how to print the content of a c++ function argument given such information

I have a c++11 code which has a function like the following:

bool prepareSwitch(const std::list<hardware_interface::ControllerInfo>& start_list,
                   const std::list<hardware_interface::ControllerInfo>& stop_list)

for debugging this code, I'd like to investigate/print for example the start_list, however, having a quite basic experience in c++ has made this confusing for me. Yet, the additional information that I can have about this input argument is about <hardware_interface::ControllerInfo> the described in this documentation.

I'm not sure how to use this information to print or investigate this input. Can someone guide a little about it?

using std::cout << start_list << std::endl; gave a compilation error.