C ++ Rule of zero and what is a constructor declared by a user?

Question

In Transparency in the explanation , I narrowed the message.

After reading this article: The Rule of Zero ,

I understood the most, but I still want to solve some of the obscure problems that I have:

1. Looking at this phrase:

If the definition of class X does not explicitly declare the move constructor, it will be declared as implicit as default if and only if:

X does not have a user-declared copy constructor, and

X does not have a user-declared copy destination operator,

X does not have a user-declared move destination operator,

X does not have a user-declared destructor, and

The move constructor will not be implicitly defined as remote.

Should all 5 statements coexist (share "and" attitude), or only some of them (share "or" attitude)?

2. What does the user-declared "copy constructor \ instance copy operator ... mean?"

• declares it (any of the above lists) in the .h file, but doesn't implement it as declared by the user?

• declares it (any of the above) in the .h file and indicates " = deleted " or " = default ", announced?

• declares it (any of the above) in an .h file with an empty bracelet, {}, is it considered a declared user?

reverence

Etay

Answer 1

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