You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
32 lines
988 B
C++
32 lines
988 B
C++
#pragma once
|
|
#ifndef __TMPL_H_
|
|
#define __TMPL_H_
|
|
#include <iterator>
|
|
template <typename T = int>
|
|
class range
|
|
{
|
|
private:
|
|
class range_iterator : std::iterator<std::forward_iterator_tag, T>
|
|
{
|
|
private:
|
|
T val, step;
|
|
public:
|
|
range_iterator(T x, T sp) : val(x), step(sp) {}
|
|
bool operator==(const range_iterator &rhs) const noexcept
|
|
{
|
|
if (step > 0) return val - step < rhs.val && val >= rhs.val;
|
|
if (step < 0) return val - step > rhs.val && val <= rhs.val;
|
|
return val == rhs.val;
|
|
}
|
|
bool operator!=(const range_iterator &rhs) const noexcept { return !(*this == rhs); }
|
|
const auto &operator++() { return val += step, *this; }
|
|
T &operator*() { return val; }
|
|
} st, ed;
|
|
|
|
public:
|
|
range(T ed) : range(0, ed, 1) {}
|
|
range(T st, T ed, T sp = 1) : st(st, sp), ed(ed, sp) {}
|
|
const range_iterator &begin() { return st; }
|
|
const range_iterator &end() { return ed; }
|
|
};
|
|
#endif |