C++ named requirements: MoveAssignable (since C++11)

< cpp‎ | named req
C++ named requirements

Specifies that an instance of the type can be assigned from an rvalue argument.

[edit] Requirements

The type T satisfies MoveAssignable if


The following expressions must be valid and have their specified effects

Expression Return type Return value Post-conditions
t = rv T& t If t and rv do not refer to the same object , the value of t is equivalent to the value of rv before the assignment.

The new value of rv is unspecified

[edit] Notes

The type does not have to implement move assignment operator in order to satisfy this type requirement: a copy assignment operator that takes its parameter by value or as a const Type&, will bind to rvalue argument.

If a MoveAssignable class implements a move assignment operator, it may also implement move semantics to take advantage of the fact that the value of rv after assignment is unspecified.

[edit] See also

checks if a type has a move assignment operator
(class template) [edit]