Question file for benchmark/accuracy/syntax/operators

addition.cpp

1. In this file, the addition operator has been overloaded for 
class foo.  Where is this done?  Where is it used?

Answer:
foo operator+(const foo &other) is defined inside the foo class
definition on lines 13-17.  It is an implicit inline member
function.

It is called in main on lines 23 and 24 (twice). 

fcall.cpp

2. In this file, the function call operator has been overloaded
for class foo.  Where is this done?  Where is it used?

Answer:
double &operator()(int i,int j)  is defined inside the foo class
definition on lines 12-16.  It is an implicit inline member
function.

It is used in main on lines 22 and 23.