C++ named requirements: MoveAssignable (since C++11)
From cppreference.com
C++
C++ named requirements
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Specifies that an instance of the type can be assigned from an rvalue argument.
Requirements
The type T satisfies MoveAssignable if
Given
t, a modifiable lvalue expression of typeT,rv, an rvalue expression of typeT.
The following expressions must be valid and have their specified effects.
| Expression | Return type | Return value | Post-conditions |
|---|---|---|---|
| t = rv | T&
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t
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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 |
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&
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
See also
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(C++11)(C++11)(C++11)
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checks if a type has a move assignment operator (class template) |
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(C++20)
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specifies that a type is assignable from another type (concept) |