add missing include (#1126)

The header file uses `std::declval`, so it needs to `#include <utility>`.
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Werner Henze 2023-07-04 02:20:50 +02:00 committed by GitHub
parent 87e21400dc
commit 167c77d28e
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@ -24,6 +24,7 @@
#include <memory> // for shared_ptr, unique_ptr
#include <system_error> // for hash
#include <type_traits> // for enable_if_t, is_convertible, is_assignable
#include <utility> // for declval
#if !defined(GSL_NO_IOSTREAMS)
#include <iosfwd> // for ostream