folly::poly_cast

Synopses

Declared in <folly/detail/PolyDetail.h>

template<
    class T,
    class I>
[[noreturn]]
/* implementation-defined */&
poly_cast(/* implementation-defined */&);

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Returns a reference to the object of type T stored in a PolyRoot.

template<
    class T,
    class I>
/* implementation-defined */&
poly_cast(/* implementation-defined */& that);

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template<
    class T,
    class I>
[[noreturn]]
/* implementation-defined */ const&
poly_cast(/* implementation-defined */ const&);

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Returns a const reference to the object of type T stored in a PolyRoot.

template<
    class T,
    class I>
/* implementation-defined */ const&
poly_cast(/* implementation-defined */ const& that);

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template<
    class T,
    class Poly>
requires detail::IsPoly<Poly>::value
constexpr
decltype(poly_cast<T>(std::declval<Poly>().get()))
poly_cast(Poly&& that);

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template<
    class T,
    class I>
[[noreturn]]
/* implementation-defined */&&
poly_cast(/* implementation-defined */&&);

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/////////////////////////////////////////////////////////////////////////////

template<
    class T,
    class I>
/* implementation-defined */&&
poly_cast(/* implementation-defined */&& that);

» more...

Return Value

A reference to the stored object cast to type T.
A const reference to the stored object cast to type T.
A reference to the T object stored in or referred to by that. Throws BadPolyAccess if that is empty. Throws BadPolyCast if that does not store or refer to an object of type T.

Template Parameters

Name	Description
T	The (unqualified) type to which to cast the `Poly` object.
Poly	The type of the `Poly` object.

Parameters

Name	Description
that	The PolyRoot holding the object.