transformTuple.h

#include <cstddef>
#include <tuple>
 
namespace CesiumUtility {

template <typename Tuple, typename Func>
auto transformTuple(Tuple&& tuple, Func&& f) {
  constexpr size_t N = std::tuple_size_v<std::remove_reference_t<Tuple>>;
 
  return [&]<size_t... Is>(std::index_sequence<Is...>) {
    // Use brace-initialization to guarantee arguments are evaluated in order.
    // This is not generally guaranteed by "ordinary" function invocation. For
    // example, func(funcA(), funcB()) could have funcA() _or_ funcB() called
    // first; the order is unspecified.
    std::tuple result{
        std::forward<Func>(f)(std::get<Is>(std::forward<Tuple>(tuple)))...};
    return result;
  }
  (std::make_index_sequence<N>{});
}
 
} // namespace CesiumUtility