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fbbe67869c
Often you have a unique_ptr<T> where T supports LLVM's
casting methods, and you wish to cast it to a unique_ptr<U>.
Prior to this patch, this requires doing hacky things like:
unique_ptr<U> Casted;
if (isa<U>(Orig.get()))
Casted.reset(cast<U>(Orig.release()));
This is overly verbose, and it would be nice to just be able
to use unique_ptr directly with cast and dyn_cast. To this end,
this patch updates cast<> to work directly with unique_ptr<T>,
so you can now write:
auto Casted = cast<U>(std::move(Orig));
Since it's possible for dyn_cast<> to fail, however, we choose
to use a slightly different API here, because it's awkward to
write
if (auto Casted = dyn_cast<U>(std::move(Orig))) {}
when Orig may end up not having been moved at all. So the
interface for dyn_cast is
if (auto Casted = unique_dyn_cast<U>(Orig)) {}
Where the inclusion of `unique` in the name of the cast operator
re-affirms that regardless of success of or fail of the casting,
exactly one of the input value and the return value will contain
a non-null result.
Differential Revision: https://reviews.llvm.org/D31890
llvm-svn: 300098
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