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-rw-r--r--Source/kwsys/hash_set.hxx.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/kwsys/hash_set.hxx.in b/Source/kwsys/hash_set.hxx.in
index e3a0c6c44..5edd367af 100644
--- a/Source/kwsys/hash_set.hxx.in
+++ b/Source/kwsys/hash_set.hxx.in
@@ -49,7 +49,7 @@ namespace @KWSYS_NAMESPACE@ {
// identity is an extension: it is not part of the standard.
template <class _Tp>
-struct _Identity : public std::unary_function<_Tp, _Tp>
+struct _Identity
{
const _Tp& operator()(const _Tp& __x) const { return __x; }
};