P3699R0R1
Rename `conqueue_errc`

1. Revision History

This paper revises P3699R0 - 2025-05-17 as follows:

• adding more name options

2. Introduction

The proposal for concurrent queues C++ Concurrent Queues (P0260) uses an enumeration to specify possible return states of some queue operations. This enumeration is called conqueue_errc as it was originally meant for exceptions. However, the concurrent queue proposal doesn’t propose it’s own exception class anymore, so the name is misleading.

enum class conqueue_errc { success, empty, full, closed, busy, busy_async };

3. Name Options

In initial revisons of P0260 the enumeration was called queue_op_state. But op_state has a specific meaning in S/R context that completely different.

Dropping the op gives us queue_state. To make it clear that it’s specific to concurrent queues we could also name it conqueue_state.

From the reflector we got more proposals, so here’s a list:

• queue_state

• conqueue_state

• queue_status

• conqueue_status

• conqueue_result

• conqueue_op_status

• conqueue_op_result

4. Proposal

Rename std::conqueue_errc to std::XYZ.