JoshuaOloton opened a new issue, #46233:
URL: https://github.com/apache/arrow/issues/46233
### Describe the bug, including details regarding any error messages,
version, and platform.
When building Arrow in Debug configuration with compilers that enforce
`-Wmissing-braces` (e.g., Clang with `-Werror`), the following error occurs:
```
C:\src\arrow\cpp\src\arrow\util\thread_pool.cc(174,39): error: suggest
braces around initialization of subobject [-Werror,-Wmissing-braces]
174 | state->task_queue.push(QueuedTask{std::move(task),
std::move(stop_token),
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| {
175 | std::move(stop_callback),
hints.priority,
| ~~~~~~~~~~~~~~~~~~~~~~~~
| }
1 error generated.
ninja: build stopped: subcommand failed.
```
The error occurs in `thread_pool.cc` where a `QueuedTask` is being
constructed, but the initialization of the nested Task member is missing
braces, causing the compiler to issue a `-Wmissing-braces` warning.
### Current Code
```
state->task_queue.push(QueuedTask{std::move(task), std::move(stop_token),
std::move(stop_callback),
hints.priority,
state_->spawned_tasks_count_++});
```
### Proposed Change
Wrap the first three parameters (which initialize the Task member) with an
extra pair of curly braces {}.
```
state->task_queue.push(QueuedTask{{std::move(task), std::move(stop_token),
std::move(stop_callback)},
hints.priority,
state_->spawned_tasks_count_++});
```
### Additional Information
The `QueuedTask` struct declaration:
```
struct QueuedTask {
Task task;
int32_t priority;
uint64_t spawn_index;
// Implement comparison so that std::priority_queue will pop the low
priorities more
// urgently.
bool operator<(const QueuedTask& other) const {
if (priority == other.priority) {
// Maintain execution order for tasks with the same priority. Its
preferable to keep
// the execution order of tasks deterministic.
return spawn_index > other.spawn_index;
}
return priority > other.priority;
}
};
```
### Environment
- Compiler: Clang
- Platform: Windows
- Build system: Ninja + CMake
### Component(s)
C++
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