C++ concepts: MoveInsertable (since C++11)
Specifies that a rvalue of the type can be copied in uninitialized storage.
MoveInsertable into the
X if, given
|| the allocator type defined as |
|| the lvalue of type |
|| the pointer of type |
|| rvalue expression of type |
the following expression is well-formed:
std::allocator_traits<A>::construct(m, p, rv);
And after evaluation, the value of
*p is equivalent to the value formerly held by
rv remains valid, but unspecified)
A is std::allocator<T>, then this will call placement-new, as by ::new((void*)p) T(rv).
If std::allocator<T> or a similar allocator is used, 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 MoveInsertable 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.