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std::experimental::get_underlying

From cppreference.com
template< class T >
constexpr T& get_underlying(propagate_const<T>& pt);
(library fundamentals TS v2)
template< class T >
constexpr const T& get_underlying(const propagate_const<T>& pt);
(library fundamentals TS v2)

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

[edit] Parameters

pt - a propagate_const object

[edit] Return value

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

[edit] Exceptions

noexcept specification:  
noexcept