Exercise · Building and the Preprocessor · lesson 7 of 7
Exercise: macros to constexpr
Replace the macros kMaxUsers and square in the file. Make kMaxUsers a constexpr int equal to 100, and write constexpr int square(int x), which returns the square of x. Keep the names: the tests use them and also check that kMaxUsers and square are no longer macros.
square(2 + 1)→9100 / square(5)→4kMaxUsers→100
Constraints: square takes any int expression, negative ones too, and its result fits in an int; one call runs at compile time.
