ptr \u7ba1\u7406\u7684\u5bf9\u8c61\u4e0a\u8c03\u7528 shared_from_this \u3002\u5426\u5219\u8c03\u7528\u884c\u4e3a\u629b\u51fa std::bad_weak_ptr \u5f02\u5e38\uff08\u901a\u8fc7 shared_ptr\u9ed8\u8ba4\u6784\u9020\u7684 weak_this \u7684\u6784\u9020\u51fd\u6570\uff09\u3002<\/p>\n
enable_shared_from_this \u63d0\u4f9b\u4e86\u66f4\u5b89\u5168\u7684\u65b9\u6848\uff0c\u4ee5\u66ff\u4ee3 std::shared_ptr(this) \u8fd9\u6837\u7684\u8868\u8fbe\u5f0f\uff08\u8fd9\u79cd\u4e0d\u5b89\u5168\u7684\u8868\u8fbe\u5f0f\u53ef\u80fd\u4f1a\u5bfc\u81f4 this \u88ab\u591a\u4e2a\u4e92\u4e0d\u77e5\u6653\u7684\u6240\u6709\u8005\u6790\u6784\uff09\u3002\u5f53\u6d89\u53ca\u9700\u8981\u5728\u7c7b\u7684\u6210\u5458\u51fd\u6570\u91cc\u628a\u5f53\u524d\u7c7b\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\u4f20\u7ed9\u5916\u90e8\u65f6\uff0c\u5efa\u8bae\u5176\u57fa\u7c7b\u7ee7\u627fstd::enable_shared_from_this<T>\uff0c\u5e76\u4f7f\u7528shared_from_this()\uff0c\u4ee5\u964d\u4f4e\u5b89\u5168\u98ce\u9669\u3002<\/p>\n
<\/p>\n
yan 23.3.22 23.58<\/p>\n
\u53c2\u8003\uff1a<\/p>\n
std::enable_shared_from_this<\/a><\/p>\nenable_shared_from_this\u7c7b\u7684\u4f5c\u7528\u548c\u5b9e\u73b0<\/a><\/p>\n