{shared_ptr<test>get_ptr(){returnshared_from_this(); } };intmain(){ test a; a.get_ptr();return0; } 会throw std::bad_weak_ptr,因为weak_this_没有被shared_ptr初始化 3.weak_ptr http://c.biancheng.net/view/7918.html 持有一个对shared_ptr指向资源的弱引用,就是用来解决循环引用导致的...
AI代码解释 #include<stdio.h>#include<pthread.h>volatile int sharedValue=0;void*threadFunction(void*arg){sharedValue=10;returnNULL;}intmain(){pthread_t thread;pthread_create(&thread,NULL,threadFunction,NULL);while(sharedValue!=10){// 等待线程修改sharedValue}printf("sharedValue has been modified...
const T &v2, F f = F()){if (f(v1, v2)) return -1; if (f(v2, v1)) return 1; return 0;}Template Default Arguments and Class Templates当一个 class template 的所有模板参数都带默认值时，我们定义类时，需要带一
It is only needed * if you intend to use BuildTupleFromCStrings() to create the return * tuple. */ AttInMetadata *attinmeta; /* * memory context used for structures that must live for multiple calls * * multi_call_memory_ctx is set by SRF_FIRSTCALL_INIT() for you, and used * ...
return:返回到调用处pthread_exit() :退出当前线程int pthread_join(pthread_t thread, void **value_ptr);(与wait函数的功能一样)#include<stdio.h> #include<stdlib.h> #include<string.h> #include<unistd.h> #include<errno.h> #include<pthread.h> struct thrd { int var; char str[256]; }; ...
理由: std::shared_ptr 中重载了bool运算符 explicit operator bool() const _NOEXCEPT { // test if shared_ptr object owns no resource return (this->_Get() != 0); } std::shared_ptr 的创建 class TestClass { public: TestClass()
error C2440: 'return' : cannot convert from '__missing_type__*' to '__missing_type__' error C2440: 'static_cast' : cannot convert from 'void... Error C2447: '{': missing function header (old-style formal list?). error C2471: cannot update program database error C2664: 'int sw...
(host_dets)<<std::endl;for(inti=0;i<sizeof(dets)/sizeof(float);i++){std::cout<<host_dets[i]<<" ";}std::cout<<std::endl;cudaFree(dev_dets);std::cout<<"done.\n";return0;}// 输出为96CopieddatatoGPU.Copiedfromcudabacktohost.host_detssize:962334567611234545122247479455665203755750000...
我们可以说它应该是一个空的 (null) std::shared_ptr<LinearImpl>。但是,请记住 Linear(3, 4) 与 std::make_shared<LinearImpl>(3, 4) 相同。这意味着如果我们决定Linear linear;应该是一个空指针,那么就无法构造一个不接受任何构造函数参数或默认所有参数的模块。出于这个原因,在当前的 API 中,默认构造的...
threads.emplace_back(function); } for (auto& thread : threads) { thread.join(); } } int main() { functional_test(); return 0; } 上述代码中的goog_write函数会打开一个文件并写入一些字符串而bad_close函数中也会打开一个文件同时包含double-close问题,这两个线程同时运行那么程序的执行情况会是这...