[#llvm-CastInfo-0f5]
= xref:llvm.adoc[llvm]::xref:llvm/CastInfo-01.adoc[CastInfo]<To, xref:llvm/PointerUnion.adoc[PointerUnion<PTs...>]>
:relfileprefix: ../
:mrdocs:

CastInfo specialization for non‐const PointerUnion sources.

== Synopsis

Declared in `<llvm/ADT/PointerUnion.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename To,
    typename... PTs>
struct xref:llvm/CastInfo-01.adoc[CastInfo]<To, xref:llvm/PointerUnion.adoc[PointerUnion<PTs...>]>
    : xref:llvm/DefaultDoCastIfPossible.adoc[DefaultDoCastIfPossible<To, PointerUnion<PTs...>, CastInfo<To, PointerUnion<PTs...>>>]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:llvm/DefaultDoCastIfPossible.adoc[DefaultDoCastIfPossible<To, PointerUnion<PTs...>, CastInfo<To, PointerUnion<PTs...>>>]`
| Provides a default `doCastIfPossible` that uses `isPossible` and `doCast.`
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:llvm/CastInfo-0f5/From.adoc[`From`] 
| Source PointerUnion type for this cast specialization.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/CastInfo-0f5/castFailed.adoc[`castFailed`] 
| Return a null `To` value when a cast fails.
| xref:llvm/CastInfo-0f5/doCast.adoc[`doCast`] 
| Extract the `To` pointer from `F;` asserts the tag matches.
| xref:llvm/DefaultDoCastIfPossible/doCastIfPossible.adoc[`doCastIfPossible`] 
| Casts `f` to `To` if possible; otherwise returns `castFailed().`
| xref:llvm/CastInfo-0f5/isPossible.adoc[`isPossible`] 
| Return true if `F` currently holds a pointer of type `To.`
|===



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