Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Construct a null.

value(
    std::nullptr_t,
    storage_ptr sp = {}) noexcept;

A null value is a monostate.

Constant.

No-throw guarantee.

Name	Description
`sp`	A pointer to the `boost::container::pmr::memory_resource` to use. The container will acquire shared ownership of the memory resource.