Function CartesianProduct

library/cpp/iterator/cartesian_product.h:112–115

//! Equivalent: for (auto& ai : a) { for (auto& bi : b) {...} }
template <typename... TContainers>
auto CartesianProduct(TContainers&&... containers) {
    return NPrivate::TCartesianMultiplier<TContainers...>::CartesianMultiply(
        std::forward<TContainers>(containers)..., std::make_index_sequence<sizeof...(TContainers)>{});
}