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100 wiersze
1.8 KiB
100 wiersze
1.8 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>
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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 operator T&()
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{
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return *data;
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}
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constexpr T& operator*(){
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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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return pointer_iterator{++data};
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}
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constexpr pointer_iterator operator++(int)
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{
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return pointer_iterator{data++};
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}
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constexpr pointer_iterator operator--()
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{
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return pointer_iterator{--data};
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}
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constexpr pointer_iterator operator--(int)
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{
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return pointer_iterator{data--};
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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+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+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-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-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;
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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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