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39 lines
776 B
39 lines
776 B
// Taken from https://gist.github.com/arvidsson/7231973 |
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#ifndef BITCOIN_REVERSE_ITERATOR_H |
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#define BITCOIN_REVERSE_ITERATOR_H |
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/** |
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* Template used for reverse iteration in C++11 range-based for loops. |
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* |
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* std::vector<int> v = {1, 2, 3, 4, 5}; |
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* for (auto x : reverse_iterate(v)) |
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* std::cout << x << " "; |
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*/ |
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template <typename T> |
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class reverse_range |
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{ |
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T &m_x; |
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public: |
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explicit reverse_range(T &x) : m_x(x) {} |
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auto begin() const -> decltype(this->m_x.rbegin()) |
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{ |
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return m_x.rbegin(); |
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} |
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auto end() const -> decltype(this->m_x.rend()) |
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{ |
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return m_x.rend(); |
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} |
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}; |
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template <typename T> |
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reverse_range<T> reverse_iterate(T &x) |
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{ |
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return reverse_range<T>(x); |
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} |
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#endif // BITCOIN_REVERSE_ITERATOR_H
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