RAII.md

RAII

There are a few design points illustrating the use of RAII (Resource Acquisition Is Initialization)

• TcpConnection owns the connection file descriptor. It hold a unique pointer to a connection Socket. In the ctor of TcpConnection, it will create an RAII object of Socket. The file descriptor binded to that Socket is close by the dtor of Socket (by calling ::close). So when TcpConnection is destroyed, the dtor of TcpConnection doesn't need to do anything with the Socket's file descriptor, because the Socket object itself can manage it. The essence of RALL is resource lifetime management: you don't have to manually call new/delete to control resource usage.