P1292 Customization Point Functions

[wg21bot]

P1292R0 Customization Point Functions (Matt Calabrese)

[jensmaurer]

Marked as "backlog" on San Diego EWG-I wiki.

[jfbastien]

Seen in SAN.
Want more get more implementation / usage experience before moving forward.

[jfbastien]

EWG-I in Kona:
Do we want to see P1292 again?
| SF | F | N | A | SA |
| 8 | 7 | 3 | 0 | 0 |

Propose a way to declare a function that inhibits ADL and is not found by ADL, and behaves like a function object.
| SF | F | N | A | SA |
| 4 | 6 | 7 | 1 | 0 |
A/SC votes: don't think they can be split up at thins point, but am in favor of this feature