The rules for auto-generated constructors and operators
May 28th, 2014
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- The default constructor is auto-generated if there is no user-declared constructor (§12.1/5).
- The copy constructor is auto-generated if there is no user-declared move constructor or move assignment operator (because there are no move constructors or move assignment operators in C++03, this simplifies to “always” in C++03) (§12.8/8).
- The copy assignment operator is auto-generated if there is no user-declared move constructor or move assignment operator (§12.8/19).
- The destructor is auto-generated if there is no user-declared destructor (§12.4/4).
C++0x only:
- The move constructor is auto-generated if there is no user-declared copy constructor, copy assignment operator or destructor, and if the generated move constructor is valid (e.g. if it wouldn’t need to assign constant members) (§12.8/10).
- The move assignment operator is auto-generated if there is no user-declared copy constructor, copy assignment operator or destructor, and if the generated move assignment operator is valid (e.g. if it wouldn’t need to assign constant members) (§12.8/21).
from StackOverflow
