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229 lines
8.0 KiB
229 lines
8.0 KiB
/*
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* Copyright (C) 2015 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 ART_LIBARTBASE_BASE_DCHECKED_VECTOR_H_
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#define ART_LIBARTBASE_BASE_DCHECKED_VECTOR_H_
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#include <algorithm>
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#include <type_traits>
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#include <vector>
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#include <android-base/logging.h>
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namespace art {
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// Template class serving as a replacement for std::vector<> but adding
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// DCHECK()s for the subscript operator, front(), back(), pop_back(),
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// and for insert()/emplace()/erase() positions.
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//
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// Note: The element accessor at() is specified as throwing std::out_of_range
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// but we do not use exceptions, so this accessor is deliberately hidden.
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// Note: The common pattern &v[0] used to retrieve pointer to the data is not
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// valid for an empty dchecked_vector<>. Use data() to avoid checking empty().
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template <typename T, typename Alloc = std::allocator<T>>
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class dchecked_vector : private std::vector<T, Alloc> {
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private:
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// std::vector<> has a slightly different specialization for bool. We don't provide that.
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static_assert(!std::is_same<T, bool>::value, "Not implemented for bool.");
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using Base = std::vector<T, Alloc>;
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public:
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using typename Base::value_type;
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using typename Base::allocator_type;
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using typename Base::reference;
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using typename Base::const_reference;
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using typename Base::pointer;
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using typename Base::const_pointer;
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using typename Base::iterator;
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using typename Base::const_iterator;
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using typename Base::reverse_iterator;
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using typename Base::const_reverse_iterator;
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using typename Base::size_type;
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using typename Base::difference_type;
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// Construct/copy/destroy.
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dchecked_vector()
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: Base() { }
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explicit dchecked_vector(const allocator_type& alloc)
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: Base(alloc) { }
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explicit dchecked_vector(size_type n, const allocator_type& alloc = allocator_type())
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: Base(n, alloc) { }
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dchecked_vector(size_type n,
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const value_type& value,
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const allocator_type& alloc = allocator_type())
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: Base(n, value, alloc) { }
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template <typename InputIterator>
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dchecked_vector(InputIterator first,
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InputIterator last,
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const allocator_type& alloc = allocator_type())
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: Base(first, last, alloc) { }
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dchecked_vector(const dchecked_vector& src)
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: Base(src) { }
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dchecked_vector(const dchecked_vector& src, const allocator_type& alloc)
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: Base(src, alloc) { }
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dchecked_vector(dchecked_vector&& src)
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: Base(std::move(src)) { }
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dchecked_vector(dchecked_vector&& src, const allocator_type& alloc)
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: Base(std::move(src), alloc) { }
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dchecked_vector(std::initializer_list<value_type> il,
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const allocator_type& alloc = allocator_type())
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: Base(il, alloc) { }
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~dchecked_vector() = default;
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dchecked_vector& operator=(const dchecked_vector& src) {
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Base::operator=(src);
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return *this;
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}
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dchecked_vector& operator=(dchecked_vector&& src) {
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Base::operator=(std::move(src));
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return *this;
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}
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dchecked_vector& operator=(std::initializer_list<value_type> il) {
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Base::operator=(il);
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return *this;
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}
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// Iterators.
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using Base::begin;
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using Base::end;
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using Base::rbegin;
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using Base::rend;
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using Base::cbegin;
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using Base::cend;
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using Base::crbegin;
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using Base::crend;
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// Capacity.
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using Base::size;
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using Base::max_size;
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using Base::resize;
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using Base::capacity;
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using Base::empty;
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using Base::reserve;
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using Base::shrink_to_fit;
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// Element access: inherited.
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// Note: Deliberately not providing at().
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using Base::data;
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// Element access: subscript operator. Check index.
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reference operator[](size_type n) {
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DCHECK_LT(n, size());
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return Base::operator[](n);
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}
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const_reference operator[](size_type n) const {
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DCHECK_LT(n, size());
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return Base::operator[](n);
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}
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// Element access: front(), back(). Check not empty.
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reference front() { DCHECK(!empty()); return Base::front(); }
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const_reference front() const { DCHECK(!empty()); return Base::front(); }
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reference back() { DCHECK(!empty()); return Base::back(); }
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const_reference back() const { DCHECK(!empty()); return Base::back(); }
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// Modifiers: inherited.
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using Base::assign;
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using Base::push_back;
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using Base::clear;
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using Base::emplace_back;
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// Modifiers: pop_back(). Check not empty.
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void pop_back() { DCHECK(!empty()); Base::pop_back(); }
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// Modifiers: swap(). Swap only with another dchecked_vector instead of a plain vector.
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void swap(dchecked_vector& other) { Base::swap(other); }
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// Modifiers: insert(). Check position.
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iterator insert(const_iterator position, const value_type& value) {
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DCHECK(cbegin() <= position && position <= cend());
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return Base::insert(position, value);
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}
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iterator insert(const_iterator position, size_type n, const value_type& value) {
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DCHECK(cbegin() <= position && position <= cend());
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return Base::insert(position, n, value);
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}
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template <typename InputIterator>
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iterator insert(const_iterator position, InputIterator first, InputIterator last) {
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DCHECK(cbegin() <= position && position <= cend());
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return Base::insert(position, first, last);
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}
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iterator insert(const_iterator position, value_type&& value) {
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DCHECK(cbegin() <= position && position <= cend());
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return Base::insert(position, std::move(value));
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}
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iterator insert(const_iterator position, std::initializer_list<value_type> il) {
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DCHECK(cbegin() <= position && position <= cend());
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return Base::insert(position, il);
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}
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// Modifiers: erase(). Check position.
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iterator erase(const_iterator position) {
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DCHECK(cbegin() <= position && position < cend());
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return Base::erase(position);
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}
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iterator erase(const_iterator first, const_iterator last) {
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DCHECK(cbegin() <= first && first <= cend());
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DCHECK(first <= last && last <= cend());
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return Base::erase(first, last);
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}
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// Modifiers: emplace(). Check position.
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template <typename... Args>
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iterator emplace(const_iterator position, Args&&... args) {
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DCHECK(cbegin() <= position && position <= cend());
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Base::emplace(position, std::forward(args...));
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}
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// Allocator.
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using Base::get_allocator;
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};
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// Non-member swap(), found by argument-dependent lookup for an unqualified call.
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template <typename T, typename Alloc>
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void swap(dchecked_vector<T, Alloc>& lhs, dchecked_vector<T, Alloc>& rhs) {
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lhs.swap(rhs);
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}
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// Non-member relational operators.
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template <typename T, typename Alloc>
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bool operator==(const dchecked_vector<T, Alloc>& lhs, const dchecked_vector<T, Alloc>& rhs) {
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return lhs.size() == rhs.size() && std::equal(lhs.begin(), lhs.end(), rhs.begin());
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}
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template <typename T, typename Alloc>
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bool operator!=(const dchecked_vector<T, Alloc>& lhs, const dchecked_vector<T, Alloc>& rhs) {
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return !(lhs == rhs);
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}
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template <typename T, typename Alloc>
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bool operator<(const dchecked_vector<T, Alloc>& lhs, const dchecked_vector<T, Alloc>& rhs) {
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return std::lexicographical_compare(lhs.begin(), lhs.end(), rhs.begin(), rhs.end());
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}
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template <typename T, typename Alloc>
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bool operator<=(const dchecked_vector<T, Alloc>& lhs, const dchecked_vector<T, Alloc>& rhs) {
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return !(rhs < lhs);
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}
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template <typename T, typename Alloc>
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bool operator>(const dchecked_vector<T, Alloc>& lhs, const dchecked_vector<T, Alloc>& rhs) {
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return rhs < lhs;
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}
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template <typename T, typename Alloc>
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bool operator>=(const dchecked_vector<T, Alloc>& lhs, const dchecked_vector<T, Alloc>& rhs) {
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return !(lhs < rhs);
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}
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} // namespace art
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#endif // ART_LIBARTBASE_BASE_DCHECKED_VECTOR_H_
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