Specifies that an object of the type can be constructed into uninitialized storage from an rvalue of that type by a given allocator.
T is MoveInsertable into the container
value_type is identical to
T if, given.
| ||an allocator type|
| || an lvalue of type
| || the pointer of type
| || rvalue expression of type
X::allocator_type is identical to
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 is in an unspecified state.).
X is not allocator-aware, the term is defined as if
std::allocator<T>, except that no allocator object needs to be created, and user-defined specializations of
std::allocator are not instantiated.
std::allocator<T>, then this will call placement-new, as by
::new((void*)p) T(rv). This effectively requires
T to be move constructible.
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.
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