P2233R1
2020 Fall Library Evolution Polls

Introduction

This paper contains the decision polls that the C++ Library Evolution group will take in Fall of 2020.

Voting

These decision polls will be conducted electronically; see [P2195R0] for more information on electronic voting procedures.

All committee members may vote, but if you have not participated in the Library Evolution discussions of a poll, please choose to not vote.

How to Vote

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Voting Timeline

• 2020-10-13: Draft polls distributed by mailing list.

• 2020-10-22: Final discussion telecon on the polls. Start of the polling period.

• 2020-11-16: Chairs send a reminder to all voters of how they voted.

• 2020-11-19: End of the polling period.

• 2020-11-20: Chairs share results and summarize consensus and conclusions of the results.

Polls

Each poll consists of a statement; you vote on whether you support the statement. All polls will be 5-way polls; you’ll vote either "strongly favor", "weakly favor", "neutral", "weakly against", or "strongly against". If you do not want to participate in a poll, select the "I do not want to participate in this poll" option. Those who do not participate in a poll will not be counted or recorded.

Each poll has a comment field. Please write a few sentences explaining the rationale for your vote.

Poll results and comments will be shared with Library Evolution after the end of the polling period, including attribution of your votes and comments.

If you want to discuss the polls or how you plan on voting, please start an email thread on the Library Evolution mailing list.

Executor Polls

The following C++ Library Evolution polls relate to executors ([P0443R14]), a proposed set of abstractions for asynchronously creating and managing execution agents. These polls are based on the reports of the six breakout groups that reviewed various aspects of the executors proposal in the Summer of 2020 ([P2202R0], [P2203R0], [P2183R0], [P2205R0], [P2206R0], and [P2207R0]).

Poll 0

Remove explicit adaptation from [P0443R14] (Executors) by applying [P2235R0] to [P0443R14]) which will:

• Make schedule only take schedulers.

• Make execute only take executors.

• Make sender and receiver operations like connect only take senders and receivers.

• Add explicit adaptation from executor to scheduler (make_scheduler_from_executor) but not vice versa.

Poll 1

Use one class for each individual trait instead of combined traits classes (sender_traits, etc) in [P0443R14] (Executors).

Poll 2

Remove static_thread_pool from [P0443R14] (Executors). It may be pursued in a follow-on proposal.

Poll 3

Remove any_executor from [P0443R14] (Executors). It may be pursued in a follow-on proposal.

Poll 4

Remove any_executor::target and any_executor::target_type from [P0443R14] (Executors).

Poll 5

[P0443R14] (Executors) is sufficiently mature that we should aim to ship it in C++23.

Other Polls

Poll 6

Send [P2212R1] (Relax Requirements for time_point::clock) to LWG for C++23, classified as an improvement of an existing feature ([P0592R4] bucket 2 item).

Poll 7

Send [P2166R1] (Prohibit basic_string and basic_string_view Construction from nullptr) to LWG for C++23, classified as an improvement of an existing feature ([P0592R4] bucket 2 item).

Poll 8

Send [P2161R0] (Remove Default Candidate Executor) to LWG for the Networking TS Working Draft, classified as a focus work item ([P0592R4] bucket 1 item).