Category flag controlling how a bound argument is passed or stored.
Declared in <folly/lang/bind/Bind.h>
enum class category_t : int;| Name | Description |
|---|---|
unset | The policy decides; standard storage uses value, argument-binding uses ref. |
ref | Follows the reference category of the input, i.e. InputT&&. |
value | Copies or moves, depending on the input ref type. |
copy | Store: like value but fails on rvalue input; argument: pass folly::copy(). |
move | Store: like value but fails on lvalue input; argument: pass the rvalue ref. |