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32 lines
1019 B
C++
32 lines
1019 B
C++
#pragma once
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#ifndef __TMPL_H_
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#define __TMPL_H_
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#include <iterator>
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template <typename T = int>
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class range
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{
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private:
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class range_iterator : std::iterator<std::forward_iterator_tag, T>
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{
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private:
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T val, step;
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public:
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range_iterator(T x, T sp) : val(x), step(sp) {}
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bool operator==(const range_iterator &rhs) const noexcept
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{
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if (step > 0) return val - step < rhs.val && val >= rhs.val;
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if (step < 0) return val - step > rhs.val && val <= rhs.val;
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return val == rhs.val;
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}
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bool operator!=(const range_iterator &rhs) const noexcept { return !(*this == rhs); }
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const auto &operator++() { return val += step, *this; }
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T &operator*() { return val; }
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} st, ed;
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public:
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range(T ed) : range(0, ed, 1) {}
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range(T st, T ed, T sp = 1) : st(st, sp), ed(ed, sp) {}
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const range_iterator &begin() { return st; }
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const range_iterator &end() { return ed; }
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};
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#endif |