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b80114213d
By separating them from unrelated code, their dependents can use them without depending on unrelated code, which in turn helps to reduce cyclic dependencies.
297 lines
11 KiB
C++
297 lines
11 KiB
C++
/* Copyright (C) 2013
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* swift project Community / Contributors
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*
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* This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
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* directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
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* or distributed except according to the terms contained in the LICENSE file.
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*/
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//! \file
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#ifndef BLACKMISC_COLLECTION_H
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#define BLACKMISC_COLLECTION_H
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#include "blackmisc/containerbase.h"
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#include "blackmisc/mixin/mixindatastream.h"
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#include "blackmisc/mixin/mixinicon.h"
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#include <QMap>
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#include <algorithm>
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#include <type_traits>
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#include <typeindex>
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#include <iterator>
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#include <utility>
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#include <initializer_list>
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namespace BlackMisc
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{
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/*!
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* Needed for compatibility with C++ standard algorithms which expect ordered sets.
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*/
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template <class T>
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class QOrderedSet : public QMap<T, T>
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{
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public:
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//! Type of values stored in the set.
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using value_type = T;
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//! Insert a new value into the set.
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typename QMap<T, T>::iterator insert(const T &value) { return QMap<T, T>::insert(value, value); }
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//! Default constructor.
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QOrderedSet() {}
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//! Initializer list constructor.
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QOrderedSet(std::initializer_list<T> il) { for (const auto &v : il) { insert(v); } }
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//! Constructor from QList
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QOrderedSet(const QList<T> &list) { for (const auto &v : list) { insert(v); }}
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};
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/*!
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* Generic ordered container with value semantics.
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* \tparam T the type of elements contained.
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*/
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template <class T>
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class CCollection :
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public CContainerBase<CCollection<T>>,
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public Mixin::DataStreamOperators<CCollection<T>>,
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public Mixin::Icon<CCollection<T>>
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{
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public:
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//! STL compatibility
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//! @{
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typedef T key_type;
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typedef T value_type;
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typedef T &reference;
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typedef const T &const_reference;
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typedef T *pointer;
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typedef const T *const_pointer;
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typedef typename QOrderedSet<T>::const_iterator const_iterator;
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typedef const_iterator iterator; // can't modify elements in-place
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typedef ptrdiff_t difference_type;
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typedef int size_type;
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//! @}
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//! Default constructor.
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CCollection() {}
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//! Initializer list constructor.
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CCollection(std::initializer_list<T> il) : m_impl(il) {}
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//! Copy constructor.
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CCollection(const CCollection &other) = default;
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//! Constructor from QList.
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CCollection(const QList<T> &list) : m_impl(list) {}
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//! Move constructor.
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CCollection(CCollection &&other) = default;
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//! Copy assignment.
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CCollection &operator =(const CCollection &other) = default;
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//! Move assignment.
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CCollection &operator =(CCollection &&other) = default;
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//! Destructor.
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~CCollection() = default;
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//! Returns iterator at the beginning of the collection.
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iterator begin() { return m_impl.begin(); }
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//! Returns iterator at the beginning of the collection.
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const_iterator begin() const { return m_impl.begin(); }
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//! Returns iterator at the beginning of the collection.
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const_iterator cbegin() const { return m_impl.cbegin(); }
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//! Returns iterator one past the end of the collection.
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iterator end() { return m_impl.end(); }
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//! Returns const iterator one past the end of the collection.
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const_iterator end() const { return m_impl.end(); }
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//! Returns const iterator one past the end of the collection.
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const_iterator cend() const { return m_impl.cend(); }
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//! Swap this collection with another.
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void swap(CCollection &other) noexcept { m_impl.swap(other.m_impl); }
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//! Returns number of elements in the collection.
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size_type size() const { return m_impl.size(); }
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//! Returns true if the collection is empty.
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bool empty() const { return m_impl.isEmpty(); }
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//! Synonym for empty.
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bool isEmpty() const { return empty(); }
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//! Removes all elements in the collection.
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void clear() { m_impl.clear(); }
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//! For compatibility with std::inserter.
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//! \param hint Ignored.
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//! \param value The value to insert.
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iterator insert(const_iterator hint, const T &value) { Q_UNUSED(hint); return insert(value); }
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//! For compatibility with std::inserter.
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//! \param hint Ignored.
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//! \param value The value to move in.
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iterator insert(const_iterator hint, T &&value) { Q_UNUSED(hint); return insert(std::move(value)); }
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//! Inserts an element into the collection.
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//! \return An iterator to the position where value was inserted.
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iterator insert(const T &value) { return m_impl.insert(value); }
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//! Moves an element into the collection.
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//! \return An iterator to the position where value was inserted.
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iterator insert(T &&value) { return m_impl.insert(std::move(value)); }
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//! Inserts all elements from another collection into this collection.
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void insert(const CCollection &other) { std::copy(other.begin(), other.end(), std::inserter(*this, begin())); }
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//! Inserts all elements from another collection into this collection.
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//! This version moves elements instead of copying.
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void insert(CCollection &&other) { std::move(other.begin(), other.end(), std::inserter(*this, begin())); }
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//! Appends all elements from a range at the end of this collection.
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template <typename I>
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void insert(const CRange<I> &range) { std::copy(range.begin(), range.end(), std::back_inserter(*this)); }
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//! Synonym for insert.
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//! \return An iterator to the position where value was inserted.
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iterator push_back(const T &value) { return insert(value); }
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//! Synonym for insert.
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//! \return An iterator to the position where value was inserted.
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iterator push_back(T &&value) { return insert(std::move(value)); }
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//! Synonym for insert.
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void push_back(const CCollection &other) { insert(other); }
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//! Synonym for insert.
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void push_back(CCollection &&other) { insert(std::move(other)); }
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//! Synonym for insert.
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template <typename I>
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void push_back(const CRange<I> &range) { std::copy(range.begin(), range.end(), std::back_inserter(*this)); }
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//! Returns a collection which is the union of this collection and another container.
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template <class C>
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CCollection makeUnion(const C &other) const
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{
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CCollection result;
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std::set_union(begin(), end(), other.begin(), other.end(), std::inserter(result, result.begin()));
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return result;
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}
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//! Returns a collection which is the intersection of this collection and another.
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template <class C>
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CCollection intersection(const C &other) const
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{
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CCollection result;
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std::set_intersection(begin(), end(), other.begin(), other.end(), std::inserter(result, result.begin()));
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return result;
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}
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//! Returns a collection which contains all the elements from this collection which are not in the other collection.
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template <class C>
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CCollection difference(const C &other) const
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{
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CCollection result;
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std::set_difference(begin(), end(), other.begin(), other.end(), std::inserter(result, result.begin()));
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return result;
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}
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//! Remove the element pointed to by the given iterator.
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//! \return An iterator to the position of the next element after the one removed.
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//! \fixme Relying on implementation detail of QMap to reinterpret_cast to the necessary iterator type.
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iterator erase(iterator pos)
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{
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return m_impl.erase(const_cast<QMapNode<T, T> *&>(reinterpret_cast<const QMapNode<T, T> *&>(pos)));
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}
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//! Remove the range of elements between two iterators.
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//! \return An iterator to the position of the next element after the one removed.
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//! \fixme Relying on implementation detail of QMap to reinterpret_cast to the necessary iterator type.
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iterator erase(iterator it1, iterator it2)
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{
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while (it1 != it2) { it1 = erase(it1); }
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return it1;
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}
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//! Efficient find method using the find of the implementation container. Typically O(log n).
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//! \return An iterator to the position of the found element, or the end iterator if not found.
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iterator find(const T &value) { return m_impl.find(value); }
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//! Efficient find method using the find of the implementation container. Typically O(log n).
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//! \return An iterator to the position of the found element, or the end iterator if not found.
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const_iterator find(const T &value) const { return m_impl.find(value); }
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//! Efficient remove using the find and erase of the implementation container. Typically O(log n).
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//! \pre The sequence must be initialized.
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void remove(const T &object) { auto it = find(object); if (it != end()) { erase(it); } }
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//! Removes from this collection all of the elements of another collection.
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//! \pre This sequence must be initialized.
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void remove(const CCollection &other) { *this = CCollection(*this).difference(other); }
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//! Remove elements for which a given predicate returns true.
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//! \pre The collection must be initialized.
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//! \return The number of elements removed.
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template <class Predicate>
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int removeIf(Predicate p)
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{
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int count = 0;
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for (auto it = begin(); it != end();)
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{
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if (p(*it)) { it = erase(it); count++; }
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else { ++it; }
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}
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return count;
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}
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//! \copydoc BlackMisc::CContainerBase::removeIf
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template <class K0, class V0, class... KeysValues>
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int removeIf(K0 k0, V0 v0, KeysValues... keysValues)
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{
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// using-declaration doesn't play nicely with injected template names
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return CCollection::CContainerBase::removeIf(k0, v0, keysValues...);
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}
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//! Convert to a QList
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QList<T> toQList() const
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{
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return this->to(QList<T>());
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}
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//! \private Calls detach on the internal QMap.
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void detach() { m_impl.detach(); }
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//! Test for equality.
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friend bool operator ==(const CCollection &a, const CCollection &b) { return a.m_impl == b.m_impl; }
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//! Test for inequality.
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friend bool operator !=(const CCollection &a, const CCollection &b) { return a.m_impl != b.m_impl; }
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//! \copydoc BlackMisc::Mixin::DataStreamByMetaClass::marshalToDataStream
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void marshalToDataStream(QDataStream &stream) const { stream << m_impl; }
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//! \copydoc BlackMisc::Mixin::DataStreamByMetaClass::unmarshalFromDataStream
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void unmarshalFromDataStream(QDataStream &stream) { stream >> m_impl; }
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private:
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QOrderedSet<T> m_impl;
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};
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} //namespace BlackMisc
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Q_DECLARE_METATYPE(BlackMisc::CCollection<int>)
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Q_DECLARE_METATYPE(BlackMisc::CCollection<uint>)
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Q_DECLARE_METATYPE(BlackMisc::CCollection<qlonglong>)
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Q_DECLARE_METATYPE(BlackMisc::CCollection<qulonglong>)
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// CCollection<double> not instantiated due to it being a dumb idea because of rounding issues
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#endif // guard
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