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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/memory/indirect.html below:

std::indirect - cppreference.com

1) std::indirect is a wrapper containing dynamically-allocated object with value-like semantics.

An std::indirect object manages the lifetime of an owned object. An std::indirect object can only have no owned object after it has been moved from, in this case it is valueless .

Every object of type std::indirect<T, Allocator> uses an object of type Allocator to allocate and free storage for the owned object as needed.

If a program declares an explicit or partial specialization of std::indirect, the behavior is undefined.

[edit] Template parameters T - the type of the owned object Allocator - the type of the associated allocator Type requirements -T may be an incomplete type. -If T is one of the following types, the program is ill-formed:
-If Allocator does not satisfy the requirements of Allocator, the program is ill-formed. -If std::allocator_traits<Allocator>::value_type is not the same type as T, the program is ill-formed. [edit] Nested types [edit] Data members Member Description pointer p a pointer to the owned value
(exposition-only member object*) Allocator alloc the asociated allocator
(exposition-only member object*) [edit] Member functions [edit] Non-member functions [edit] Helper classes [edit] Deduction guides [edit] Notes [edit] Example [edit] See also a polymorphic wrapper containing dynamically-allocated object with value-like semantics
(class template) [edit] smart pointer with unique object ownership semantics
(class template) [edit]

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