Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

error::make_error_code

boost::system::error_code make_error_code(
    basic_errors e);
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boost::system::error_code make_error_code(
    netdb_errors e);
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boost::system::error_code make_error_code(
    addrinfo_errors e);
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boost::system::error_code make_error_code(
    misc_errors e);
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boost::system::error_code make_error_code(
    ssl_errors e);
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Requirements

Header: boost/asio/error.hpp

Convenience header: boost/asio.hpp