https://svn.boost.org/trac10/ticket/12502 <p> Please add the following pre-processor define (or similar) around the static variables in "boost/asio/error.hpp" such that the warnings about unused variables can be switched off in client code. </p> <p> Analog to boost/system/error_code.hpp: </p> <p> #ifndef BOOST_SYSTEM_NO_DEPRECATED static const boost::system::error_category&amp; system_category </p> <h1 class="section" id="boost::asio::error::get_system_category">boost::asio::error::get_system_category();</h1> <p> static const boost::system::error_category&amp; netdb_category </p> <h1 class="section" id="boost::asio::error::get_netdb_category">boost::asio::error::get_netdb_category();</h1> <p> static const boost::system::error_category&amp; addrinfo_category </p> <h1 class="section" id="boost::asio::error::get_addrinfo_category">boost::asio::error::get_addrinfo_category();</h1> <p> static const boost::system::error_category&amp; misc_category </p> <h1 class="section" id="boost::asio::error::get_misc_category">boost::asio::error::get_misc_category();</h1> <p> #endif </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/12502 Trac 1.4.3 anonymous Thu, 12 Jan 2017 16:45:17 GMT