# C++ named requirements: MoveConstructible (since C++11)

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< cpp‎ | named req

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

### Requirements

The type `T` satisfies MoveConstructible if

Given

- `rv`, an rvalue expression of type `T`,
- `u`, an arbitrary identifier.

The following expressions must be valid and have their specified effects.

Expression | Post-conditions
--- | ---
T u = rv; | The value of `u` is equivalent to the value of `rv` before the initialization. The new value of `rv` is unspecified.
T(rv) | The value of `T(rv)` is equivalent to the value of `rv` before the initialization. The new value of `rv` is unspecified.

### Notes

A class does not have to implement a move constructor to satisfy this type requirement: a copy constructor that takes a `const T&` argument can bind rvalue expressions.

If a MoveConstructible class implements a move constructor, it may also implement move semantics to take advantage of the fact that the value of `rv` after construction is unspecified.

### See also

is_move_constructible is_trivially_move_constructible is_nothrow_move_constructible (C++11)(C++11)(C++11) | checks if a type can be constructed from an rvalue reference (class template)
move_constructible (C++20) | specifies that an object of a type can be move constructed (concept)

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