#include <bits/concept_check.h>
-namespace _GLIBCXX_STD
-{
+_GLIBCXX_BEGIN_NESTED_NAMESPACE(std, _GLIBCXX_STD)
+
// Forward declarations of operators < and ==, needed for friend declaration.
template<class _Key, class _Compare = std::less<_Key>,
class _Alloc = std::allocator<_Key> >
swap(set<_Key, _Compare, _Alloc>& __x, set<_Key, _Compare, _Alloc>& __y)
{ __x.swap(__y); }
-} // namespace std
+_GLIBCXX_END_NESTED_NAMESPACE
#endif /* _SET_H */