244 lines
7.5 KiB
C++
244 lines
7.5 KiB
C++
// Copyright 2009-2021 Intel Corporation
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "alloc.h"
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#include <algorithm>
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namespace embree
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{
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template<typename T, typename allocator>
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class vector_t
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{
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public:
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typedef T value_type;
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typedef T* iterator;
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typedef const T* const_iterator;
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__forceinline vector_t ()
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: size_active(0), size_alloced(0), items(nullptr) {}
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__forceinline explicit vector_t (size_t sz)
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: size_active(0), size_alloced(0), items(nullptr) { internal_resize_init(sz); }
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template<typename M>
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__forceinline explicit vector_t (M alloc, size_t sz)
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: alloc(alloc), size_active(0), size_alloced(0), items(nullptr) { internal_resize_init(sz); }
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__forceinline ~vector_t() {
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clear();
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}
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__forceinline vector_t (const vector_t& other)
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{
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size_active = other.size_active;
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size_alloced = other.size_alloced;
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items = alloc.allocate(size_alloced);
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for (size_t i=0; i<size_active; i++)
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::new (&items[i]) value_type(other.items[i]);
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}
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__forceinline vector_t (vector_t&& other)
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: alloc(std::move(other.alloc))
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{
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size_active = other.size_active; other.size_active = 0;
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size_alloced = other.size_alloced; other.size_alloced = 0;
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items = other.items; other.items = nullptr;
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}
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__forceinline vector_t& operator=(const vector_t& other)
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{
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resize(other.size_active);
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for (size_t i=0; i<size_active; i++)
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items[i] = value_type(other.items[i]);
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return *this;
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}
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__forceinline vector_t& operator=(vector_t&& other)
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{
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clear();
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alloc = std::move(other.alloc);
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size_active = other.size_active; other.size_active = 0;
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size_alloced = other.size_alloced; other.size_alloced = 0;
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items = other.items; other.items = nullptr;
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return *this;
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}
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/********************** Iterators ****************************/
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__forceinline iterator begin() { return items; };
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__forceinline const_iterator begin() const { return items; };
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__forceinline iterator end () { return items+size_active; };
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__forceinline const_iterator end () const { return items+size_active; };
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/********************** Capacity ****************************/
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__forceinline bool empty () const { return size_active == 0; }
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__forceinline size_t size () const { return size_active; }
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__forceinline size_t capacity () const { return size_alloced; }
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__forceinline void resize(size_t new_size) {
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internal_resize(new_size,internal_grow_size(new_size));
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}
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__forceinline void reserve(size_t new_alloced)
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{
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/* do nothing if container already large enough */
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if (new_alloced <= size_alloced)
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return;
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/* resize exact otherwise */
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internal_resize(size_active,new_alloced);
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}
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__forceinline void shrink_to_fit() {
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internal_resize(size_active,size_active);
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}
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/******************** Element access **************************/
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__forceinline T& operator[](size_t i) { assert(i < size_active); return items[i]; }
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__forceinline const T& operator[](size_t i) const { assert(i < size_active); return items[i]; }
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__forceinline T& at(size_t i) { assert(i < size_active); return items[i]; }
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__forceinline const T& at(size_t i) const { assert(i < size_active); return items[i]; }
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__forceinline T& front() const { assert(size_active > 0); return items[0]; };
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__forceinline T& back () const { assert(size_active > 0); return items[size_active-1]; };
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__forceinline T* data() { return items; };
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__forceinline const T* data() const { return items; };
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/******************** Modifiers **************************/
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__forceinline void push_back(const T& nt)
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{
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const T v = nt; // need local copy as input reference could point to this vector
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internal_resize(size_active,internal_grow_size(size_active+1));
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::new (&items[size_active++]) T(v);
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}
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__forceinline void pop_back()
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{
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assert(!empty());
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size_active--;
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items[size_active].~T();
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}
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__forceinline void clear()
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{
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/* destroy elements */
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for (size_t i=0; i<size_active; i++){
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items[i].~T();
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}
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/* free memory */
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alloc.deallocate(items,size_alloced);
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items = nullptr;
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size_active = size_alloced = 0;
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}
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/******************** Comparisons **************************/
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friend bool operator== (const vector_t& a, const vector_t& b)
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{
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if (a.size() != b.size()) return false;
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for (size_t i=0; i<a.size(); i++)
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if (a[i] != b[i])
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return false;
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return true;
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}
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friend bool operator!= (const vector_t& a, const vector_t& b) {
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return !(a==b);
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}
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private:
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__forceinline void internal_resize_init(size_t new_active)
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{
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assert(size_active == 0);
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assert(size_alloced == 0);
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assert(items == nullptr);
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if (new_active == 0) return;
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items = alloc.allocate(new_active);
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for (size_t i=0; i<new_active; i++) ::new (&items[i]) T();
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size_active = new_active;
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size_alloced = new_active;
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}
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__forceinline void internal_resize(size_t new_active, size_t new_alloced)
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{
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assert(new_active <= new_alloced);
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/* destroy elements */
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if (new_active < size_active)
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{
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for (size_t i=new_active; i<size_active; i++){
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items[i].~T();
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}
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size_active = new_active;
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}
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/* only reallocate if necessary */
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if (new_alloced == size_alloced) {
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for (size_t i=size_active; i<new_active; i++) ::new (&items[i]) T;
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size_active = new_active;
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return;
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}
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/* reallocate and copy items */
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T* old_items = items;
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items = alloc.allocate(new_alloced);
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for (size_t i=0; i<size_active; i++) {
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::new (&items[i]) T(std::move(old_items[i]));
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old_items[i].~T();
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}
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for (size_t i=size_active; i<new_active; i++) {
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::new (&items[i]) T;
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}
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alloc.deallocate(old_items,size_alloced);
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size_active = new_active;
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size_alloced = new_alloced;
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}
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__forceinline size_t internal_grow_size(size_t new_alloced)
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{
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/* do nothing if container already large enough */
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if (new_alloced <= size_alloced)
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return size_alloced;
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/* resize to next power of 2 otherwise */
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size_t new_size_alloced = size_alloced;
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while (new_size_alloced < new_alloced) {
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new_size_alloced = std::max(size_t(1),2*new_size_alloced);
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}
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return new_size_alloced;
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}
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private:
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allocator alloc;
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size_t size_active; // number of valid items
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size_t size_alloced; // number of items allocated
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T* items; // data array
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};
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/*! vector class that performs standard allocations */
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template<typename T>
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using vector = vector_t<T,std::allocator<T>>;
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/*! vector class that performs aligned allocations */
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template<typename T>
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using avector = vector_t<T,aligned_allocator<T,std::alignment_of<T>::value> >;
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/*! vector class that performs OS allocations */
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template<typename T>
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using ovector = vector_t<T,os_allocator<T> >;
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}
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