add missing include (#1126)
commit167c77d28ed813b41d7e8936cbe47cc90f9f11ba
authorWerner Henze <34543625+beinhaerter@users.noreply.github.com>
Tue, 4 Jul 2023 00:20:50 +0000 (4 02:20 +0200)
committerGitHub <noreply@github.com>
Tue, 4 Jul 2023 00:20:50 +0000 (3 17:20 -0700)
treeb8d3db88665c878f391134ddcedc72bc0e5e0528
parent87e21400dc695e45412fb0a512c73d8d4aaa2d5b
add missing include (#1126)

The header file uses `std::declval`, so it needs to `#include <utility>`.
include/gsl/pointers