P3817 composes with C++26’s _ placeholder. The result is
a complete replacement for std::tie with
std::ignore — with no library at all.
std::tie with std::ignore |
With P3817 and C++26 |
|---|---|
std::tie(x, std::ignore) = get_pair(); |
auto [using x, _] = get_pair(); |
std::tie(std::ignore, y) = get_pair(); |
auto [_, using y] = get_pair(); |
using _ is ill-formed — _ is a discard
placeholder, and cannot be the target of an assignment.