如果要自定义移动赋值运算符,考虑自赋值安全C.65: Make move assignment safe for self-assignment。 classFoo{strings;inti;public:Foo&operator=(Foo&&a)noexcept;// ...};Foo&Foo::operator=(Foo&&a)noexcept{if(this==&a)return*this;// 如果不确定自赋值是否安全,最好还是做一下检查s=std::move(a....
移动构造函数(move constructor)和移动赋值操作符(move assignment operator)的作用是允许将临时对象或资源所有权从一个对象转移给另一个对象,而无需执行深层的数据拷贝和分配新资源。相比复制构造函数和复制赋值操作符,移动操作通常更加高效,因为它只需要重新指定资源的所有权关系,而不需要执行资源的复制或分配。 移动构...
Then we try to move the data from object o1 to o2 by assigning an rvalue reference (of object o1) using the std::move(o1) expression to object o2. This invokes the move assignment operator in our object o2. The move assignment operator implementation itself uses the std::move()function ...
b2 = std::move(b1); // calls implicit move assignment std::cout << "After move, b1.s = \"" << b1.s << "\"\n"; std::cout << "\nTrying to move-assign C\n"; C c1, c2; c2 = std::move(c1); // calls the copy assignment operator std::cout << "\nTrying to move...
std::cout << "Move assignment operator "; return *this; } }; int main() { Obj obj1; /* Default constructor */ Obj obj2 = std::move(obj1); /* Move constructor */ Obj obj3; obj3 = std::move(obj2); /* Move assignment operator */ ...
3. 移动赋值运算符(Move Assignment Operator)的作用和定义方式 移动赋值运算符是一种特殊的赋值运算符,它同样接受一个右值引用作为参数,用于将资源的所有权从一个对象转移到另一个对象。它的作用类似于移动构造函数,但用于已存在的对象。 定义方式如下:
A move assignment operator has the following signature: C& C::operator=(C&& other);//C++11 move assignment operator A move assignment operator is similar to a copy constructor except that before pilfering the source object, it releases any resources that its object may own. The move assignmen...
(IntNum&&n):xptr(n.xptr)//两个& 表示右值的引用{n.xptr=nullptr;cout<<"Calling Move Assignment Operator..."<<endl;}IntNum::~IntNum(){deletexptr;cout<<"Destructing..."<<endl;}IntNumgetNum(){IntNuma;returna;}intmain(intargc,char*argv[]){cout<<getNum().getInt()<<endl;return...
A&operator=(constA&& a) { std::cout <<"Move Assignment Operators"<< std::endl; return*this; } }; intmain() { A a;// Constructors A a_5;// Constructors A a_6;// Constructors A&& a_1 = std::move(a);// 没有提示 ...
C++, C, and Assembler C++ Save Add to CollectionsAdd to plan Share via Facebookx.comLinkedInEmail Print Move Constructors and Move Assignment Operators (C++) Article 08/03/2021 9 contributors Feedback In this article Example: Complete move constructor and assignment operator ...