C++17 N4659 standard draft
For a quick cross standard reference, have a look at the "Implicitly-declared" sections of the following cppreference entries:
The same information can of course be obtained from the standard. E.g. on C++17 N4659 standard draft:
15.8.1 "Copy/move constructors" says for for copy constructor:
6 If the class definition does not explicitly declare a copy constructor, a non-explicit one is declared implicitly.
If the class definition declares a move constructor or move assignment operator, the implicitly declared copy
constructor is defined as deleted; otherwise, it is defined as defaulted (11.4). The latter case is deprecated if
the class has a user-declared copy assignment operator or a user-declared destructor.
and for move constructor:
8 If the definition of a class X does not explicitly declare a move constructor, a non-explicit one will be implicitly
declared as defaulted if and only if
(8.1)
— X does not have a user-declared copy constructor,
(8.2)
— X does not have a user-declared copy assignment operator,
(8.3)
— X does not have a user-declared move assignment operator, and
(8.4)
— X does not have a user-declared destructor.
15.8.2 "Copy/move assignment operator" says for copy assignment:
2 If the class definition does not explicitly declare a copy assignment operator, one is declared implicitly.
If the class definition declares a move constructor or move assignment operator, the implicitly declared
copy assignment operator is defined as deleted; otherwise, it is defined as defaulted (11.4). The latter
case is deprecated if the class has a user-declared copy constructor or a user-declared destructor.
and for move assignment:
4 If the definition of a class X does not explicitly declare a move assignment operator, one will be implicitly
declared as defaulted if and only if
- (4.1) — X does not have a user-declared copy constructor,
- (4.2) — X does not have a user-declared move constructor,
- (4.3) — X does not have a user-declared copy assignment operator, and
- (4.4) — X does not have a user-declared destructor.
15.4 "Destructors" says it for destructors:
4 If a class has no user-declared destructor, a destructor is implicitly declared as defaulted (11.4). An
implicitly-declared destructor is an inline public member of its class.