David Schneider b8c77d4041 Make inclusion of header <optional> opt-out via macro (#7168) ...

* Allow suppression of including <optional> via macro

* Combine preprocessor conditions

* Make inclusion of header <optional> opt-in

* Make inclusion of <optional> opt-out via macro

* Auto-detect C++17+ when defining macro

* Enclose macro expression in parentheses

* Check value of macro, not whether it's defined

* Fix parentheses

* Don't define macro with expression using other macros

The preprocessor doesn't seem to like it.

* Fix parentheses

2022-03-15 17:52:11 -07:00

..

flatbuffers

Make inclusion of header <optional> opt-out via macro (#7168)

2022-03-15 17:52:11 -07:00