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40 lines
776 B
C++
40 lines
776 B
C++
// 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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