template <typename T> std::pair<IfcSchema::IfcSurfaceStyle*, T*> _get_surface_style(const IfcSchema::IfcStyledItem* si) {

#ifdef SCHEMA_HAS_IfcStyleAssignmentSelect

IfcEntityList::ptr style_assignments = si->Styles();

for (IfcEntityList::it kt = style_assignments->begin(); kt != style_assignments->end(); ++kt) {

if (!(*kt)->declaration().is(IfcSchema::IfcPresentationStyleAssignment::Class())) {

continue;

}

IfcSchema::IfcPresentationStyleAssignment* style_assignment = (IfcSchema::IfcPresentationStyleAssignment*) *kt;

#else

IfcSchema::IfcPresentationStyleAssignment::list::ptr style_assignments = si->Styles();

for (IfcSchema::IfcPresentationStyleAssignment::list::it kt = style_assignments->begin(); kt != style_assignments->end(); ++kt) {

IfcSchema::IfcPresentationStyleAssignment* style_assignment = *kt;

#endif

IfcEntityList::ptr styles = style_assignment->Styles();

for (IfcEntityList::it lt = styles->begin(); lt != styles->end(); ++lt) {

IfcUtil::IfcBaseClass* style = *lt;

if (style->declaration().is(IfcSchema::IfcSurfaceStyle::Class())) {

IfcSchema::IfcSurfaceStyle* surface_style = (IfcSchema::IfcSurfaceStyle*) style;

if (surface_style->Side() != IfcSchema::IfcSurfaceSide::IfcSurfaceSide_NEGATIVE) {

IfcEntityList::ptr styles_elements = surface_style->Styles();

for (IfcEntityList::it mt = styles_elements->begin(); mt != styles_elements->end(); ++mt) {

if ((*mt)->declaration().is(T::Class())) {

return std::make_pair(surface_style, (T*) *mt);

}

}

}

}

}

}

return std::make_pair<IfcSchema::IfcSurfaceStyle*, T*>(0,0);

}

template <typename T> std::pair<IfcSchema::IfcSurfaceStyle*, T*> get_surface_style(const IfcSchema::IfcRepresentationItem* representation_item) {

// For certain representation items, most notably boolean operands,

// a style definition might reside on one of its operands.

representation_item = find_item_carrying_style(representation_item);

if (representation_item->as<IfcSchema::IfcStyledItem>()) {

return _get_surface_style<T>(representation_item->as<IfcSchema::IfcStyledItem>());

}

IfcSchema::IfcStyledItem::list::ptr styled_items = representation_item->StyledByItem();

if (styled_items->size()) {

// StyledByItem is a SET [0:1] OF IfcStyledItem, so we return after the first IfcStyledItem:

return _get_surface_style<T>(*styled_items->begin());

}

return std::make_pair<IfcSchema::IfcSurfaceStyle*, T*>(0,0);

}