reverse_iterator.h

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// Taken from https://gist.github.com/arvidsson/7231973
 
#ifndef BITCOIN_REVERSE_ITERATOR_HPP
#define BITCOIN_REVERSE_ITERATOR_HPP
 
template <typename T> class reverse_range {
    T &x;
 
public:
    explicit reverse_range(T &xin) : x(xin) {}
 
    auto begin() const -> decltype(this->x.rbegin()) { return x.rbegin(); }
 
    auto end() const -> decltype(this->x.rend()) { return x.rend(); }
};
 
template <typename T> reverse_range<T> reverse_iterate(T &x) {
    return reverse_range<T>(x);
}
 
#endif // BITCOIN_REVERSE_ITERATOR_HPP