#### signal_set::signal_set

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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