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A move accept handler must meet the requirements for a handler.
A value h of a move accept handler class should work correctly
in the expression h(ec, s), where ec is an lvalue
of type const error_code and s is an lvalue of
the nested type Protocol::socket for the type Protocol
of the socket class template.
A free function as a move accept handler:
void accept_handler(
const asio::error_code& ec, asio::ip::tcp::socket s)
{
...
}
A move accept handler function object:
struct accept_handler
{
...
void operator()(
const asio::error_code& ec, asio::ip::tcp::socket s)
{
...
}
...
};
A lambda as a move accept handler:
acceptor.async_accept(...,
[](const asio::error_code& ec, asio::ip::tcp::socket s)
{
...
});
A non-static class member function adapted to a move accept handler using
std::bind():
void my_class::accept_handler(
const asio::error_code& ec, asio::ip::tcp::socket socket)
{
...
}
...
asio::async_accept(...,
std::bind(&my_class::accept_handler,
this, std::placeholders::_1,
std::placeholders::_2));