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
287 lines
9.5 KiB
C++
287 lines
9.5 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_SORTED_VECTOR_H
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#define ANDROID_SORTED_VECTOR_H
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#include <assert.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Vector.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 <class TYPE>
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class SortedVector : private SortedVectorImpl
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{
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friend class Vector<TYPE>;
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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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SortedVector();
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SortedVector(const SortedVector<TYPE>& rhs);
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virtual ~SortedVector();
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/*! copy operator */
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const SortedVector<TYPE>& operator = (const SortedVector<TYPE>& rhs) const;
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SortedVector<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. BE VERY CAREFUL when modifying the array
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//! you ust keep it sorted! You usually don't use this function.
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TYPE* editArray();
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//! finds the index of an item
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ssize_t indexOf(const TYPE& item) const;
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//! finds where this item should be inserted
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size_t orderOf(const TYPE& item) const;
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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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//! add an item in the right place (and replace the one that is there)
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ssize_t add(const TYPE& item);
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//! editItemAt() MUST NOT change the order of this item
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TYPE& editItemAt(size_t index) {
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return *( static_cast<TYPE *>(VectorImpl::editItemLocation(index)) );
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}
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//! merges a vector into this one
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ssize_t merge(const Vector<TYPE>& vector);
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ssize_t merge(const SortedVector<TYPE>& vector);
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//! removes an item
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ssize_t remove(const TYPE&);
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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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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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virtual int do_compare(const void* lhs, const void* rhs) const;
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};
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// SortedVector<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<SortedVector<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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SortedVector<TYPE>::SortedVector()
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: SortedVectorImpl(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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SortedVector<TYPE>::SortedVector(const SortedVector<TYPE>& rhs)
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: SortedVectorImpl(rhs) {
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}
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template<class TYPE> inline
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SortedVector<TYPE>::~SortedVector() {
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finish_vector();
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}
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template<class TYPE> inline
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SortedVector<TYPE>& SortedVector<TYPE>::operator = (const SortedVector<TYPE>& rhs) {
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SortedVectorImpl::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 SortedVector<TYPE>& SortedVector<TYPE>::operator = (const SortedVector<TYPE>& rhs) const {
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SortedVectorImpl::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* SortedVector<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* SortedVector<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& SortedVector<TYPE>::operator[](size_t index) const {
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assert( index<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& SortedVector<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& SortedVector<TYPE>::mirrorItemAt(ssize_t index) const {
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assert( (index>0 ? index : -index)<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& SortedVector<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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ssize_t SortedVector<TYPE>::add(const TYPE& item) {
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return SortedVectorImpl::add(&item);
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}
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template<class TYPE> inline
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ssize_t SortedVector<TYPE>::indexOf(const TYPE& item) const {
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return SortedVectorImpl::indexOf(&item);
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}
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template<class TYPE> inline
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size_t SortedVector<TYPE>::orderOf(const TYPE& item) const {
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return SortedVectorImpl::orderOf(&item);
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}
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template<class TYPE> inline
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ssize_t SortedVector<TYPE>::merge(const Vector<TYPE>& vector) {
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return SortedVectorImpl::merge(reinterpret_cast<const VectorImpl&>(vector));
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}
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template<class TYPE> inline
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ssize_t SortedVector<TYPE>::merge(const SortedVector<TYPE>& vector) {
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return SortedVectorImpl::merge(reinterpret_cast<const SortedVectorImpl&>(vector));
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}
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template<class TYPE> inline
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ssize_t SortedVector<TYPE>::remove(const TYPE& item) {
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return SortedVectorImpl::remove(&item);
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}
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template<class TYPE> inline
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ssize_t SortedVector<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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// ---------------------------------------------------------------------------
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template<class TYPE>
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void SortedVector<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 SortedVector<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 SortedVector<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 SortedVector<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 SortedVector<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 SortedVector<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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template<class TYPE>
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int SortedVector<TYPE>::do_compare(const void* lhs, const void* rhs) const {
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return compare_type( *reinterpret_cast<const TYPE*>(lhs), *reinterpret_cast<const TYPE*>(rhs) );
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}
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}; // namespace android
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// ---------------------------------------------------------------------------
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#endif // ANDROID_SORTED_VECTOR_H
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