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205 líneas
3.9 KiB
205 líneas
3.9 KiB
#pragma once
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#include <cstddef>
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#include <cstdint>
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#include <gp/optional.hpp>
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#include <gp/iterator.hpp>
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#include <gp/function.hpp>
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#include <gp/exception.hpp>
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#include <gp/algorithm/move.hpp>
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namespace gp{
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template<typename T>
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class buffer final{
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public:
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struct buffer_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 buffer_iterator(const buffer_iterator& oth)
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: data{oth.data}
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{}
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constexpr buffer_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 buffer_iterator operator++()
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{
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return buffer_iterator{++data};
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}
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constexpr buffer_iterator operator++(int)
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{
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return buffer_iterator{data++};
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}
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constexpr buffer_iterator operator--()
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{
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return buffer_iterator{--data};
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}
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constexpr buffer_iterator operator--(int)
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{
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return buffer_iterator{data--};
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}
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constexpr buffer_iterator operator+(const std::size_t offset)
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{
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return buffer_iterator{data+offset};
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}
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constexpr buffer_iterator operator+(const int offset)
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{
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return buffer_iterator{data+offset};
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}
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constexpr buffer_iterator operator-(const std::size_t offset)
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{
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return buffer_iterator{data-offset};
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}
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constexpr buffer_iterator operator-(const int offset)
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{
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return buffer_iterator{data-offset};
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}
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constexpr difference_type operator-(const buffer_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 buffer_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!=(buffer_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 buffer_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 buffer_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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private:
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buffer_iterator begin_elem;
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buffer_iterator end_elem;
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public:
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using associated_iterator = buffer_iterator;
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constexpr buffer(T* beg_ptr, T* end_ptr)
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: begin_elem{beg_ptr}
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, end_elem{end_ptr}
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{}
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constexpr buffer(T* beg_ptr, std::size_t sz)
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: begin_elem{beg_ptr}
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, end_elem{beg_ptr+sz}
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{}
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constexpr typename buffer_iterator::difference_type size() const
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{
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return end_elem - begin_elem;
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}
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constexpr associated_iterator begin() const
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{
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return begin_elem;
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}
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constexpr associated_iterator end() const
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{
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return end_elem;
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}
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constexpr T& operator[](std::size_t offset)
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{
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return *(begin_elem+offset);
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}
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optional<buffer_iterator> at(std::size_t offset)
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{
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auto elem = begin()+offset;
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if(!contains(elem))
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{
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return nullopt;
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}
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return elem;
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}
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constexpr bool contains(buffer_iterator ptr)
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{
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return
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ptr.data < end_elem.data
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&& ptr.data >= begin_elem.data;
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}
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template<typename U>
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buffer<U> cast()
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{
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if constexpr(sizeof(T)%sizeof(U) == 0)
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{
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return buffer<U>(reinterpret_cast<U*>(&*begin_elem), size()*(sizeof(T)/sizeof(U)));
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}
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else
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{
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if(size()*sizeof(T)/sizeof(U))
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{
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return buffer<U>(reinterpret_cast<U*>(&*begin_elem), size()*sizeof(T)/sizeof(U));
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}
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else if constexpr (gp_config::has_exceptions)
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{
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throw bad_buffer_cast<T, U>{};
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}
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else
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{
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return buffer<U>(reinterpret_cast<U*>(nullptr), 0);
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}
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}
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}
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buffer slice_start(size_t new_sz)
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{
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if(new_sz<=size())
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{
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return buffer{&*begin(), &*(begin()+new_sz)};
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}
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else
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{
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return buffer{(T*)nullptr,(size_t)0};
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}
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}
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buffer slice_end(size_t new_sz)
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{
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if(new_sz<=size())
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{
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return buffer{&*(end()-(1+new_sz)), &*end()};
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}
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else
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{
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return buffer{(T*)nullptr,(size_t)0};
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}
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}
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};
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}
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