qsg2dasyncresult.h

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#ifndef OPENSWMM_RENDER_QSG2DASYNCRESULT_H
#define OPENSWMM_RENDER_QSG2DASYNCRESULT_H
 
#include <QtGlobal>
 
#include <utility>
 
namespace OpenSWMM::Render
{
 
template <typename T>
class Qsg2DAsyncResult
{
public:
    quint64 beginJob() { return ++m_submitted; }
 
    void invalidate()
    {
        ++m_submitted;
        m_published = 0;
        m_value     = T{};
    }
 
    bool tryPublish(quint64 generation, T &&value)
    {
        if (generation != m_submitted) return false;   // stale — dropped
        m_value     = std::move(value);
        m_published = generation;
        return true;
    }
 
    [[nodiscard]] bool upToDate() const
    {
        return m_published != 0 && m_published == m_submitted;
    }
 
    [[nodiscard]] bool hasValue() const { return m_published != 0; }
    [[nodiscard]] bool jobPending() const
    {
        return m_submitted != 0 && m_published != m_submitted;
    }
 
    [[nodiscard]] const T &value() const { return m_value; }
    [[nodiscard]] quint64 currentGeneration() const { return m_submitted; }
 
private:
    T       m_value{};
    quint64 m_submitted = 0;   
    quint64 m_published = 0;   
};
 
} // namespace OpenSWMM::Render
 
#endif // OPENSWMM_RENDER_QSG2DASYNCRESULT_H