llvm::OptionalValueCast

Synopsis

Declared in <llvm/Support/Casting.h>

template<
    typename To,
    typename From,
    typename Derived = void>
struct OptionalValueCast
    : CastIsPossible<To, From>
    , DefaultDoCastIfPossible<std::optional<To>, From, /* implementation-defined */>

Description

This cast trait provides std::optional<T> casting. This means that if you have a value type, you can cast it to another value type and have dyn_cast return an std::optional<T>.

Base Classes

Name	Description
`CastIsPossible<To, From>`	Trait that reports whether a cast from `From` to `To` is possible.
`DefaultDoCastIfPossible<std::optional<To>, From, /* implementation-defined */>`	Provides a default `doCastIfPossible` that uses `isPossible` and `doCast.`

Static Member Functions

Name	Description
`castFailed`	Returns an empty optional when the cast fails.
`doCast`	Constructs a `To` from `f` and wraps it in `std::optional.`
`doCastIfPossible`	Casts `f` to `To` if possible; otherwise returns `castFailed().`
`isPossible`	Returns true if a cast from `f` to `To` is possible.

Derived Classes

Name	Description
`CastInfo<To, std::optional<From>>`	Provide a CastInfo specialized for casting out of `std::optional.`