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Python ranges in C++
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| #ifndef RANGE_HPP_ | |
| #define RANGE_HPP_ | |
| template<typename T> class RangeIterator; | |
| template<typename T> | |
| class Range | |
| { | |
| T _start, _end, _step; | |
| public: | |
| Range(T start, T end, T step = T(1)) | |
| : _start(start), _end(end), _step(step) | |
| { | |
| } | |
| RangeIterator<T> begin() const; | |
| RangeIterator<T> end() const; | |
| }; | |
| template<typename T> | |
| Range<T> range(T end) | |
| { | |
| return Range<T>(T(0), end, T(1)); | |
| } | |
| template<typename T> | |
| Range<T> range(T start, T end, T step = T(1)) | |
| { | |
| return Range<T>(start, end, step); | |
| } | |
| template<typename T> | |
| class RangeIterator | |
| { | |
| T _pos, _step; | |
| public: | |
| RangeIterator(T pos, T step) : _pos(pos), _step(step) {} | |
| bool operator!=(const RangeIterator &o) const { return _pos < o._pos; } | |
| RangeIterator &operator++() { _pos += _step; return *this; } | |
| RangeIterator operator++(int) { RangeIterator copy(*this); operator++(); return copy; } | |
| T operator*() const { return _pos; } | |
| }; | |
| template<typename T> | |
| RangeIterator<T> Range<T>::begin() const { return RangeIterator<T>(_start, _step); } | |
| template<typename T> | |
| RangeIterator<T> Range<T>::end() const { return RangeIterator<T>(_end, _step); } | |
| #endif /* RANGE_HPP_ */ |
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