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Open the acceptor using the specified protocol.
void open(
const protocol_type & protocol,
asio::error_code & ec);
This function opens the socket acceptor so that it will use the specified protocol.
An object specifying which protocol is to be used.
Set to indicate what error occurred, if any.
asio::ip::tcp::acceptor acceptor(io_context);
asio::error_code ec;
acceptor.open(asio::ip::tcp::v4(), ec);
if (ec)
{
// An error occurred.
}