608 lines
19 KiB
C++
608 lines
19 KiB
C++
/*
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* Created by Brett on 08/02/23.
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* Licensed under GNU General Public License V3.0
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* See LICENSE file for license detail
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*/
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#ifndef BLT_TESTS_MEMORY_H
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#define BLT_TESTS_MEMORY_H
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#include <blt/std/memory_util.h>
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#include <initializer_list>
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#include <iterator>
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#include <cstring>
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#include "queue.h"
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#include "utility.h"
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#include <blt/std/assert.h>
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#include <cstdint>
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#include <type_traits>
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#include <utility>
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#include <cstring>
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namespace blt
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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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/**
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* Creates an encapsulation of a T array which will be automatically deleted when this object goes out of scope.
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* This is a simple buffer meant to be used only inside of a function and not copied around.
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* The internal buffer is allocated on the heap.
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* The operator * has been overloaded to return the internal buffer.
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* @tparam T type that is stored in buffer eg char
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*/
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template<typename T>
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class scoped_buffer<T, true>
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{
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public:
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using element_type = T;
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using value_type = std::remove_cv_t<T>;
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using pointer = T*;
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using const_pointer = const T*;
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using reference = T&;
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using const_reference = const T&;
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using iterator = ptr_iterator<T>;
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using const_iterator = 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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T* buffer_ = nullptr;
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size_t size_;
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public:
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constexpr scoped_buffer(): buffer_(nullptr), size_(0)
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{}
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constexpr explicit scoped_buffer(size_t size): size_(size)
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{
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if (size > 0)
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buffer_ = new T[size];
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else
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buffer_ = nullptr;
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}
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constexpr scoped_buffer(const scoped_buffer& copy)
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{
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if (copy.size() == 0)
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{
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buffer_ = nullptr;
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size_ = 0;
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return;
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}
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buffer_ = new T[copy.size()];
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size_ = copy.size_;
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if constexpr (std::is_trivially_copyable_v<T>)
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{
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std::memcpy(buffer_, copy.buffer_, copy.size() * sizeof(T));
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} else
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{
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if constexpr (std::is_copy_constructible_v<T> && !std::is_copy_assignable_v<T>)
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{
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for (size_t i = 0; i < this->size_; i++)
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buffer_[i] = T(copy[i]);
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} else
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for (size_t i = 0; i < this->size_; i++)
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buffer_[i] = copy[i];
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}
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}
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constexpr scoped_buffer& operator=(const scoped_buffer& copy)
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{
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if (© == this)
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return *this;
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if (copy.size() == 0)
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{
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buffer_ = nullptr;
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size_ = 0;
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return *this;
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}
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delete[] this->buffer_;
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buffer_ = new T[copy.size()];
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size_ = copy.size_;
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if constexpr (std::is_trivially_copyable_v<T>)
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{
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std::memcpy(buffer_, copy.buffer_, copy.size() * sizeof(T));
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} else
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{
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if constexpr (std::is_copy_constructible_v<T> && !std::is_copy_assignable_v<T>)
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{
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for (size_t i = 0; i < this->size_; i++)
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buffer_[i] = T(copy[i]);
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} else
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for (size_t i = 0; i < this->size_; i++)
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buffer_[i] = copy[i];
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}
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return *this;
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}
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constexpr scoped_buffer(scoped_buffer&& move) noexcept
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{
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delete[] buffer_;
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buffer_ = move.buffer_;
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size_ = move.size();
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move.buffer_ = nullptr;
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}
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constexpr scoped_buffer& operator=(scoped_buffer&& moveAssignment) noexcept
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{
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delete[] buffer_;
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buffer_ = moveAssignment.buffer_;
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size_ = moveAssignment.size();
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moveAssignment.buffer_ = nullptr;
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return *this;
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}
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/**
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* Resize the internal buffer. Nothing will occur if the sizes are equal.
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* This function WILL NOT COPY ANY DATA. It is meant for use when creating a scoped buffer without size.
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*/
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constexpr void resize(size_t size)
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{
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if (size == 0)
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return;
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if (size == size_)
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return;
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delete[] buffer_;
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buffer_ = new T[size];
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size_ = size;
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}
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constexpr inline T& operator[](size_t index)
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{
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return buffer_[index];
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}
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constexpr inline const T& operator[](size_t index) const
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{
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return buffer_[index];
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}
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constexpr inline T* operator*()
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{
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return buffer_;
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}
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[[nodiscard]] constexpr inline size_t size() const
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{
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return size_;
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}
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constexpr inline T*& ptr()
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{
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return buffer_;
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}
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constexpr inline const T* const& ptr() const
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{
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return buffer_;
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}
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constexpr inline const T* const& data() const
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{
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return buffer_;
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}
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constexpr inline T*& data()
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{
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return buffer_;
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}
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constexpr iterator begin() noexcept
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{
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return iterator{data()};
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}
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constexpr iterator end() noexcept
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{
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return iterator{data() + size()};
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}
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constexpr const_iterator cbegin() const noexcept
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{
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return const_iterator{data()};
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}
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constexpr const_iterator cend() const noexcept
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{
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return const_iterator{data() + size()};
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}
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constexpr inline reverse_iterator rbegin() 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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{
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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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~scoped_buffer()
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{
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delete[] buffer_;
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}
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};
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template<typename T>
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class scoped_buffer<T, false> : scoped_buffer<T, true>
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{
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using scoped_buffer<T, true>::scoped_buffer;
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public:
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scoped_buffer(const scoped_buffer& copy) = delete;
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scoped_buffer operator=(scoped_buffer& copyAssignment) = delete;
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};
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// TODO: might already have a version of this somewhere!
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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 expanding_buffer;
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template<typename T>
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class expanding_buffer<T, true>
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{
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public:
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using element_type = T;
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using value_type = std::remove_cv_t<T>;
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using pointer = T*;
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using const_pointer = const T*;
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using reference = T&;
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using const_reference = const T&;
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using iterator = ptr_iterator<T>;
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using const_iterator = 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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T* buffer_ = nullptr;
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size_t size_;
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public:
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constexpr expanding_buffer(): buffer_(nullptr), size_(0)
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{}
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constexpr explicit expanding_buffer(size_t size): size_(size)
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{
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if (size > 0)
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buffer_ = new T[size];
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else
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buffer_ = nullptr;
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}
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constexpr expanding_buffer(const expanding_buffer& copy)
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{
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if (copy.size() == 0)
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{
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buffer_ = nullptr;
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size_ = 0;
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return;
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}
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buffer_ = new T[copy.size()];
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size_ = copy.size_;
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if constexpr (std::is_trivially_copyable_v<T>)
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{
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std::memcpy(buffer_, copy.buffer_, copy.size() * sizeof(T));
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} else
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{
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if constexpr (std::is_copy_constructible_v<T> && !std::is_copy_assignable_v<T>)
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{
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for (size_t i = 0; i < this->size_; i++)
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buffer_[i] = T(copy[i]);
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} else
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for (size_t i = 0; i < this->size_; i++)
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buffer_[i] = copy[i];
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}
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}
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constexpr expanding_buffer& operator=(const expanding_buffer& copy)
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{
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if (© == this)
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return *this;
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if (copy.size() == 0)
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{
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buffer_ = nullptr;
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size_ = 0;
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return *this;
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}
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delete_this(buffer_, size());
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buffer_ = new T[copy.size()];
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size_ = copy.size_;
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if constexpr (std::is_trivially_copyable_v<T>)
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{
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std::memcpy(buffer_, copy.buffer_, copy.size() * sizeof(T));
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} else
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{
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if constexpr (std::is_copy_constructible_v<T> && !std::is_copy_assignable_v<T>)
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{
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for (size_t i = 0; i < this->size_; i++)
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buffer_[i] = T(copy[i]);
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} else
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for (size_t i = 0; i < this->size_; i++)
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buffer_[i] = copy[i];
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}
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return *this;
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}
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constexpr expanding_buffer(expanding_buffer&& move) noexcept
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{
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delete_this(buffer_, size());
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buffer_ = move.buffer_;
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size_ = move.size();
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move.buffer_ = nullptr;
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}
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constexpr expanding_buffer& operator=(expanding_buffer&& moveAssignment) noexcept
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{
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delete_this(buffer_, size());
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buffer_ = moveAssignment.buffer_;
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size_ = moveAssignment.size();
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moveAssignment.buffer_ = nullptr;
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return *this;
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}
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/**
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* Resize the internal buffer. Nothing will occur if the sizes are equal.
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* This function WILL NOT COPY ANY DATA. It is meant for use when creating a scoped buffer without size.
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*/
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constexpr void resize(size_t size)
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{
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if (size == 0)
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return;
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if (size == size_)
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return;
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delete_this(buffer_, this->size());
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buffer_ = new T[size];
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size_ = size;
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}
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constexpr inline T& operator[](size_t index)
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{
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if (index >= size())
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expand(index);
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return buffer_[index];
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}
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constexpr inline const T& operator[](size_t index) const
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{
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if (index >= size())
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expand(index);
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return buffer_[index];
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}
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constexpr inline T* operator*()
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{
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return buffer_;
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}
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[[nodiscard]] constexpr inline size_t size() const
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{
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return size_;
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}
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constexpr inline T*& ptr()
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{
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return buffer_;
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}
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constexpr inline const T* const& ptr() const
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{
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return buffer_;
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}
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constexpr inline const T* const& data() const
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{
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return buffer_;
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}
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constexpr inline T*& data()
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{
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return buffer_;
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}
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constexpr iterator begin() noexcept
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{
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return iterator{data()};
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}
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constexpr iterator end() noexcept
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{
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return iterator{data() + size()};
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}
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constexpr const_iterator cbegin() const noexcept
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{
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return const_iterator{data()};
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}
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constexpr const_iterator cend() const noexcept
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{
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return const_iterator{data() + size()};
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}
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constexpr inline reverse_iterator rbegin() 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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{
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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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~expanding_buffer()
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{
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delete_this(buffer_, size());
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}
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private:
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void expand(blt::size_t size)
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{
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size = std::max(this->size(), size);
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T* new_buffer = new T[blt::mem::next_byte_allocation(size)];
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if constexpr (std::is_trivially_copyable_v<T>)
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{
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std::memcpy(new_buffer, buffer_, size * sizeof(T));
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} else
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{
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if constexpr (std::is_copy_constructible_v<T> && !std::is_move_constructible_v<T>)
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{
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for (size_t i = 0; i < size; i++)
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new_buffer[i] = T(buffer_[i]);
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} else
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for (size_t i = 0; i < size; i++)
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new_buffer[i] = std::move(buffer_[i]);
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}
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delete[] buffer_;
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buffer_ = new_buffer;
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}
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inline void delete_this(T* buffer, blt::size_t)
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{
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// if constexpr (std::is_trivially_destructible_v<T>)
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// return;
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// if (buffer == nullptr)
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// return;
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// for (blt::size_t i = 0; i < size; i++)
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// buffer[i]->~T();
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// free(buffer);
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delete[] buffer;
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}
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};
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template<typename T>
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class expanding_buffer<T, false> : expanding_buffer<T, true>
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{
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using expanding_buffer<T, true>::expanding_buffer;
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public:
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expanding_buffer(const expanding_buffer& copy) = delete;
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expanding_buffer operator=(expanding_buffer& copyAssignment) = delete;
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};
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template<typename T>
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struct nullptr_initializer
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{
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private:
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T* m_ptr = nullptr;
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public:
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nullptr_initializer() = default;
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explicit nullptr_initializer(T* ptr): m_ptr(ptr)
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{}
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nullptr_initializer(const nullptr_initializer<T>& ptr): m_ptr(ptr.m_ptr)
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{}
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nullptr_initializer(nullptr_initializer<T>&& ptr) noexcept: m_ptr(ptr.m_ptr)
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{}
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nullptr_initializer<T>& operator=(const nullptr_initializer<T>& ptr)
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{
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if (&ptr == this)
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return *this;
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this->m_ptr = ptr.m_ptr;
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return *this;
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}
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nullptr_initializer<T>& operator=(nullptr_initializer<T>&& ptr) noexcept
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{
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if (&ptr == this)
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return *this;
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this->m_ptr = ptr.m_ptr;
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return *this;
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}
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inline T* operator->()
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{
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return m_ptr;
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}
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~nullptr_initializer() = default;
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};
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/**
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* Creates a hash-map like association between an enum key and any arbitrary value.
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* The storage is backed by a contiguous array for faster access.
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* @tparam K enum value
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* @tparam V associated value
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*/
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template<typename K, typename V>
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class enum_storage
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{
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private:
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V* m_values;
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size_t m_size = 0;
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public:
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enum_storage(std::initializer_list<std::pair<K, V>> init)
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{
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for (auto& i : init)
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m_size = std::max((size_t) i.first, m_size);
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m_values = new V[m_size];
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for (auto& v : init)
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m_values[(size_t) v.first] = v.second;
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}
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inline V& operator[](size_t index)
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{
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return m_values[index];
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}
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inline const V& operator[](size_t index) const
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{
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return m_values[index];
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}
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[[nodiscard]] inline size_t size() const
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{
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return m_size;
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}
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ptr_iterator<V> begin()
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{
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return ptr_iterator{m_values};
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}
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ptr_iterator<V> end()
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{
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return ptr_iterator{&m_values[m_size]};
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}
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~enum_storage()
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{
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delete[] m_values;
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}
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};
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}
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#endif //BLT_TESTS_MEMORY_H
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