Commit Graph

2 Commits

Author SHA1 Message Date
Jonathan Hamilton 791c8401c1 Update mpark::variant implementation to 1.3.0
Fixes building on the latest clang shipping on MacOS
(Apple LLVM version 9.1.0 (clang-902.0.39.1))
2018-05-11 11:15:06 -07:00
Léo Lam b08653d69d Common: Add a std::optional implementation
std::optional makes a few things a bit neater and less error prone.
However, we still cannot use C++17 (unfortunately), so this commit
adds an implementation of std::optional that we can use right now.

Based on https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/lib/gtl/optional.h
which seems to be fairly similar to C++17's <optional> and standards
compliant. It's one of the few implementations that handle propagating
type traits like copy constructibility, just like libc++/libstdc++.
2017-06-03 12:36:24 +02:00