Fix redefinition of function template #1638
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In MSVC, I've got compile error like below (sorry, I'm Japanese so the error messages are Japanese):
Well, the messages says that the functions
boost::beast::teardown
andboost::beast::teardown_async
were redefined despite the functions had already defined.It seems that the
friend
functions were redefined when thessl_stream
was instantiated more than once with each different type parameters likeboost::beast::ssl_stream<boost::beast::tcp_stream>
andboost::beast::ssl_stream<boost::asio::ip::tcp::socket>
.This PR fixes this issue.