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Fix violation in ranged_parallel_group_launch. #1631

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Fix violation in ranged_parallel_group_launch. #1631

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4 changes: 4 additions & 0 deletions asio/include/asio/experimental/impl/parallel_group.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -717,6 +717,10 @@ void ranged_parallel_group_launch(Condition cancellation_condition,
state, std::move(ex), idx++));
}

// Since all operations have already been completed, cancellation will not be performed.
if (state->outstanding_ == 0)
return;

// Check if any of the operations has already requested cancellation, and if
// so, emit a signal for each operation in the group.
if ((state->cancellations_requested_ -= range_size) > 0)
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