C++ Primer, Fifth Edition

Function Matching with Multiple Parameters

Function matching is more complicated if there are two or more arguments. Given the same functions named f, let’s analyze the following call:

f(42, 2.56);

The set of viable functions is selected in the same way as when there is only one parameter. The compiler selects those functions that have the required number of parameters and for which the argument types match the parameter types. In this case, the viable functions are f(int, int) and f(double, double). The compiler then determines, argument by argument, which function is (or functions are) the best match. There is an overall best match if there is one and only one function for which

• The match for each argument is no worse than the match required ...