std::experimental::get_underlying

From cppreference.com
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Special mathematical functions (special math TR)
template< class T >
constexpr T& get_underlying(propagate_const<T>& pt) noexcept;
(library fundamentals TS v2)
template< class T >
constexpr const T& get_underlying(const propagate_const<T>& pt) noexcept;
(library fundamentals TS v2)

Retrieves a reference to the pointer-like object stored in a propagate_const.

Parameters

pt - a propagate_const object

Return value

A reference to the pointer-like object stored in pt.