On 4/9/2013 12:52 AM, Manu wrote:
But that's meaningless though, because there's always the possibility that
something somewhere else may have a non-const reference to that thing.
Can you suggest a case where const could EVER be used in any sort of
optimisation?
Sure:
pure int bar(const int*);
int foo(int* pt) {
int t = *pt; // (1)
int x = bar(&t);
return t + // guaranteed to be same value as (1)
x;
}
But the main purpose of const is so that you can have a single function that can
operate on both mutable and immutable references. Otherwise, you'd have to do
the copy/pasta two-step and write two functions.
