在这一章中,我们将重新聚焦于 C++ 中显式使用delete this的行为,特别是它如何触发对象的析构过程以及这一行为的适当用法和潜在风险。正确理解和使用delete this需要对 C++ 的内存管理和对象生命周期有深刻的了解。 3.1 显式删除对象的含义与后果 在C++ 中,使用delete this语句意味着要求程序自行销毁当前对象,并释放它占用的内存
delete this 合法吗? Is it legal (and moral) for a member function to say delete this? 答案:t.cn/E4Wfcfl 合法,但: 必须保证 this 对象是通过 new(不是 new[]、不是 placement new、不是栈上、不是全局、不是其他对象成员)分配的 必须保证调用 delete this 的成员函数是最后一个调用 this 的成员...
/*返回this进行自引用*/#include<iostream>usingnamespacestd;classCounter {public: Counter(intcount =0):m_count(count){}voidprint(void) { cout<< m_count <<endl; } Counter& add(void) {++m_count;return*this; }voiddestory(void) { cout<<"该类已经删除"<<endl;deletethis; }private:intm_c...
move_only(constmove_only&) =delete; move_only(move_only&& other): data(std::move(other.data)) {} move_only&operator=(constmove_only&) =delete; move_only&operator=(move_only&& other) { data=std::move(other.data); return*this; } }; move_only m1; move_onlym2(m1);// 错误,拷贝...
// C4273.cpp// compile with: /W1 /cchar__declspec(dllimport) c;charc;// C4273, delete this line or the line above to resolve 下面的示例生成 C4273。 若要修复此问题,请删除printf_s的重新声明。 C++ // C4273_b.cpp// compile with: /W1 /clr /c#include<stdio.h>extern"C"intprintf_...
delete c1; returnresult; } /*** *... *Note that f8() is documented to returnavalue *which needs to be returned to heap; as f7 thinly *wraps f8, any code which invokes f7() must be *careful to free()thereturn value. * ***...
A(int) =delete; };structB{A a1; A a2 = A(3);// C2280, calls deleted A::A(int)// To fix, remove the call to A(int)};voidf(){ B b;// calls implicit B::B(void)} 示例:未初始化的数据成员 未初始化的引用类型数据成员或const数据成员会导致编译器隐式声明deleted默认构造函数。
3. 通常情况你无需自定义new和delete 因为像对齐(alignment)这样的细节问题的存在,程序员在专心完成其他任务的时候将这些细节问题忽略会导致各种问题的抛出,这就能够将专业级别的内存管理器区分出来。实现一个能够工作的内存管理器是非常容易的。实现一个工作良好的就非常难了。作为通用规则,我建议你不要尝试,除非有必...
There are three ways to do this: Keyboard shortcuts Select the task(s) you want to remove, and then press Delete. The task list must be open for editing to use this method. Delete Item button Click the space to the left of the check box, or the check mark, for...
are deleted when you delete a version. The other version numbers do not change. For example, if you have a document that has minor versions 2.1 and 2.2, and you decide to delete version 2.1, the resulting version history shows only versions 2.0 and 2.2....