The line you quoted is simply the start of the definition of a function called mask. If you don't understand functions in C++ it may be worth reading a good C++ tutorial. E.g. https://www.tutorialspoint.com/cplusplus/cpp_functions.htm
Steve
The line you quoted is simply the start of the definition of a function called mask. If you don't understand functions in C++ it may be worth reading a good C++ tutorial. E.g. https://www.tutorialspoint.com/cplusplus/cpp_functions.htm
Steve