C++11 auto declaration with and without pointer declarator

Question

What\'s the difference between the types of bar1 and bar2?

int foo = 10;
auto bar1 = &foo;
auto *bar2 = &foo;

Answer 1

There is a big difference when you use const qualifiers:

int i;

// Const pointer to non-const int
const auto ip1 = &i; // int *const
++ip1; // error
*ip1 = 1; // OK

// Non-const pointer to const int
const auto* ip2 = &i; // int const*
++ip2; // OK
*ip2 = 1; // error