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

One liner that should work for any type, not only numeric:

replace(begin(foo), end(foo), make_pair(foo.front(),0).first, 13);

or without creating extra field:

replace(begin(foo), end(foo), get<0>( make_tuple(foo.front()) ), 13);