forked from OctaForge/libostd
423 lines
11 KiB
C++
423 lines
11 KiB
C++
/* Ranges for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OCTA_RANGE_H
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#define OCTA_RANGE_H
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#include <stddef.h>
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#include "octa/types.h"
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#include "octa/utility.h"
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#include "octa/type_traits.h"
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namespace octa {
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struct InputRangeTag {};
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struct OutputRangeTag {};
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struct ForwardRangeTag {};
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struct BidirectionalRangeTag {};
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struct RandomAccessRangeTag {};
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template<typename T> using RangeCategory = typename T::Category;
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template<typename T> using RangeSize = typename T::SizeType;
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template<typename T> using RangeValue = typename T::ValType;
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template<typename T> using RangeReference = typename T::RefType;
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template<typename T>
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struct __OctaRangeIterator {
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__OctaRangeIterator(): p_range() {}
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explicit __OctaRangeIterator(const T &range): p_range(range) {}
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__OctaRangeIterator &operator++() {
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p_range.pop_first();
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return *this;
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}
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RangeReference<T> operator*() {
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return p_range.first();
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}
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RangeReference<T> operator*() const {
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return p_range.first();
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}
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bool operator!=(__OctaRangeIterator) const { return !p_range.empty(); }
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private:
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T p_range;
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};
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template<typename B, typename C, typename V, typename R = V &,
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typename S = size_t
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> struct InputRange {
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typedef C Category;
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typedef S SizeType;
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typedef V ValType;
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typedef R RefType;
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__OctaRangeIterator<B> begin() {
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return __OctaRangeIterator<B>((const B &)*this);
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}
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__OctaRangeIterator<B> end() {
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return __OctaRangeIterator<B>();
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}
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};
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template<typename V, typename R = V &, typename S = size_t>
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struct OutputRange {
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typedef OutputRangeTag Category;
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typedef S SizeType;
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typedef V ValType;
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typedef R RefType;
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};
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template<typename T>
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struct ReverseRange: InputRange<ReverseRange<T>,
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RangeCategory<T>, RangeValue<T>, RangeReference<T>, RangeSize<T>
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> {
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private:
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typedef RangeReference<T> r_ref;
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typedef RangeSize<T> r_size;
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T p_range;
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public:
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ReverseRange(): p_range() {}
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ReverseRange(const T &range): p_range(range) {}
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ReverseRange(const ReverseRange &it): p_range(it.p_range) {}
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ReverseRange(ReverseRange &&it): p_range(move(it.p_range)) {}
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ReverseRange &operator=(const ReverseRange &v) {
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p_range = v.p_range;
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return *this;
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}
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ReverseRange &operator=(ReverseRange &&v) {
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p_range = move(v.p_range);
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return *this;
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}
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ReverseRange &operator=(const T &v) {
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p_range = v;
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return *this;
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}
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ReverseRange &operator=(T &&v) {
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p_range = move(v);
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return *this;
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}
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bool empty() const {
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return p_range.empty();
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}
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r_size length() const {
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return p_range.length();
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}
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void pop_first() {
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p_range.pop_last();
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}
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void pop_last() {
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p_range.pop_first();
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}
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bool operator==(const ReverseRange &v) const {
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return p_range == v.p_range;
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}
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bool operator!=(const ReverseRange &v) const {
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return p_range != v.p_range;
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}
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r_ref first() {
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return p_range.last();
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}
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r_ref first() const {
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return p_range.last();
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}
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r_ref last() {
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return p_range.first();
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}
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r_ref last() const {
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return p_range.first();
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}
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r_ref operator[](r_size i) {
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return p_range[length() - i - 1];
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}
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r_ref operator[](r_size i) const {
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return p_range[length() - i - 1];
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}
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ReverseRange<T> slice(r_size start, r_size end) {
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r_size len = p_range.length();
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return ReverseRange<T>(p_range.slice(len - end, len - start));
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}
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};
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template<typename T>
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ReverseRange<T> make_reverse_range(const T &it) {
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return ReverseRange<T>(it);
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}
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template<typename T>
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struct MoveRange: InputRange<MoveRange<T>,
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RangeCategory<T>, RangeValue<T>, RangeValue<T> &&, RangeSize<T>
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> {
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private:
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typedef RangeValue<T> r_val;
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typedef RangeValue<T> &&r_ref;
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typedef RangeSize<T> r_size;
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T p_range;
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public:
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MoveRange(): p_range() {}
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MoveRange(const T &range): p_range(range) {}
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MoveRange(const MoveRange &it): p_range(it.p_range) {}
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MoveRange(MoveRange &&it): p_range(move(it.p_range)) {}
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MoveRange &operator=(const MoveRange &v) {
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p_range = v.p_range;
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return *this;
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}
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MoveRange &operator=(MoveRange &&v) {
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p_range = move(v.p_range);
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return *this;
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}
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MoveRange &operator=(const T &v) {
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p_range = v;
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return *this;
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}
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MoveRange &operator=(T &&v) {
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p_range = move(v);
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return *this;
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}
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bool empty() const {
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return p_range.empty();
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}
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r_size length() const {
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return p_range.length();
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}
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void pop_first() {
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p_range.pop_first();
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}
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void pop_last() {
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p_range.pop_last();
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}
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bool operator==(const MoveRange &v) const {
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return p_range == v.p_range;
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}
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bool operator!=(const MoveRange &v) const {
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return p_range != v.p_range;
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}
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r_ref first() {
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return move(p_range.first());
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}
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r_ref last() {
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return move(p_range.last());
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}
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r_ref operator[](r_size i) {
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return move(p_range[i]);
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}
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MoveRange<T> slice(r_size start, r_size end) {
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return MoveRange<T>(p_range.slice(start, end));
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}
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void put(const r_val &v) {
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p_range.put(v);
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}
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void put(r_val &&v) {
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p_range.put(move(v));
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}
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};
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template<typename T>
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MoveRange<T> make_move_range(const T &it) {
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return MoveRange<T>(it);
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}
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template<typename T>
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struct NumberRange: InputRange<NumberRange<T>, ForwardRangeTag, T> {
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NumberRange(): p_a(0), p_b(0), p_step(0) {}
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NumberRange(const NumberRange &it): p_a(it.p_a), p_b(it.p_b),
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p_step(it.p_step) {}
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NumberRange(T a, T b, T step = T(1)): p_a(a), p_b(b),
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p_step(step) {}
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NumberRange(T v): p_a(0), p_b(v), p_step(1) {}
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bool operator==(const NumberRange &v) const {
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return p_a == v.p_a && p_b == v.p_b && p_step == v.p_step;
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}
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bool operator!=(const NumberRange &v) const {
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return p_a != v.p_a || p_b != v.p_b || p_step != v.p_step;
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}
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bool empty() const { return p_a * p_step >= p_b * p_step; }
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void pop_first() { p_a += p_step; }
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T &first() { return p_a; }
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private:
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T p_a, p_b, p_step;
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};
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template<typename T>
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NumberRange<T> range(T a, T b, T step = T(1)) {
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return NumberRange<T>(a, b, step);
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}
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template<typename T>
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NumberRange<T> range(T v) {
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return NumberRange<T>(v);
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}
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template<typename T>
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struct PointerRange: InputRange<PointerRange<T>, RandomAccessRangeTag, T> {
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PointerRange(): p_beg(nullptr), p_end(nullptr) {}
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PointerRange(const PointerRange &v): p_beg(v.p_beg),
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p_end(v.p_end) {}
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PointerRange(T *beg, T *end): p_beg(beg), p_end(end) {}
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PointerRange(T *beg, size_t n): p_beg(beg), p_end(beg + n) {}
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PointerRange &operator=(const PointerRange &v) {
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p_beg = v.p_beg;
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p_end = v.p_end;
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return *this;
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}
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bool operator==(const PointerRange &v) const {
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return p_beg == v.p_beg && p_end == v.p_end;
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}
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bool operator!=(const PointerRange &v) const {
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return p_beg != v.p_beg || p_end != v.p_end;
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}
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/* satisfy InputRange / ForwardRange */
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bool empty() const { return p_beg == nullptr; }
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void pop_first() {
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if (p_beg == nullptr) return;
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if (++p_beg == p_end) p_beg = p_end = nullptr;
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}
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T &first() { return *p_beg; }
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const T &first() const { return *p_beg; }
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/* satisfy BidirectionalRange */
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void pop_last() {
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if (p_end-- == p_beg) { p_end = nullptr; return; }
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if (p_end == p_beg) p_beg = p_end = nullptr;
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}
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T &last() { return *(p_end - 1); }
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const T &last() const { return *(p_end - 1); }
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/* satisfy RandomAccessRange */
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size_t length() const { return p_end - p_beg; }
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PointerRange slice(size_t start, size_t end) {
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return PointerRange(p_beg + start, p_beg + end);
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}
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T &operator[](size_t i) { return p_beg[i]; }
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const T &operator[](size_t i) const { return p_beg[i]; }
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/* satisfy OutputRange */
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void put(const T &v) {
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*(p_beg++) = v;
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}
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void put(T &&v) {
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*(p_beg++) = move(v);
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}
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private:
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T *p_beg, *p_end;
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};
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template<typename T, typename S>
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struct EnumeratedValue {
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S index;
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T value;
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};
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template<typename T>
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struct EnumeratedRange: InputRange<EnumeratedRange<T>,
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InputRangeTag, RangeValue<T>,
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EnumeratedValue<RangeReference<T>, RangeSize<T>>,
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RangeSize<T>
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> {
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private:
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typedef RangeReference<T> r_ref;
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typedef RangeSize<T> r_size;
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T p_range;
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r_size p_index;
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public:
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EnumeratedRange(): p_range(), p_index(0) {}
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EnumeratedRange(const T &range): p_range(range), p_index(0) {}
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EnumeratedRange(const EnumeratedRange &it):
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p_range(it.p_range), p_index(it.p_index) {}
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EnumeratedRange(EnumeratedRange &&it):
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p_range(move(it.p_range)), p_index(it.p_index) {}
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EnumeratedRange &operator=(const EnumeratedRange &v) {
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p_range = v.p_range;
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p_index = v.p_index;
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return *this;
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}
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EnumeratedRange &operator=(EnumeratedRange &&v) {
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p_range = move(v.p_range);
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p_index = v.p_index;
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return *this;
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}
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EnumeratedRange &operator=(const T &v) {
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p_range = v;
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p_index = 0;
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return *this;
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}
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EnumeratedRange &operator=(T &&v) {
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p_range = move(v);
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p_index = 0;
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return *this;
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}
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bool empty() const {
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return p_range.empty();
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}
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void pop_first() {
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++p_index; p_range.pop_first();
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}
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EnumeratedValue<r_ref, r_size> first() {
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return EnumeratedValue<r_ref, r_size> { p_index, p_range.first() };
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}
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EnumeratedValue<r_ref, r_size> first() const {
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return EnumeratedValue<r_ref, r_size> { p_index, p_range.first() };
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}
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bool operator==(const EnumeratedRange &v) const {
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return p_range == v.p_range;
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}
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bool operator!=(const EnumeratedRange &v) const {
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return p_range != v.p_range;
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}
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};
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template<typename T>
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EnumeratedRange<T> enumerate(const T &it) {
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return EnumeratedRange<T>(it);
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}
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}
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#endif |