Construct a signal set without adding any signals.

explicit signal_set(
    asio::io_context & io_context);
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Construct a signal set and add one signal.

signal_set(
    asio::io_context & io_context,
    int signal_number_1);
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Construct a signal set and add two signals.

signal_set(
    asio::io_context & io_context,
    int signal_number_1,
    int signal_number_2);
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Construct a signal set and add three signals.

signal_set(
    asio::io_context & io_context,
    int signal_number_1,
    int signal_number_2,
    int signal_number_3);
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