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multidimensional-range.h
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multidimensional-range.h
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#pragma once
#include <array>
namespace viltrum {
template<std::size_t DIM>
class MultidimensionalRange {
std::array<std::size_t,DIM> min_;
std::array<std::size_t,DIM> max_;
friend class const_iterator;
public:
using value_type = std::array<std::size_t,DIM>;
constexpr std::size_t min(std::size_t i) const { return min_[i]; }
constexpr std::size_t max(std::size_t i) const { return max_[i]; }
constexpr std::size_t size() const {
std::size_t n = 1;
for (std::size_t i = 0; i<DIM; ++i) n*=(max(i)-min(i));
return n;
}
operator std::size_t() const { return size(); }
class const_iterator {
const MultidimensionalRange<DIM>& range;
std::array<std::size_t,DIM> a; bool ended;
public:
const_iterator(const MultidimensionalRange<DIM>& range, const std::array<std::size_t,DIM>& a) : range(range), a(a),ended(false) {}
const_iterator(const MultidimensionalRange<DIM>& range) : range(range), ended(true) {}
const std::array<std::size_t,DIM>& operator*() const { return a; }
const_iterator& operator++() {
for (std::size_t d = 0; d<DIM; ++d) {
++a[d];
if (a[d]>=range.max(d)) a[d] = range.min(d);
else return (*this);
}
ended = true; return (*this);
}
const_iterator operator++(int) {
const_iterator old = (*this);
++(*this);
return old;
}
bool operator==(const const_iterator& that) { return (this->ended == that.ended); }
bool operator!=(const const_iterator& that) { return (this->ended != that.ended); }
};
const_iterator begin() const { return const_iterator(*this, min_); }
const_iterator end() const { return const_iterator(*this); }
MultidimensionalRange(const std::array<std::size_t,DIM>& a, const std::array<std::size_t,DIM>& b) :
min_(a), max_(b) { }
};
template<std::size_t DIM>
MultidimensionalRange<DIM> multidimensional_range(const std::array<std::size_t,DIM>& a, const std::array<std::size_t,DIM>& b) {
return MultidimensionalRange<DIM>(a,b);
}
template<std::size_t DIM>
MultidimensionalRange<DIM> multidimensional_range(const std::array<std::size_t,DIM>& b) {
std::array<std::size_t,DIM> a; for (std::size_t d = 0; d<DIM; ++d) a[d]=0;
return multidimensional_range(a,b);
}
}