e6d77c593d
Many of our basic data structures are trivially movable using memcpy() even if they are not trivially constructable, destructable or copyable. It's worth taking advantage of this *ahem* trait. Adding trivial_move_trait to String16 reduces appt running time on frameworks/base/core/res by 40%! Change-Id: I630a1a027e2d0ded96856e4ca042ea82906289fe
425 lines
14 KiB
C++
425 lines
14 KiB
C++
/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_VECTOR_H
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#define ANDROID_VECTOR_H
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#include <new>
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Log.h>
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#include <utils/VectorImpl.h>
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#include <utils/TypeHelpers.h>
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// ---------------------------------------------------------------------------
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namespace android {
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template <typename TYPE>
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class SortedVector;
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/*!
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* The main templated vector class ensuring type safety
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* while making use of VectorImpl.
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* This is the class users want to use.
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*/
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template <class TYPE>
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class Vector : private VectorImpl
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{
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public:
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typedef TYPE value_type;
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/*!
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* Constructors and destructors
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*/
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Vector();
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Vector(const Vector<TYPE>& rhs);
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explicit Vector(const SortedVector<TYPE>& rhs);
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virtual ~Vector();
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/*! copy operator */
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const Vector<TYPE>& operator = (const Vector<TYPE>& rhs) const;
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Vector<TYPE>& operator = (const Vector<TYPE>& rhs);
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const Vector<TYPE>& operator = (const SortedVector<TYPE>& rhs) const;
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Vector<TYPE>& operator = (const SortedVector<TYPE>& rhs);
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/*
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* empty the vector
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*/
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inline void clear() { VectorImpl::clear(); }
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/*!
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* vector stats
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*/
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//! returns number of items in the vector
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inline size_t size() const { return VectorImpl::size(); }
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//! returns wether or not the vector is empty
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inline bool isEmpty() const { return VectorImpl::isEmpty(); }
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//! returns how many items can be stored without reallocating the backing store
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inline size_t capacity() const { return VectorImpl::capacity(); }
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//! setst the capacity. capacity can never be reduced less than size()
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inline ssize_t setCapacity(size_t size) { return VectorImpl::setCapacity(size); }
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/*!
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* C-style array access
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*/
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//! read-only C-style access
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inline const TYPE* array() const;
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//! read-write C-style access
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TYPE* editArray();
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/*!
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* accessors
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*/
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//! read-only access to an item at a given index
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inline const TYPE& operator [] (size_t index) const;
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//! alternate name for operator []
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inline const TYPE& itemAt(size_t index) const;
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//! stack-usage of the vector. returns the top of the stack (last element)
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const TYPE& top() const;
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//! same as operator [], but allows to access the vector backward (from the end) with a negative index
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const TYPE& mirrorItemAt(ssize_t index) const;
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/*!
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* modifing the array
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*/
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//! copy-on write support, grants write access to an item
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TYPE& editItemAt(size_t index);
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//! grants right acces to the top of the stack (last element)
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TYPE& editTop();
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/*!
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* append/insert another vector
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*/
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//! insert another vector at a given index
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ssize_t insertVectorAt(const Vector<TYPE>& vector, size_t index);
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//! append another vector at the end of this one
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ssize_t appendVector(const Vector<TYPE>& vector);
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//! insert an array at a given index
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ssize_t insertArrayAt(const TYPE* array, size_t index, size_t length);
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//! append an array at the end of this vector
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ssize_t appendArray(const TYPE* array, size_t length);
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/*!
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* add/insert/replace items
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*/
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//! insert one or several items initialized with their default constructor
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inline ssize_t insertAt(size_t index, size_t numItems = 1);
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//! insert one or several items initialized from a prototype item
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ssize_t insertAt(const TYPE& prototype_item, size_t index, size_t numItems = 1);
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//! pop the top of the stack (removes the last element). No-op if the stack's empty
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inline void pop();
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//! pushes an item initialized with its default constructor
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inline void push();
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//! pushes an item on the top of the stack
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void push(const TYPE& item);
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//! same as push() but returns the index the item was added at (or an error)
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inline ssize_t add();
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//! same as push() but returns the index the item was added at (or an error)
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ssize_t add(const TYPE& item);
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//! replace an item with a new one initialized with its default constructor
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inline ssize_t replaceAt(size_t index);
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//! replace an item with a new one
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ssize_t replaceAt(const TYPE& item, size_t index);
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/*!
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* remove items
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*/
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//! remove several items
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inline ssize_t removeItemsAt(size_t index, size_t count = 1);
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//! remove one item
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inline ssize_t removeAt(size_t index) { return removeItemsAt(index); }
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/*!
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* sort (stable) the array
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*/
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typedef int (*compar_t)(const TYPE* lhs, const TYPE* rhs);
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typedef int (*compar_r_t)(const TYPE* lhs, const TYPE* rhs, void* state);
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inline status_t sort(compar_t cmp);
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inline status_t sort(compar_r_t cmp, void* state);
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// for debugging only
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inline size_t getItemSize() const { return itemSize(); }
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/*
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* these inlines add some level of compatibility with STL. eventually
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* we should probably turn things around.
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*/
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typedef TYPE* iterator;
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typedef TYPE const* const_iterator;
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inline iterator begin() { return editArray(); }
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inline iterator end() { return editArray() + size(); }
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inline const_iterator begin() const { return array(); }
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inline const_iterator end() const { return array() + size(); }
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inline void reserve(size_t n) { setCapacity(n); }
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inline bool empty() const{ return isEmpty(); }
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inline void push_back(const TYPE& item) { insertAt(item, size(), 1); }
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inline void push_front(const TYPE& item) { insertAt(item, 0, 1); }
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inline iterator erase(iterator pos) {
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return begin() + removeItemsAt(pos-array());
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}
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protected:
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virtual void do_construct(void* storage, size_t num) const;
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virtual void do_destroy(void* storage, size_t num) const;
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virtual void do_copy(void* dest, const void* from, size_t num) const;
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virtual void do_splat(void* dest, const void* item, size_t num) const;
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virtual void do_move_forward(void* dest, const void* from, size_t num) const;
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virtual void do_move_backward(void* dest, const void* from, size_t num) const;
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};
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// Vector<T> can be trivially moved using memcpy() because moving does not
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// require any change to the underlying SharedBuffer contents or reference count.
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template<typename T> struct trait_trivial_move<Vector<T> > { enum { value = true }; };
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// ---------------------------------------------------------------------------
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// No user serviceable parts from here...
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// ---------------------------------------------------------------------------
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template<class TYPE> inline
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Vector<TYPE>::Vector()
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: VectorImpl(sizeof(TYPE),
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((traits<TYPE>::has_trivial_ctor ? HAS_TRIVIAL_CTOR : 0)
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|(traits<TYPE>::has_trivial_dtor ? HAS_TRIVIAL_DTOR : 0)
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|(traits<TYPE>::has_trivial_copy ? HAS_TRIVIAL_COPY : 0))
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)
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{
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}
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template<class TYPE> inline
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Vector<TYPE>::Vector(const Vector<TYPE>& rhs)
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: VectorImpl(rhs) {
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}
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template<class TYPE> inline
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Vector<TYPE>::Vector(const SortedVector<TYPE>& rhs)
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: VectorImpl(static_cast<const VectorImpl&>(rhs)) {
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}
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template<class TYPE> inline
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Vector<TYPE>::~Vector() {
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finish_vector();
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}
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template<class TYPE> inline
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Vector<TYPE>& Vector<TYPE>::operator = (const Vector<TYPE>& rhs) {
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VectorImpl::operator = (rhs);
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return *this;
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}
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template<class TYPE> inline
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const Vector<TYPE>& Vector<TYPE>::operator = (const Vector<TYPE>& rhs) const {
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VectorImpl::operator = (static_cast<const VectorImpl&>(rhs));
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return *this;
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}
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template<class TYPE> inline
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Vector<TYPE>& Vector<TYPE>::operator = (const SortedVector<TYPE>& rhs) {
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VectorImpl::operator = (static_cast<const VectorImpl&>(rhs));
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return *this;
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}
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template<class TYPE> inline
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const Vector<TYPE>& Vector<TYPE>::operator = (const SortedVector<TYPE>& rhs) const {
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VectorImpl::operator = (rhs);
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return *this;
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}
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template<class TYPE> inline
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const TYPE* Vector<TYPE>::array() const {
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return static_cast<const TYPE *>(arrayImpl());
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}
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template<class TYPE> inline
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TYPE* Vector<TYPE>::editArray() {
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return static_cast<TYPE *>(editArrayImpl());
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}
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template<class TYPE> inline
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const TYPE& Vector<TYPE>::operator[](size_t index) const {
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LOG_FATAL_IF( index>=size(),
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"itemAt: index %d is past size %d", (int)index, (int)size() );
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return *(array() + index);
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}
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template<class TYPE> inline
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const TYPE& Vector<TYPE>::itemAt(size_t index) const {
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return operator[](index);
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}
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template<class TYPE> inline
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const TYPE& Vector<TYPE>::mirrorItemAt(ssize_t index) const {
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LOG_FATAL_IF( (index>0 ? index : -index)>=size(),
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"mirrorItemAt: index %d is past size %d",
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(int)index, (int)size() );
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return *(array() + ((index<0) ? (size()-index) : index));
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}
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template<class TYPE> inline
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const TYPE& Vector<TYPE>::top() const {
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return *(array() + size() - 1);
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}
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template<class TYPE> inline
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TYPE& Vector<TYPE>::editItemAt(size_t index) {
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return *( static_cast<TYPE *>(editItemLocation(index)) );
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}
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template<class TYPE> inline
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TYPE& Vector<TYPE>::editTop() {
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return *( static_cast<TYPE *>(editItemLocation(size()-1)) );
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::insertVectorAt(const Vector<TYPE>& vector, size_t index) {
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return VectorImpl::insertVectorAt(reinterpret_cast<const VectorImpl&>(vector), index);
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::appendVector(const Vector<TYPE>& vector) {
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return VectorImpl::appendVector(reinterpret_cast<const VectorImpl&>(vector));
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::insertArrayAt(const TYPE* array, size_t index, size_t length) {
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return VectorImpl::insertArrayAt(array, index, length);
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::appendArray(const TYPE* array, size_t length) {
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return VectorImpl::appendArray(array, length);
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::insertAt(const TYPE& item, size_t index, size_t numItems) {
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return VectorImpl::insertAt(&item, index, numItems);
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}
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template<class TYPE> inline
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void Vector<TYPE>::push(const TYPE& item) {
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return VectorImpl::push(&item);
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::add(const TYPE& item) {
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return VectorImpl::add(&item);
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::replaceAt(const TYPE& item, size_t index) {
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return VectorImpl::replaceAt(&item, index);
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::insertAt(size_t index, size_t numItems) {
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return VectorImpl::insertAt(index, numItems);
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}
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template<class TYPE> inline
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void Vector<TYPE>::pop() {
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VectorImpl::pop();
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}
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template<class TYPE> inline
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void Vector<TYPE>::push() {
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VectorImpl::push();
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::add() {
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return VectorImpl::add();
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::replaceAt(size_t index) {
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return VectorImpl::replaceAt(index);
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}
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template<class TYPE> inline
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ssize_t Vector<TYPE>::removeItemsAt(size_t index, size_t count) {
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return VectorImpl::removeItemsAt(index, count);
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}
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template<class TYPE> inline
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status_t Vector<TYPE>::sort(Vector<TYPE>::compar_t cmp) {
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return VectorImpl::sort((VectorImpl::compar_t)cmp);
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}
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template<class TYPE> inline
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status_t Vector<TYPE>::sort(Vector<TYPE>::compar_r_t cmp, void* state) {
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return VectorImpl::sort((VectorImpl::compar_r_t)cmp, state);
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}
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// ---------------------------------------------------------------------------
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template<class TYPE>
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void Vector<TYPE>::do_construct(void* storage, size_t num) const {
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construct_type( reinterpret_cast<TYPE*>(storage), num );
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}
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template<class TYPE>
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void Vector<TYPE>::do_destroy(void* storage, size_t num) const {
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destroy_type( reinterpret_cast<TYPE*>(storage), num );
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}
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template<class TYPE>
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void Vector<TYPE>::do_copy(void* dest, const void* from, size_t num) const {
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copy_type( reinterpret_cast<TYPE*>(dest), reinterpret_cast<const TYPE*>(from), num );
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}
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template<class TYPE>
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void Vector<TYPE>::do_splat(void* dest, const void* item, size_t num) const {
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splat_type( reinterpret_cast<TYPE*>(dest), reinterpret_cast<const TYPE*>(item), num );
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}
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template<class TYPE>
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void Vector<TYPE>::do_move_forward(void* dest, const void* from, size_t num) const {
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move_forward_type( reinterpret_cast<TYPE*>(dest), reinterpret_cast<const TYPE*>(from), num );
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}
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template<class TYPE>
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void Vector<TYPE>::do_move_backward(void* dest, const void* from, size_t num) const {
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move_backward_type( reinterpret_cast<TYPE*>(dest), reinterpret_cast<const TYPE*>(from), num );
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}
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}; // namespace android
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// ---------------------------------------------------------------------------
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#endif // ANDROID_VECTOR_H
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