Method apply_visitor

src/ifcparse/variantarray.h:241–248

    template<typename Visitor>
    auto apply_visitor(Visitor&& visitor, std::size_t index) const {
        if (index >= size()) {
            throw IfcParse::IfcException(
                "Index " + std::to_string(index) + " is out of range for variant of size " + std::to_string(size())
            );
        }
        return apply_visitor_impl(std::forward<Visitor>(visitor), index, std::integral_constant<std::size_t, sizeof...(Types)>{});
    }

    size_t size() const {
        return size_and_indices_ ? size_and_indices_[0] : 0;