Commits

Antoine Pitrou authored 89a18b5381e
ARROW-5252: [C++] Use standard-compliant std::variant backport Replace mapbox::variant with Michael Park's variant implementation. Author: Antoine Pitrou <antoine@python.org> Closes #4259 from pitrou/ARROW-5252-variant-backport and squashes the following commits: 03dbc0e14 <Antoine Pitrou> ARROW-5252: Use standard-compliant std::variant backport