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371 рядки
7.9 KiB
371 рядки
7.9 KiB
#pragma once
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#include <gp/containers/buffer.hpp>
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#include <gp/utils/allocators/allocator.hpp>
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#include <initializer_list>
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namespace gp{
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/**
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* @brief A vector type most similar to that of the standard library
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* Always uses polymorphic allocation, no small value optimization
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*
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* @tparam T
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*/
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template<typename T>
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class vector final {
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T* ary = nullptr; //< The data
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size_t sz = 0; //< the used size of the array
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size_t cap = 0; //< the available capacity of the array
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gp::reference_wrapper<allocator> alloc; //< the allocator
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public:
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using associated_iterator = pointer_iterator<T, 1>;
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using associated_const_iterator = const_pointer_iterator<T, 1>;
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using associated_riterator = pointer_iterator<T, -1>;
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using associated_const_riterator = const_pointer_iterator<T, -1>;
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/**
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* @brief Construct a new vector object from an allocator
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*
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* @param v the allocator
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*/
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vector(allocator& v)
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: ary()
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, alloc(v)
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{}
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/**
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* @brief Construct a new vector object from another vector, copying it
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*
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* @param oth the other vector
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*/
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vector(vector& oth)
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: alloc(oth.alloc)
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{
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sz = 0;
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cap = 0;
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ary = nullptr;
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gp_config::assertion(reserve(oth.size()), "could not reserve space on building");
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sz = oth.size();
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cap = oth.size();
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auto it_l = begin();
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auto it_o = oth.cbegin();
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for(size_t i = 0; i < sz; ++i)
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{
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new(&*(it_l++)) T(*(it_o++));
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}
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}
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/**
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* @brief Construct a new vector object by moving objects out of another vector
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*
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* @param oth
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*/
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vector(vector&& oth)
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: ary(oth.ary)
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, sz(oth.sz)
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, cap(oth.cap)
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, alloc(oth.alloc)
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{
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oth.sz = 0;
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oth.cap = 0;
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oth.ary = nullptr;
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}
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/**
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* @brief Copy assignment
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*
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* @param oth
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* @return vector& the reference to this changed vector
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*/
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vector& operator=(vector& oth)
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{
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gp_config::assertion(reserve(oth.size()), "could not reserve space on assign");
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for(size_t i = 0; i < gp::min(sz, oth.sz); ++i)
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{
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if constexpr (!std::is_trivially_destructible_v<T>) ary[i]->~T();
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new(ary+i) T(oth[i]);
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}
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if(sz < oth.sz) {
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for(size_t i = sz; i < oth.sz; ++i) {
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if constexpr (!std::is_trivially_destructible_v<T>) ary[i]->~T();
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new(ary+i) T(oth[i]);
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}
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} else if(sz > oth.sz) {
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if constexpr (!std::is_trivially_destructible_v<T>)
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for(size_t i = oth.sz; i < sz; ++i) {
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ary[i]->~T();
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}
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}
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sz = oth.sz;
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return *this;
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}
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/**
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* @brief Move assignment
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*
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* Will not change the allocator of the local vector, is EXPENSIVE if the both vectors have different allocators
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*
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* @param oth
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* @return vector&
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*/
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vector& operator=(vector&& oth)
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{
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if(&alloc.get() == &oth.alloc.get())
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{
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gp::swap(ary, oth.ary);
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gp::swap(sz, oth.sz);
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gp::swap(cap, oth.cap);
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} else {
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for(auto& elem : *this) {
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elem->~T();
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}
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sz = 0;
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if(capacity()<oth.size()) {
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reserve(oth.size());
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}
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size_t idx = 0;
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for(auto& elem : oth) {
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new(ary+idx) T(gp::move(elem));
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++idx;
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elem.~T();
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}
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gp_config::assertion(alloc.get().deallocate(oth.ary), "could not deallocate");
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sz = idx;
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oth.sz = 0;
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oth.capacity = 0;
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oth.ary = nullptr;
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}
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return *this;
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}
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constexpr T& operator[] (size_t off)
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{
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if constexpr (gp_config::has_buffer_bounds)
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{
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gp_config::assertion(
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off < sz,
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"Array bounds infringed"
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);
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}
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return ary[off];
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}
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~vector()
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{
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if(ary)
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{
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if constexpr (!std::is_trivially_destructible_v<T>)
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for(auto& elem : *this) {
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elem.~T();
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}
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gp_config::assertion(alloc.get().deallocate(ary), "could not deallocate");
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}
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}
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/**
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* @brief Ensures the vector can hold at least 1 more element
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*
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* @return true if it is at least now possible to fit one more element
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* @return false if fiting one more element is not possible even now
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*/
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bool grow() {
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if(sz == cap) return reserve(1 + sz + (sz >> 1));
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return true;
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}
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/**
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* @brief Reserves space so that the capacity is at least equal to the provided value.
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*
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* This will never shrink the datastructure
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*
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* @param new_cap the new capacity
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* @return true on success
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* @return false on failure
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*/
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bool reserve(size_t new_cap) {
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if(new_cap <= cap) return true;
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size_t new_data_size = new_cap*sizeof(T);
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if(alloc.get().try_reallocate(ary, new_data_size)) return true;
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if(T* new_ary = (T*)alloc.get().allocate(new_data_size); new_ary) {
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auto new_it = new_ary;
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for(auto& elem : *this) {
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new(new_it++) T(gp::move(elem));
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}
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if(ary != nullptr) gp_config::assertion(alloc.get().deallocate(ary), "failed to deallocate old range");
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ary = new_ary;
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cap = new_cap;
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return true;
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}
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return false;
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}
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constexpr const T& operator[] (size_t off) const
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{
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if constexpr (gp_config::has_buffer_bounds)
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{
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gp_config::assertion(
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off < sz,
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"Array bounds infringed"
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);
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}
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return ary[off];
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}
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constexpr size_t size() const
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{
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return sz;
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}
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constexpr size_t capacity() const
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{
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return cap;
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}
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/**
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* @brief Adds the provided value to the vector
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*
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* @param value
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* @return true on success
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* @return false on failure
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*/
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constexpr bool push_back(T& value) {
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if(grow()) {
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new(ary+sz) T(value);
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sz++;
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return true;
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}
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return false;
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}
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/**
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* @brief Moves the provided value to the vector
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*
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* @param value
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* @return true on success
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* @return false on failure
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*/
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constexpr bool push_back(T&& value) {
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if(grow()) {
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new(ary+sz) T(gp::move(value));
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sz++;
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return true;
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}
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return false;
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}
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/**
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* @brief Constructs a new element at the end of the vector
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*
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* @param value the parameters to be sent to the constructor of T
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* @return true on success
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* @return false on failure
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*/
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template<typename ...U>
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constexpr bool emplace_back(U&&... value) {
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if(grow()) {
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new(ary+sz) T(gp::forward<U>(value)...);
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sz++;
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return true;
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}
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return false;
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}
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/**
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* @brief moves the last element of the vector out if it exists, returning an optional.
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*
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* @return constexpr gp::optional<T> contains a value if it existed, else it is empty
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*/
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constexpr gp::optional<T> pop_back() {
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if(sz == 0) return gp::nullopt;
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sz--;
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gp::optional<T> ret_val = gp::move(ary[sz]);
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ary[sz]->~T();
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return gp::move(ret_val);
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}
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void remove(pointer_iterator<T, 1> it) {
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for(auto step = it + 1; step<end(); step++) {
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(*it++) = gp::move(*step);
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}
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*rbegin().~T();
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sz -= 1;
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}
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constexpr pointer_iterator<T, 1> begin()
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{
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return associated_iterator(&ary[0]);
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}
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constexpr pointer_iterator<T, 1> end()
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{
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return associated_iterator(&ary[sz]);
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}
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constexpr const_pointer_iterator<T, 1> cbegin() const
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{
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return associated_const_iterator(&ary[0]);
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}
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constexpr const_pointer_iterator<T, 1> cend() const
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{
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return associated_const_iterator(&ary[sz]);
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}
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constexpr pointer_iterator<T, -1> rbegin()
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{
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return associated_riterator(&ary[sz-1]);
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}
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constexpr pointer_iterator<T, -1> rend()
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{
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return associated_riterator(ary-1);
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}
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constexpr const_pointer_iterator<T, -1> crbegin() const
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{
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return associated_const_riterator(&ary[sz-1]);
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}
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constexpr const_pointer_iterator<T, -1> crend() const
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{
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return associated_const_riterator(ary-1);
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}
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constexpr bool operator==(const vector& oth) const
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{
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for(size_t idx = 0; idx<sz; idx++)
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{
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if(ary[idx] != oth.ary[idx])
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{
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return false;
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}
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}
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return true;
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}
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constexpr bool operator!=(const vector& oth) const
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{
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return !(*this == oth);
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}
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/**
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* @brief Provides a span access to the vector
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*
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* @return A buffer of the vector.
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* It is invalidated by any operation that may change the size of the vector.
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*/
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gp::buffer<T> as_buffer()
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{
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return gp::buffer<T>{(T*)ary, (T*)ary+sz};
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}
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};
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}
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