| Home | Libraries | People | FAQ | More

### placeholders::signal_number

An argument placeholder, for use with std::bind() or boost::bind(), that corresponds to the signal_number argument of a handler for asynchronous functions such as `boost::asio::signal_set::async_wait`.

    unspecified signal_number;

##### Requirements

Header: `boost/asio/placeholders.hpp`

Convenience header: `boost/asio.hpp`