See api at api.md

class Settings{
    Epoch epoch;
public:
    void set_resolution(){
        epoch++;
    }
    void set_gamma(){
        epoch++;
    }
    void set_anything(){
        epoch++;
    }

    Epoch get_epoch() const{
        return epoch;
    }
};


Settings settings;


// each 5 min check for settings changed, if yes - save
Epoch settings_autosave_epoch;
if (settings_autosave_epoch.update(settings.get_epoch())){
    save();
}

---

Pay attention on setters.

with dirty-flags

with Epochs

class Triangle{ bool ab_dirty = true; bool ac_dirty = true; bool bc_dirty = true; Point a,b,c; float m_ab, m_bc, m_ac; float calculate_ab(); float calculate_bc(); float calculate_ac(); public: void set_a(Point point){ a = point; ab_dirty = true; ac_dirty = true; } void set_b(Point point){ b = point; ab_dirty = true; bc_dirty = true; } void set_c(Point point){ c = point; ac_dirty = true; bc_dirty = true; } float ab(){ if (ab_dirty){ ab_dirty = false; m_ab = calculate_ab(); } return m_ab; } float bc(); float ac(); };

class Triangle{ Epoch a_epoch, b_epoch, c_epoch; Point a,b,c; EpochTuple ab_epoch, ac_epoch, bc_epoch; float m_ab, m_bc, m_ac; float calculate_ab(); float calculate_bc(); float calculate_ac(); public: void set_a(Point point){ a = point; a_epoch++; } void set_b(Point point){ b = point; b_epoch++; } void set_c(Point point){ c = point; c_epoch++; } float ab(){ if (ab_epoch.update(a_epoch, b_epoch)){ m_ab = calculate_ab(); } return m_ab; } float bc(); float ac(); };

---

with dirty-flags

with Epochs

class SettingsWindow{ bool save_dirty = false; bool canvas_dirty = false; void rise_dirty_flags(){ // O(n) save_dirty = true; canvas_dirty = true; } public: void set_resolution(){ rise_dirty_flags(); } void set_gamma(){ rise_dirty_flags(); } void set_anything(){ rise_dirty_flags(); } void draw(){ if (canvas_dirty){ canvas_dirty = false; redraw_canvas(); } } void SaveClk(){ if (save_dirty){ save_dirty = false; save(); } } };

class SettingsWindow{ Epoch epoch; Epoch save_epoch; Epoch canvas_update_epoch; public: void set_resolution(){ epoch++; } void set_gamma(){ epoch++; } void set_anything(){ epoch++; } void draw(){ if (canvas_update_epoch.update(epoch)){ redraw_canvas(); } } void SaveClk(){ if (save_epoch.update(epoch)){ save(); } } };