In C++, how to iterate array in reverse using for_each?

Question

In C++11, using lambda/for_each, how do we iterate an array from end?

I tried the following, but both result in infinite loop:

for_each (end(A), begin(A), [](int i) {
   ....
});

for_each (A.rend(), A.rbegin(), [](int i) {
    ...
});

Any idea? Thanks.

Answer 1

You missed this ?

Flip your rbegin & rend

for_each (A.rbegin(), A.rend(), [](int i) {
    ...
});

Increasing reverse iterator moves them towards the beginning of the container

Answer 2

Boost offers a feature named reversed, that can be used with C++ 11 range based for loop as describes Yakk in his answer:

for(int i : reverse(A))
{
  // code
}

or

for(int i : A | reversed)
{
  // code
}