Revise the program you wrote in the exercises in § 6.3.2 (p. 228) that used recursion to print the contents of a vector to conditionally print information about its execution. For example, you might print the size of the vector on each call. Compile and run the program with debugging turned on and again with it turned off.
§ 6.3.2 (p. 228)
Exercise 6.30
Compile the version of str_subrange as presented on page 223 to see what your compiler does with the indicated errors.
Exercise 6.31
When is it valid to return a reference? A reference to const?
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