Method unset_attribute_value

src/ifcparse/IfcParse.cpp:2822–2825

// bool IfcParse::IfcFile::guid_map_ = true;

void IfcUtil::IfcBaseClass::unset_attribute_value(size_t index) {
    void* storage = file_ ? std::visit([](const auto& m) { return (void*)&m; }, file_->storage_) : nullptr;
    data_.set_attribute_value(storage, &declaration(), id() ? id() : identity(), index, Blank{});
}

AttributeValue IfcUtil::IfcBaseClass::get_attribute_value(size_t index) const {
    void* storage = file_ ? std::visit([](const auto& m) { return (void*)&m; }, file_->storage_) : nullptr;