[libc-commits] [PATCH] D150211: [libc] Rework cpp::optional

[Mikhail Ramalho via Phabricator via libc-commits]

mikhail.ramalho created this revision.
mikhail.ramalho added reviewers: sivachandra, michaelrj, jhuber6.
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This patch is a rewrite of cpp::optional to support non trivially
constructable, copyable, or movable types.

The motivation is to support cpp::optional<UInt<128>> (used by
UInt<T>::div), which is used when a platform does not support native
int128_t types (e.g., riscv32).

The code here is a trimmed down version of llvm::optional.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D150211

Files:
  libc/src/__support/CPP/optional.h
  libc/src/__support/CPP/type_traits.h
  libc/src/__support/UInt.h
  libc/test/src/__support/CPP/optional_test.cpp

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