C++ - 为包含字符串的类移动构造函数

Question

class Foo { int a; int b; int c; std::wstring d; std::vector<char*> e };

Assuming a large string (~512 bytes) and ~512 bytes for the std::vector and it's use case as the following:

void Test()
{
    Foo foo;
    DoSomething(std::move(foo)); // DoSomething will stuff it in a long-lived queue
}

Essentially I want the RAII's object's lifetime to change.

Is this when I implement a move constructor and assignment operator? Or just doing std::move(..) is good enough?

Answer 1

std::move is useless without move constructor and/or move assignment operator.

However all members of your class are movable and you don't have any user-defined destructor, copy constructor or copy assigment operator, so there will be an implicitly defined move constructor and move assignment operator doing the correct thing.

So in this specific case the answer is that you don't need to define a move constructor or assignment operator.