P0228 unique_function: a move-only std::function

[jensmaurer]

P0228R3 unique_function: a move-only std::function (Ryan McDougall, Matt Calabrese)

[tituswinters]

LEWG in Kona:
Call operator qualifiers.
Paper as specified func(), func() &&, func() const
Perhaps add func() const&, func() &.

Add support for func() const& and func()&.
SF F N A SA
0 8 7 0 0

noexcept

Add support for func() noexcept (x all of the above)
SF F N A SA
2 12 2 0 0

Include the option for CTAD.
SF F N A SA
0 1 5 9 0

callable vs. any_invocable
SC C N AI SAI
3 2 3 5 6

Suggest the addition of the in-place constructor.
Unanimous consent

Header choice
<any_invocable> vs.
SAI AI N I SI
3 7 2 5 1
(Authors choice among those two.)

Can get std::function from <any_invocable>
SF F N A SA
0 1 4 4 7

Can get std::function from
SF F N A SA
1 3 6 3 2

Can get it from .
Unanimous consent

Remove the null-check in the call operator and throwing of bad_function_call.
SF F N A SA
8 2 1 0 0

Remove the null-check in constructors that are not nullptr_t.
SF F N A SA
0 2 2 4 3

Perfect forwarding is allowed for converting constructor.
Unanimous consent

Update as above for the post-meeting mailing, forward to LWG for C++20.
SF F N A SA
8 5 0 0 0

[JeffGarland]

This was forwarded for C++20 adding the IS tag

[jensmaurer]

Typo in paper number; see P0288 any_invocable #400 for the correct one.

[jwakely]

N.B. before the paper number P0228 was hijacked for R3 and R6 of P0288 it was actually a different paper:

P0228R0: [Library Evolution] A Proposal to Add Safe Integer Types to the Standard Library Technical Report https://wg21.link/p0228r0 (by Robert Ramey) (2016-02-16) (Related: https://wg21.link/p0228r0/github)