array
parent
7444103897
commit
eaad38e588
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include/blt/unicode_emoji.h
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/*
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* <Short Description>
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_ARRAY_H
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#define BLT_ARRAY_H
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#include <type_traits>
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#include <blt/std/types.h>
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#include <blt/std/memory_util.h>
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#include <stdexcept>
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#include <iterator>
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namespace blt
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{
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template<typename T = void>
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class array
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{
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public:
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using iterator = blt::ptr_iterator<T>;
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using const_iterator = blt::ptr_iterator<const T>;
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using reverse_iterator = std::reverse_iterator<iterator>;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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private:
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struct metadata
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{
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// size in number of elements!
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blt::size_t size;
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explicit metadata(blt::size_t size): size(size)
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{}
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} metadata;
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T* _data = static_cast<T*>(static_cast<blt::u8*>(this) + sizeof(metadata));
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public:
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/**
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* constructs an array out of a block of memory of size bytes
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* @param size number of bytes available in the memory allocated to this array.
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*/
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explicit array(blt::size_t size): metadata( (size - sizeof(metadata)) / sizeof(T))
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{}
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inline T& operator[](blt::size_t index)
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{
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return _data[index];
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}
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inline const T& operator[](blt::size_t index) const
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{
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return _data[index];
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}
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[[nodiscard]] inline T& at(blt::size_t index)
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{
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if (index > size())
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throw std::runtime_error("Index " + std::to_string(index) += " is outside the bounds of this array!");
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return _data[index];
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}
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[[nodiscard]] inline const T& at(blt::size_t index) const
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{
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if (index > size())
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throw std::runtime_error("Index " + std::to_string(index) += " is outside the bounds of this array!");
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return _data[index];
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}
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[[nodiscard]] inline T* data()
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{
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return _data;
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}
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[[nodiscard]] inline T* data() const
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{
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return _data;
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}
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[[nodiscard]] inline blt::size_t size() const
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{
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return metadata.size;
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}
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[[nodiscard]] inline blt::size_t size_bytes() const
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{
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return (metadata.size * sizeof(T)) + sizeof(metadata);
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}
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constexpr inline T* operator*()
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{
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return _data;
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}
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constexpr inline T& front()
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{
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return *_data;
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}
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constexpr inline const T& front() const
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{
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return *_data;
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}
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constexpr inline T& back()
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{
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return _data[size() - 1];
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}
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constexpr inline const T& back() const
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{
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return _data[size() - 1];
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}
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constexpr inline iterator begin() const noexcept
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{
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return data();
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}
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constexpr inline iterator end() const noexcept
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{
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return data() + size();
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}
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constexpr inline const_iterator cbegin() const noexcept
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{
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return data();
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}
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constexpr inline const_iterator cend() const noexcept
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{
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return data() + size();
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}
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constexpr inline reverse_iterator rbegin() const noexcept
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{
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return reverse_iterator{end()};
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}
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constexpr inline reverse_iterator rend() const noexcept
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{
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return reverse_iterator{begin()};
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}
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constexpr inline const_iterator crbegin() const noexcept
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{
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return const_reverse_iterator{cend()};
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}
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constexpr inline reverse_iterator crend() const noexcept
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{
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return reverse_iterator{cbegin()};
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}
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};
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}
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#endif //BLT_ARRAY_H
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namespace blt
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{
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template<typename V>
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struct ptr_iterator
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{
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public:
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using iterator_category = std::random_access_iterator_tag;
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using difference_type = std::ptrdiff_t;
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using value_type = V;
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using pointer = value_type*;
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using reference = value_type&;
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explicit ptr_iterator(V* v): _v(v)
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{}
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reference operator*() const
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{ return *_v; }
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pointer operator->()
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{ return _v; }
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ptr_iterator& operator++()
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{
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_v++;
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return *this;
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}
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ptr_iterator& operator--()
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{
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_v--;
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return *this;
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}
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ptr_iterator operator++(int)
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{
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auto tmp = *this;
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++(*this);
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return tmp;
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}
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ptr_iterator operator--(int)
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{
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auto tmp = *this;
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--(*this);
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return tmp;
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}
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friend bool operator==(const ptr_iterator& a, const ptr_iterator& b)
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{
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return a._v == b._v;
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}
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friend bool operator!=(const ptr_iterator& a, const ptr_iterator& b)
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{
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return a._v != b._v;
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}
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private:
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V* _v;
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};
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template<typename T, bool = std::is_copy_constructible_v<T> || std::is_copy_assignable_v<T>>
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class scoped_buffer;
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#if defined(__clang__) || defined(__llvm__) || defined(__GNUC__) || defined(__GNUG__)
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#if defined(__GNUC__) || defined(__GNUG__)
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#include <byteswap.h>
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#define SWAP16(val) bswap_16(val)
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std::memcpy(&r, &type, sizeof(type));
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return r;
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}
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}
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namespace blt
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{
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template<typename V>
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struct ptr_iterator
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{
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public:
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using iterator_category = std::random_access_iterator_tag;
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using difference_type = std::ptrdiff_t;
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using value_type = V;
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using pointer = value_type*;
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using reference = value_type&;
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explicit ptr_iterator(V* v): _v(v)
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{}
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reference operator*() const
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{ return *_v; }
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pointer operator->()
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{ return _v; }
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ptr_iterator& operator++()
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{
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_v++;
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return *this;
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}
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ptr_iterator& operator--()
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{
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_v--;
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return *this;
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}
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ptr_iterator operator++(int)
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{
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auto tmp = *this;
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++(*this);
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return tmp;
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}
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ptr_iterator operator--(int)
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{
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auto tmp = *this;
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--(*this);
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return tmp;
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}
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friend bool operator==(const ptr_iterator& a, const ptr_iterator& b)
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{
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return a._v == b._v;
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}
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friend bool operator!=(const ptr_iterator& a, const ptr_iterator& b)
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{
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return a._v != b._v;
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}
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private:
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V* _v;
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};
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}
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#endif //BLT_MEMORY_UTIL_H
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return buffer_;
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}
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constexpr inline iterator begin() noexcept
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constexpr inline iterator begin() const noexcept
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{
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return data();
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}
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constexpr inline iterator end() noexcept
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constexpr inline iterator end() const noexcept
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{
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return data() + size();
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}
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return data() + size();
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}
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constexpr inline reverse_iterator rbegin() noexcept
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constexpr inline reverse_iterator rbegin() const noexcept
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{
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return reverse_iterator{end()};
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}
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constexpr inline reverse_iterator rend() noexcept
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constexpr inline reverse_iterator rend() const noexcept
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{
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return reverse_iterator{begin()};
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}
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