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# C++ concepts: MoveAssignable (since C++11)

From cppreference.com
< cpp‎ | concept

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

### [edit] Requirements

The type `T` satisfies `MoveAssignable` if

Given

- `t`, a modifiable lvalue expression of type `T`
- `rv`, an rvalue expression of type `T`

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

is_move_assignable is_trivially_move_assignable is_nothrow_move_assignable (C++11)(C++11)(C++11) | checks if a type has a move assignment operator (class template) [edit]

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