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195 строки
3.8 KiB
195 строки
3.8 KiB
#pragma once
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#include <stddef.h>
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#include <stdint.h>
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enum class iterator_type_t{
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contiguous_iterator,
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non_contiguous_iterator,
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lazy_iterator
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};
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template<typename T, int sign = 1>
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struct pointer_iterator final
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{
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T* data;
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typedef T value_type;
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typedef std::size_t difference_type;
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static constexpr iterator_type_t iterator_type = iterator_type_t::contiguous_iterator;
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constexpr pointer_iterator(const pointer_iterator& oth)
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: data{oth.data}
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{}
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constexpr pointer_iterator(T* ptr)
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: data{ptr}
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{}
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constexpr T& operator*()
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{
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return *data;
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}
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constexpr pointer_iterator& operator++()
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{
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data += sign;
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return *this;
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}
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constexpr pointer_iterator operator++(int)
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{
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auto p = *this;
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data += sign;
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return p;
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}
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constexpr pointer_iterator& operator--()
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{
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data -= sign;
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return *this;
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}
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constexpr pointer_iterator operator--(int)
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{
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auto p = *this;
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data -= sign;
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return p;
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}
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constexpr pointer_iterator operator+(const std::size_t offset)
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{
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return pointer_iterator{data+sign*offset};
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}
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constexpr pointer_iterator operator+(const int offset)
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{
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return pointer_iterator{data+sign*offset};
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}
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constexpr pointer_iterator operator-(const std::size_t offset)
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{
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return pointer_iterator{data-sign*offset};
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}
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constexpr pointer_iterator operator-(const int offset)
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{
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return pointer_iterator{data-sign*offset};
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}
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constexpr difference_type operator-(const pointer_iterator& oth) const
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{
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return ((T*)data-(T*)oth.data)*sign;
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}
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constexpr bool operator==(const pointer_iterator oth)
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{
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return data==oth.data;
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}
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constexpr bool operator!=(pointer_iterator oth)
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{
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return data!=oth.data;
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}
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constexpr bool before_or_equal(const pointer_iterator oth)
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{
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return reinterpret_cast<std::intptr_t>(data) <= reinterpret_cast<std::intptr_t>(oth.data);
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}
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constexpr bool operator<=(const pointer_iterator oth)
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{
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return before_or_equal(oth);
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}
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};
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template<typename T, int sign = 1>
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struct const_pointer_iterator final
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{
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const T* data;
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typedef T value_type;
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typedef std::size_t difference_type;
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static constexpr iterator_type_t iterator_type = iterator_type_t::contiguous_iterator;
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constexpr const_pointer_iterator(const const_pointer_iterator& oth)
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: data{oth.data}
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{}
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constexpr const_pointer_iterator(const T* ptr)
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: data{ptr}
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{}
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constexpr const T& operator*()
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{
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return *data;
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}
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constexpr const_pointer_iterator& operator++()
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{
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data += sign;
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return *this;
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}
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constexpr const_pointer_iterator operator++(int)
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{
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auto p = data;
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data += sign;
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return const_pointer_iterator{p};
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}
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constexpr const_pointer_iterator& operator--()
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{
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data -= sign;
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return *this;
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}
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constexpr const_pointer_iterator operator--(int)
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{
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auto p = data;
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data -= sign;
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return const_pointer_iterator{p};
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}
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constexpr const_pointer_iterator operator+(const std::size_t offset)
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{
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return const_pointer_iterator{data+sign*offset};
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}
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constexpr const_pointer_iterator operator+(const int offset)
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{
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return const_pointer_iterator{data+sign*offset};
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}
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constexpr const_pointer_iterator operator-(const std::size_t offset)
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{
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return const_pointer_iterator{data-sign*offset};
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}
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constexpr const_pointer_iterator operator-(const int offset)
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{
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return const_pointer_iterator{data-sign*offset};
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}
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constexpr difference_type operator-(const const_pointer_iterator& oth) const
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{
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return ((T*)data-(T*)oth.data)*sign;
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}
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constexpr bool operator==(const const_pointer_iterator oth)
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{
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return data==oth.data;
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}
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constexpr bool operator!=(const_pointer_iterator oth)
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{
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return data!=oth.data;
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}
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constexpr bool before_or_equal(const const_pointer_iterator oth)
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{
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return reinterpret_cast<std::intptr_t>(data) <= reinterpret_cast<std::intptr_t>(oth.data);
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}
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constexpr bool operator<=(const const_pointer_iterator oth)
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{
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return before_or_equal(oth);
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}
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};
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