Passing to a Reference Argument by Value

Question

Consider this simple program:

vector foo = {0, 42, 0, 42, 0, 42};
replace(begin(foo), end(foo), foo.front(), 13);

for(const auto& i : foo) co         


        

Answer 1

In this particular case (when the old value is the first of the vector), you can reverse the order of substitution with rbegin() and rend().

In general, I don't know if it's possible, in a simple way, without make a copy.

int main ()
 {
   std::vector foo = {0, 42, 0, 42, 0, 42};
   std::replace(foo.rbegin(), foo.rend(), foo.front(), 13);

   for(const auto & i : foo)
      std::cout << i << '\t';

   std::cout << std::endl;

   return 0;
 }

p.s.: sorry for my bad English.