Why was pair range access removed from C++11?

Question

I just discovered that at one point, the C++11 draft had std::begin/std::end overloads for std::pair that allowed treating a pair of i

Answer 1

expanding on the above answer using c++11 optimisations:

#include 

template
struct range_t : public std::pair {
    using pair_t = std::pair;
    range_t(pair_t&& src)
    : std::pair(std::forward(src))
    {}

    using std::pair::first;
    using std::pair::second;

    Iter begin() const { return first; }
    Iter end() const { return second; }
};

template
range_t range(std::pair p) {
    return range_t(std::move(p));
}

template
range_t range(Iter i1, Iter i2) {
    return range_t(std::make_pair(std::move(i1), std::move(i2)));
}


// TEST: 

#include 
#include 
using namespace std;

int main() {

    multiset mySet { 6,4,5,5,5,3,3,67,8,89,7,5,45,4,3 };

    cout << "similar elements: ";
    for (const auto&i : range(mySet.lower_bound(5), mySet.upper_bound(10))) {
        cout << i << ",";
    }
    cout << "\n";

    int count = 0, sum = 0;
    for (const auto& i: range(mySet.equal_range(5)))
    {
        ++count;
        sum += i;
    }
    cout << "5 appears " << count << " times\n"
    << "the sum is " << sum << "\n";

return 0;
}