mark argument of endpoint copy constructor as const to allow for constructing in libc++ std::varaint #1081
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In libc++, apparently deleted copy constructors are required to have a const argument to be able to be put in std::varaint.
Currently,
typedef websocketpp::client<websocketpp::config::asio_client> client; std::variant<std::monostate, client> asdf;
fails to build with
output
This change fixes it.