title: Method for solving error: "cannot instantiate abstract class"
body: <p>I find one of the most time-consuming compiler errors for me is "cannot instantiate abstract class," since the problem is always that I didn't intend for the class to be abstract and the compiler doesn't list which functions are abstract. There's got to be a more intelligent way to solve these than reading the headers 10 times until I finally notice a missing "const" somewhere. How do you solve these?</p>