qt-everywhere-src-5.15.1/qtdeclarative/src/particles/qquickparticleflatset_p.h

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** Copyright (C) 2020 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
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#ifndef QQUICKPARTICLEFLATSET_P_H
#define QQUICKPARTICLEFLATSET_P_H

#include <QtGlobal>

#include <vector>
#include <algorithm>
#include <iterator>

QT_BEGIN_NAMESPACE

// Minimal API, just for the consumption of Qt Quick Particles.
// For extra safety, it's in a private namespace

namespace QtQuickParticlesPrivate {

template <typename T>
class QFlatSet
{
public:
    using iterator = typename std::vector<T>::iterator;
    using const_iterator = typename std::vector<T>::const_iterator;
    using value_type = typename std::vector<T>::value_type;
    using size_type = int;

    iterator find(const T &t)
    {
        return std::find(begin(), end(), t);
    }

    const_iterator find(const T &t) const
    {
        return std::find(begin(), end(), t);
    }

    bool contains(const T &t) const
    {
        return find(t) != end();
    }

    void clear()
    {
        m_data.clear();
    }

    void reserve(int capacity)
    {
        m_data.reserve(capacity);
    }

    iterator insert(const T &t)
    {
        auto i = find(t);
        if (i != end())
            return i;
        T copy = t;
        m_data.push_back(std::move(copy));
        return std::prev(m_data.end());
    }

    iterator insert(T &&t)
    {
        auto i = find(t);
        if (i != end())
            return i;
        m_data.push_back(std::move(t));
        return std::prev(m_data.end());
    }

    size_type remove(const T &t)
    {
        auto i = std::find(m_data.begin(), m_data.end(), t);
        if (i != m_data.end()) {
            m_data.erase(i);
            return 1;
        }
        return 0;
    }

    iterator operator<<(const T &t)
    {
        return insert(t);
    }

    iterator operator<<(T &&t)
    {
        return insert(std::move(t));
    }

    iterator begin() { return m_data.begin(); }
    const_iterator begin() const { return m_data.begin(); }
    const_iterator cbegin() const { return m_data.cbegin(); }

    iterator end() { return m_data.end(); }
    const_iterator end() const { return m_data.end(); }
    const_iterator cend() const { return m_data.cend(); }

private:
    std::vector<T> m_data;
};

} // namespace QtQuickParticlesPrivate

QT_END_NAMESPACE

#endif // QQUICKPARTICLEFLATSET_P_H