A function can return a value of type T in one of several different ways. Which of these is correct? If correct, give a short declaration of a function that returns its value by these mechanism. Comment on the const methods of function return value. Comment on when there is danger involved in returning a reference of any kind from a function. Finally, which one of these returns an l-value and which an r-value?
a) By value
b) By lazy evaluation.
c) By reference
d) By const value
e) By const reference
a) T f() x
b) Not a mechanism known in C++
c) T& f()
d) const T f()
e)const T& f()
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